| 1 | /* $Id: PGMPool.cpp 17586 2009-03-09 15:28:25Z vboxsync $ */
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| 2 | /** @file
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| 3 | * PGM Shadow Page Pool.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 18 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 19 | * additional information or have any questions.
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| 20 | */
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| 21 |
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| 22 | /** @page pg_pgm_pool PGM Shadow Page Pool
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| 23 | *
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| 24 | * Motivations:
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| 25 | * -# Relationship between shadow page tables and physical guest pages. This
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| 26 | * should allow us to skip most of the global flushes now following access
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| 27 | * handler changes. The main expense is flushing shadow pages.
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| 28 | * -# Limit the pool size if necessary (default is kind of limitless).
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| 29 | * -# Allocate shadow pages from RC. We use to only do this in SyncCR3.
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| 30 | * -# Required for 64-bit guests.
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| 31 | * -# Combining the PD cache and page pool in order to simplify caching.
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| 32 | *
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| 33 | *
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| 34 | * @section sec_pgm_pool_outline Design Outline
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| 35 | *
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| 36 | * The shadow page pool tracks pages used for shadowing paging structures (i.e.
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| 37 | * page tables, page directory, page directory pointer table and page map
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| 38 | * level-4). Each page in the pool has an unique identifier. This identifier is
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| 39 | * used to link a guest physical page to a shadow PT. The identifier is a
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| 40 | * non-zero value and has a relativly low max value - say 14 bits. This makes it
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| 41 | * possible to fit it into the upper bits of the of the aHCPhys entries in the
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| 42 | * ram range.
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| 43 | *
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| 44 | * By restricting host physical memory to the first 48 bits (which is the
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| 45 | * announced physical memory range of the K8L chip (scheduled for 2008)), we
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| 46 | * can safely use the upper 16 bits for shadow page ID and reference counting.
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| 47 | *
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| 48 | * Update: The 48 bit assumption will be lifted with the new physical memory
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| 49 | * management (PGMPAGE), so we won't have any trouble when someone stuffs 2TB
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| 50 | * into a box in some years.
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| 51 | *
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| 52 | * Now, it's possible for a page to be aliased, i.e. mapped by more than one PT
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| 53 | * or PD. This is solved by creating a list of physical cross reference extents
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| 54 | * when ever this happens. Each node in the list (extent) is can contain 3 page
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| 55 | * pool indexes. The list it self is chained using indexes into the paPhysExt
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| 56 | * array.
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| 57 | *
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| 58 | *
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| 59 | * @section sec_pgm_pool_life Life Cycle of a Shadow Page
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| 60 | *
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| 61 | * -# The SyncPT function requests a page from the pool.
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| 62 | * The request includes the kind of page it is (PT/PD, PAE/legacy), the
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| 63 | * address of the page it's shadowing, and more.
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| 64 | * -# The pool responds to the request by allocating a new page.
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| 65 | * When the cache is enabled, it will first check if it's in the cache.
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| 66 | * Should the pool be exhausted, one of two things can be done:
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| 67 | * -# Flush the whole pool and current CR3.
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| 68 | * -# Use the cache to find a page which can be flushed (~age).
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| 69 | * -# The SyncPT function will sync one or more pages and insert it into the
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| 70 | * shadow PD.
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| 71 | * -# The SyncPage function may sync more pages on a later \#PFs.
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| 72 | * -# The page is freed / flushed in SyncCR3 (perhaps) and some other cases.
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| 73 | * When caching is enabled, the page isn't flush but remains in the cache.
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| 74 | *
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| 75 | *
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| 76 | * @section sec_pgm_pool_impl Monitoring
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| 77 | *
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| 78 | * We always monitor PAGE_SIZE chunks of memory. When we've got multiple shadow
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| 79 | * pages for the same PAGE_SIZE of guest memory (PAE and mixed PD/PT) the pages
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| 80 | * sharing the monitor get linked using the iMonitoredNext/Prev. The head page
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| 81 | * is the pvUser to the access handlers.
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| 82 | *
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| 83 | *
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| 84 | * @section sec_pgm_pool_impl Implementation
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| 85 | *
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| 86 | * The pool will take pages from the MM page pool. The tracking data
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| 87 | * (attributes, bitmaps and so on) are allocated from the hypervisor heap. The
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| 88 | * pool content can be accessed both by using the page id and the physical
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| 89 | * address (HC). The former is managed by means of an array, the latter by an
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| 90 | * offset based AVL tree.
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| 91 | *
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| 92 | * Flushing of a pool page means that we iterate the content (we know what kind
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| 93 | * it is) and updates the link information in the ram range.
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| 94 | *
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| 95 | * ...
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| 96 | */
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| 97 |
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| 98 |
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| 99 | /*******************************************************************************
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| 100 | * Header Files *
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| 101 | *******************************************************************************/
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| 102 | #define LOG_GROUP LOG_GROUP_PGM_POOL
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| 103 | #include <VBox/pgm.h>
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| 104 | #include <VBox/mm.h>
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| 105 | #include "PGMInternal.h"
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| 106 | #include <VBox/vm.h>
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| 107 |
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| 108 | #include <VBox/log.h>
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| 109 | #include <VBox/err.h>
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| 110 | #include <iprt/asm.h>
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| 111 | #include <iprt/string.h>
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| 112 |
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| 113 |
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| 114 | /*******************************************************************************
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| 115 | * Internal Functions *
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| 116 | *******************************************************************************/
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| 117 | #ifdef PGMPOOL_WITH_MONITORING
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| 118 | static DECLCALLBACK(int) pgmR3PoolAccessHandler(PVM pVM, RTGCPHYS GCPhys, void *pvPhys, void *pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
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| 119 | #endif /* PGMPOOL_WITH_MONITORING */
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| 120 |
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| 121 |
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| 122 | /**
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| 123 | * Initalizes the pool
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| 124 | *
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| 125 | * @returns VBox status code.
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| 126 | * @param pVM The VM handle.
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| 127 | */
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| 128 | int pgmR3PoolInit(PVM pVM)
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| 129 | {
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| 130 | /*
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| 131 | * Query Pool config.
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| 132 | */
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| 133 | PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pVM), "/PGM/Pool");
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| 134 |
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| 135 | /** @cfgm{/PGM/Pool/MaxPages, uint16_t, #pages, 16, 0x3fff, 1024}
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| 136 | * The max size of the shadow page pool in pages. The pool will grow dynamically
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| 137 | * up to this limit.
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| 138 | */
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| 139 | uint16_t cMaxPages;
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| 140 | int rc = CFGMR3QueryU16Def(pCfg, "MaxPages", &cMaxPages, 4*_1M >> PAGE_SHIFT);
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| 141 | AssertLogRelRCReturn(rc, rc);
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| 142 | AssertLogRelMsgReturn(cMaxPages <= PGMPOOL_IDX_LAST && cMaxPages >= RT_ALIGN(PGMPOOL_IDX_FIRST, 16),
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| 143 | ("cMaxPages=%u (%#x)\n", cMaxPages, cMaxPages), VERR_INVALID_PARAMETER);
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| 144 | cMaxPages = RT_ALIGN(cMaxPages, 16);
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| 145 |
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| 146 | /** @cfgm{/PGM/Pool/MaxUsers, uint16_t, #users, MaxUsers, 32K, MaxPages*2}
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| 147 | * The max number of shadow page user tracking records. Each shadow page has
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| 148 | * zero of other shadow pages (or CR3s) that references it, or uses it if you
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| 149 | * like. The structures describing these relationships are allocated from a
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| 150 | * fixed sized pool. This configuration variable defines the pool size.
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| 151 | */
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| 152 | uint16_t cMaxUsers;
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| 153 | rc = CFGMR3QueryU16Def(pCfg, "MaxUsers", &cMaxUsers, cMaxPages * 2);
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| 154 | AssertLogRelRCReturn(rc, rc);
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| 155 | AssertLogRelMsgReturn(cMaxUsers >= cMaxPages && cMaxPages <= _32K,
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| 156 | ("cMaxUsers=%u (%#x)\n", cMaxUsers, cMaxUsers), VERR_INVALID_PARAMETER);
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| 157 |
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| 158 | /** @cfgm{/PGM/Pool/MaxPhysExts, uint16_t, #extents, 16, MaxPages * 2, MAX(MaxPages*2,0x3fff)}
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| 159 | * The max number of extents for tracking aliased guest pages.
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| 160 | */
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| 161 | uint16_t cMaxPhysExts;
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| 162 | rc = CFGMR3QueryU16Def(pCfg, "MaxPhysExts", &cMaxPhysExts, RT_MAX(cMaxPages * 2, PGMPOOL_IDX_LAST));
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| 163 | AssertLogRelRCReturn(rc, rc);
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| 164 | AssertLogRelMsgReturn(cMaxPhysExts >= 16 && cMaxPages <= PGMPOOL_IDX_LAST,
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| 165 | ("cMaxPhysExts=%u (%#x)\n", cMaxPhysExts, cMaxPhysExts), VERR_INVALID_PARAMETER);
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| 166 |
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| 167 | /** @cfgm{/PGM/Pool/ChacheEnabled, bool, true}
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| 168 | * Enables or disabling caching of shadow pages. Chaching means that we will try
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| 169 | * reuse shadow pages instead of recreating them everything SyncCR3, SyncPT or
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| 170 | * SyncPage requests one. When reusing a shadow page, we can save time
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| 171 | * reconstructing it and it's children.
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| 172 | */
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| 173 | bool fCacheEnabled;
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| 174 | rc = CFGMR3QueryBoolDef(pCfg, "CacheEnabled", &fCacheEnabled, true);
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| 175 | AssertLogRelRCReturn(rc, rc);
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| 176 |
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| 177 | Log(("pgmR3PoolInit: cMaxPages=%#RX16 cMaxUsers=%#RX16 cMaxPhysExts=%#RX16 fCacheEnable=%RTbool\n",
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| 178 | cMaxPages, cMaxUsers, cMaxPhysExts, fCacheEnabled));
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| 179 |
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| 180 | /*
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| 181 | * Allocate the data structures.
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| 182 | */
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| 183 | uint32_t cb = RT_OFFSETOF(PGMPOOL, aPages[cMaxPages]);
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| 184 | #ifdef PGMPOOL_WITH_USER_TRACKING
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| 185 | cb += cMaxUsers * sizeof(PGMPOOLUSER);
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| 186 | #endif
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| 187 | #ifdef PGMPOOL_WITH_GCPHYS_TRACKING
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| 188 | cb += cMaxPhysExts * sizeof(PGMPOOLPHYSEXT);
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| 189 | #endif
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| 190 | PPGMPOOL pPool;
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| 191 | rc = MMR3HyperAllocOnceNoRel(pVM, cb, 0, MM_TAG_PGM_POOL, (void **)&pPool);
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| 192 | if (RT_FAILURE(rc))
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| 193 | return rc;
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| 194 | pVM->pgm.s.pPoolR3 = pPool;
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| 195 | pVM->pgm.s.pPoolR0 = MMHyperR3ToR0(pVM, pPool);
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| 196 | pVM->pgm.s.pPoolRC = MMHyperR3ToRC(pVM, pPool);
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| 197 |
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| 198 | /*
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| 199 | * Initialize it.
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| 200 | */
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| 201 | pPool->pVMR3 = pVM;
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| 202 | pPool->pVMR0 = pVM->pVMR0;
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| 203 | pPool->pVMRC = pVM->pVMRC;
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| 204 | pPool->cMaxPages = cMaxPages;
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| 205 | pPool->cCurPages = PGMPOOL_IDX_FIRST;
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| 206 | #ifdef PGMPOOL_WITH_USER_TRACKING
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| 207 | pPool->iUserFreeHead = 0;
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| 208 | pPool->cMaxUsers = cMaxUsers;
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| 209 | PPGMPOOLUSER paUsers = (PPGMPOOLUSER)&pPool->aPages[pPool->cMaxPages];
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| 210 | pPool->paUsersR3 = paUsers;
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| 211 | pPool->paUsersR0 = MMHyperR3ToR0(pVM, paUsers);
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| 212 | pPool->paUsersRC = MMHyperR3ToRC(pVM, paUsers);
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| 213 | for (unsigned i = 0; i < cMaxUsers; i++)
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| 214 | {
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| 215 | paUsers[i].iNext = i + 1;
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| 216 | paUsers[i].iUser = NIL_PGMPOOL_IDX;
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| 217 | paUsers[i].iUserTable = 0xfffffffe;
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| 218 | }
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| 219 | paUsers[cMaxUsers - 1].iNext = NIL_PGMPOOL_USER_INDEX;
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| 220 | #endif
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| 221 | #ifdef PGMPOOL_WITH_GCPHYS_TRACKING
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| 222 | pPool->iPhysExtFreeHead = 0;
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| 223 | pPool->cMaxPhysExts = cMaxPhysExts;
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| 224 | PPGMPOOLPHYSEXT paPhysExts = (PPGMPOOLPHYSEXT)&paUsers[cMaxUsers];
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| 225 | pPool->paPhysExtsR3 = paPhysExts;
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| 226 | pPool->paPhysExtsR0 = MMHyperR3ToR0(pVM, paPhysExts);
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| 227 | pPool->paPhysExtsRC = MMHyperR3ToRC(pVM, paPhysExts);
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| 228 | for (unsigned i = 0; i < cMaxPhysExts; i++)
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| 229 | {
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| 230 | paPhysExts[i].iNext = i + 1;
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| 231 | paPhysExts[i].aidx[0] = NIL_PGMPOOL_IDX;
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| 232 | paPhysExts[i].aidx[1] = NIL_PGMPOOL_IDX;
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| 233 | paPhysExts[i].aidx[2] = NIL_PGMPOOL_IDX;
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| 234 | }
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| 235 | paPhysExts[cMaxPhysExts - 1].iNext = NIL_PGMPOOL_PHYSEXT_INDEX;
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| 236 | #endif
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| 237 | #ifdef PGMPOOL_WITH_CACHE
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| 238 | for (unsigned i = 0; i < RT_ELEMENTS(pPool->aiHash); i++)
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| 239 | pPool->aiHash[i] = NIL_PGMPOOL_IDX;
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| 240 | pPool->iAgeHead = NIL_PGMPOOL_IDX;
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| 241 | pPool->iAgeTail = NIL_PGMPOOL_IDX;
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| 242 | pPool->fCacheEnabled = fCacheEnabled;
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| 243 | #endif
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| 244 | #ifdef PGMPOOL_WITH_MONITORING
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| 245 | pPool->pfnAccessHandlerR3 = pgmR3PoolAccessHandler;
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| 246 | pPool->pszAccessHandler = "Guest Paging Access Handler";
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| 247 | #endif
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| 248 | pPool->HCPhysTree = 0;
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| 249 |
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| 250 | /* The NIL entry. */
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| 251 | Assert(NIL_PGMPOOL_IDX == 0);
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| 252 | pPool->aPages[NIL_PGMPOOL_IDX].enmKind = PGMPOOLKIND_INVALID;
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| 253 |
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| 254 | /* The Shadow 32-bit PD. (32 bits guest paging) */
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| 255 | pPool->aPages[PGMPOOL_IDX_PD].Core.Key = NIL_RTHCPHYS;
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| 256 | pPool->aPages[PGMPOOL_IDX_PD].GCPhys = NIL_RTGCPHYS;
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| 257 | pPool->aPages[PGMPOOL_IDX_PD].pvPageR3 = 0;
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| 258 | pPool->aPages[PGMPOOL_IDX_PD].enmKind = PGMPOOLKIND_32BIT_PD;
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| 259 | pPool->aPages[PGMPOOL_IDX_PD].idx = PGMPOOL_IDX_PD;
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| 260 |
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| 261 | /* The Shadow PDPT. */
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| 262 | pPool->aPages[PGMPOOL_IDX_PDPT].Core.Key = NIL_RTHCPHYS;
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| 263 | pPool->aPages[PGMPOOL_IDX_PDPT].GCPhys = NIL_RTGCPHYS;
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| 264 | pPool->aPages[PGMPOOL_IDX_PDPT].pvPageR3 = 0;
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| 265 | pPool->aPages[PGMPOOL_IDX_PDPT].enmKind = PGMPOOLKIND_PAE_PDPT;
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| 266 | pPool->aPages[PGMPOOL_IDX_PDPT].idx = PGMPOOL_IDX_PDPT;
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| 267 |
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| 268 | /* The Shadow AMD64 CR3. */
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| 269 | pPool->aPages[PGMPOOL_IDX_AMD64_CR3].Core.Key = NIL_RTHCPHYS;
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| 270 | pPool->aPages[PGMPOOL_IDX_AMD64_CR3].GCPhys = NIL_RTGCPHYS;
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| 271 | pPool->aPages[PGMPOOL_IDX_AMD64_CR3].pvPageR3 = 0;
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| 272 | pPool->aPages[PGMPOOL_IDX_AMD64_CR3].enmKind = PGMPOOLKIND_64BIT_PML4;
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| 273 | pPool->aPages[PGMPOOL_IDX_AMD64_CR3].idx = PGMPOOL_IDX_AMD64_CR3;
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| 274 |
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| 275 | /* The Nested Paging CR3. */
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| 276 | pPool->aPages[PGMPOOL_IDX_NESTED_ROOT].Core.Key = NIL_RTHCPHYS;
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| 277 | pPool->aPages[PGMPOOL_IDX_NESTED_ROOT].GCPhys = NIL_RTGCPHYS;
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| 278 | pPool->aPages[PGMPOOL_IDX_NESTED_ROOT].pvPageR3 = 0;
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| 279 | pPool->aPages[PGMPOOL_IDX_NESTED_ROOT].enmKind = PGMPOOLKIND_ROOT_NESTED;
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| 280 | pPool->aPages[PGMPOOL_IDX_NESTED_ROOT].idx = PGMPOOL_IDX_NESTED_ROOT;
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| 281 |
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| 282 | /*
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| 283 | * Set common stuff.
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| 284 | */
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| 285 | for (unsigned iPage = 1; iPage < PGMPOOL_IDX_FIRST; iPage++)
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| 286 | {
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| 287 | pPool->aPages[iPage].iNext = NIL_PGMPOOL_IDX;
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| 288 | #ifdef PGMPOOL_WITH_USER_TRACKING
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| 289 | pPool->aPages[iPage].iUserHead = NIL_PGMPOOL_USER_INDEX;
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| 290 | #endif
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| 291 | #ifdef PGMPOOL_WITH_MONITORING
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| 292 | pPool->aPages[iPage].iModifiedNext = NIL_PGMPOOL_IDX;
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| 293 | pPool->aPages[iPage].iModifiedPrev = NIL_PGMPOOL_IDX;
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| 294 | pPool->aPages[iPage].iMonitoredNext = NIL_PGMPOOL_IDX;
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| 295 | pPool->aPages[iPage].iMonitoredNext = NIL_PGMPOOL_IDX;
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| 296 | #endif
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| 297 | #ifdef PGMPOOL_WITH_CACHE
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| 298 | pPool->aPages[iPage].iAgeNext = NIL_PGMPOOL_IDX;
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| 299 | pPool->aPages[iPage].iAgePrev = NIL_PGMPOOL_IDX;
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| 300 | #endif
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| 301 | Assert(pPool->aPages[iPage].idx == iPage);
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| 302 | Assert(pPool->aPages[iPage].GCPhys == NIL_RTGCPHYS);
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| 303 | Assert(!pPool->aPages[iPage].fSeenNonGlobal);
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| 304 | Assert(!pPool->aPages[iPage].fMonitored);
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| 305 | Assert(!pPool->aPages[iPage].fCached);
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| 306 | Assert(!pPool->aPages[iPage].fZeroed);
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| 307 | Assert(!pPool->aPages[iPage].fReusedFlushPending);
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| 308 | }
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| 309 |
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| 310 | #ifdef VBOX_WITH_STATISTICS
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| 311 | /*
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| 312 | * Register statistics.
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| 313 | */
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| 314 | STAM_REG(pVM, &pPool->cCurPages, STAMTYPE_U16, "/PGM/Pool/cCurPages", STAMUNIT_PAGES, "Current pool size.");
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| 315 | STAM_REG(pVM, &pPool->cMaxPages, STAMTYPE_U16, "/PGM/Pool/cMaxPages", STAMUNIT_PAGES, "Max pool size.");
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| 316 | STAM_REG(pVM, &pPool->cUsedPages, STAMTYPE_U16, "/PGM/Pool/cUsedPages", STAMUNIT_PAGES, "The number of pages currently in use.");
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| 317 | STAM_REG(pVM, &pPool->cUsedPagesHigh, STAMTYPE_U16_RESET, "/PGM/Pool/cUsedPagesHigh", STAMUNIT_PAGES, "The high watermark for cUsedPages.");
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| 318 | STAM_REG(pVM, &pPool->StatAlloc, STAMTYPE_PROFILE_ADV, "/PGM/Pool/Alloc", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolAlloc.");
|
|---|
| 319 | STAM_REG(pVM, &pPool->StatClearAll, STAMTYPE_PROFILE, "/PGM/Pool/ClearAll", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolClearAll.");
|
|---|
| 320 | STAM_REG(pVM, &pPool->StatFlushAllInt, STAMTYPE_PROFILE, "/PGM/Pool/FlushAllInt", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolFlushAllInt.");
|
|---|
| 321 | STAM_REG(pVM, &pPool->StatFlushPage, STAMTYPE_PROFILE, "/PGM/Pool/FlushPage", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolFlushPage.");
|
|---|
| 322 | STAM_REG(pVM, &pPool->StatFree, STAMTYPE_PROFILE, "/PGM/Pool/Free", STAMUNIT_TICKS_PER_CALL, "Profiling of pgmPoolFree.");
|
|---|
| 323 | STAM_REG(pVM, &pPool->StatZeroPage, STAMTYPE_PROFILE, "/PGM/Pool/ZeroPage", STAMUNIT_TICKS_PER_CALL, "Profiling time spent zeroing pages. Overlaps with Alloc.");
|
|---|
| 324 | # ifdef PGMPOOL_WITH_USER_TRACKING
|
|---|
| 325 | STAM_REG(pVM, &pPool->cMaxUsers, STAMTYPE_U16, "/PGM/Pool/Track/cMaxUsers", STAMUNIT_COUNT, "Max user tracking records.");
|
|---|
| 326 | STAM_REG(pVM, &pPool->cPresent, STAMTYPE_U32, "/PGM/Pool/Track/cPresent", STAMUNIT_COUNT, "Number of present page table entries.");
|
|---|
| 327 | STAM_REG(pVM, &pPool->StatTrackDeref, STAMTYPE_PROFILE, "/PGM/Pool/Track/Deref", STAMUNIT_OCCURENCES, "Profiling of pgmPoolTrackDeref.");
|
|---|
| 328 | STAM_REG(pVM, &pPool->StatTrackFlushGCPhysPT, STAMTYPE_PROFILE, "/PGM/Pool/Track/FlushGCPhysPT", STAMUNIT_OCCURENCES, "Profiling of pgmPoolTrackFlushGCPhysPT.");
|
|---|
| 329 | STAM_REG(pVM, &pPool->StatTrackFlushGCPhysPTs, STAMTYPE_PROFILE, "/PGM/Pool/Track/FlushGCPhysPTs", STAMUNIT_OCCURENCES, "Profiling of pgmPoolTrackFlushGCPhysPTs.");
|
|---|
| 330 | STAM_REG(pVM, &pPool->StatTrackFlushGCPhysPTsSlow, STAMTYPE_PROFILE, "/PGM/Pool/Track/FlushGCPhysPTsSlow", STAMUNIT_OCCURENCES, "Profiling of pgmPoolTrackFlushGCPhysPTsSlow.");
|
|---|
| 331 | STAM_REG(pVM, &pPool->StatTrackFreeUpOneUser, STAMTYPE_COUNTER, "/PGM/Pool/Track/FreeUpOneUser", STAMUNIT_OCCURENCES, "The number of times we were out of user tracking records.");
|
|---|
| 332 | # endif
|
|---|
| 333 | # ifdef PGMPOOL_WITH_GCPHYS_TRACKING
|
|---|
| 334 | STAM_REG(pVM, &pPool->StatTrackDerefGCPhys, STAMTYPE_PROFILE, "/PGM/Pool/Track/DrefGCPhys", STAMUNIT_OCCURENCES, "Profiling deref activity related tracking GC physical pages.");
|
|---|
| 335 | STAM_REG(pVM, &pPool->StatTrackLinearRamSearches, STAMTYPE_COUNTER, "/PGM/Pool/Track/LinearRamSearches", STAMUNIT_OCCURENCES, "The number of times we had to do linear ram searches.");
|
|---|
| 336 | STAM_REG(pVM, &pPool->StamTrackPhysExtAllocFailures,STAMTYPE_COUNTER, "/PGM/Pool/Track/PhysExtAllocFailures", STAMUNIT_OCCURENCES, "The number of failing pgmPoolTrackPhysExtAlloc calls.");
|
|---|
| 337 | # endif
|
|---|
| 338 | # ifdef PGMPOOL_WITH_MONITORING
|
|---|
| 339 | STAM_REG(pVM, &pPool->StatMonitorRZ, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/RZ", STAMUNIT_TICKS_PER_CALL, "Profiling the RC/R0 access handler.");
|
|---|
| 340 | STAM_REG(pVM, &pPool->StatMonitorRZEmulateInstr, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/RZ/EmulateInstr", STAMUNIT_OCCURENCES, "Times we've failed interpreting the instruction.");
|
|---|
| 341 | STAM_REG(pVM, &pPool->StatMonitorRZFlushPage, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/RZ/FlushPage", STAMUNIT_TICKS_PER_CALL, "Profiling the pgmPoolFlushPage calls made from the RC/R0 access handler.");
|
|---|
| 342 | STAM_REG(pVM, &pPool->StatMonitorRZFork, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/RZ/Fork", STAMUNIT_OCCURENCES, "Times we've detected fork().");
|
|---|
| 343 | STAM_REG(pVM, &pPool->StatMonitorRZHandled, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/RZ/Handled", STAMUNIT_TICKS_PER_CALL, "Profiling the RC/R0 access we've handled (except REP STOSD).");
|
|---|
| 344 | STAM_REG(pVM, &pPool->StatMonitorRZIntrFailPatch1, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/RZ/IntrFailPatch1", STAMUNIT_OCCURENCES, "Times we've failed interpreting a patch code instruction.");
|
|---|
| 345 | STAM_REG(pVM, &pPool->StatMonitorRZIntrFailPatch2, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/RZ/IntrFailPatch2", STAMUNIT_OCCURENCES, "Times we've failed interpreting a patch code instruction during flushing.");
|
|---|
| 346 | STAM_REG(pVM, &pPool->StatMonitorRZRepPrefix, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/RZ/RepPrefix", STAMUNIT_OCCURENCES, "The number of times we've seen rep prefixes we can't handle.");
|
|---|
| 347 | STAM_REG(pVM, &pPool->StatMonitorRZRepStosd, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/RZ/RepStosd", STAMUNIT_TICKS_PER_CALL, "Profiling the REP STOSD cases we've handled.");
|
|---|
| 348 | STAM_REG(pVM, &pPool->StatMonitorR3, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/R3", STAMUNIT_TICKS_PER_CALL, "Profiling the R3 access handler.");
|
|---|
| 349 | STAM_REG(pVM, &pPool->StatMonitorR3EmulateInstr, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/R3/EmulateInstr", STAMUNIT_OCCURENCES, "Times we've failed interpreting the instruction.");
|
|---|
| 350 | STAM_REG(pVM, &pPool->StatMonitorR3FlushPage, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/R3/FlushPage", STAMUNIT_TICKS_PER_CALL, "Profiling the pgmPoolFlushPage calls made from the R3 access handler.");
|
|---|
| 351 | STAM_REG(pVM, &pPool->StatMonitorR3Fork, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/R3/Fork", STAMUNIT_OCCURENCES, "Times we've detected fork().");
|
|---|
| 352 | STAM_REG(pVM, &pPool->StatMonitorR3Handled, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/R3/Handled", STAMUNIT_TICKS_PER_CALL, "Profiling the R3 access we've handled (except REP STOSD).");
|
|---|
| 353 | STAM_REG(pVM, &pPool->StatMonitorR3RepPrefix, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/R3/RepPrefix", STAMUNIT_OCCURENCES, "The number of times we've seen rep prefixes we can't handle.");
|
|---|
| 354 | STAM_REG(pVM, &pPool->StatMonitorR3RepStosd, STAMTYPE_PROFILE, "/PGM/Pool/Monitor/R3/RepStosd", STAMUNIT_TICKS_PER_CALL, "Profiling the REP STOSD cases we've handled.");
|
|---|
| 355 | STAM_REG(pVM, &pPool->StatMonitorR3Async, STAMTYPE_COUNTER, "/PGM/Pool/Monitor/R3/Async", STAMUNIT_OCCURENCES, "Times we're called in an async thread and need to flush.");
|
|---|
| 356 | STAM_REG(pVM, &pPool->cModifiedPages, STAMTYPE_U16, "/PGM/Pool/Monitor/cModifiedPages", STAMUNIT_PAGES, "The current cModifiedPages value.");
|
|---|
| 357 | STAM_REG(pVM, &pPool->cModifiedPagesHigh, STAMTYPE_U16_RESET, "/PGM/Pool/Monitor/cModifiedPagesHigh", STAMUNIT_PAGES, "The high watermark for cModifiedPages.");
|
|---|
| 358 | # endif
|
|---|
| 359 | # ifdef PGMPOOL_WITH_CACHE
|
|---|
| 360 | STAM_REG(pVM, &pPool->StatCacheHits, STAMTYPE_COUNTER, "/PGM/Pool/Cache/Hits", STAMUNIT_OCCURENCES, "The number of pgmPoolAlloc calls satisfied by the cache.");
|
|---|
| 361 | STAM_REG(pVM, &pPool->StatCacheMisses, STAMTYPE_COUNTER, "/PGM/Pool/Cache/Misses", STAMUNIT_OCCURENCES, "The number of pgmPoolAlloc calls not statisfied by the cache.");
|
|---|
| 362 | STAM_REG(pVM, &pPool->StatCacheKindMismatches, STAMTYPE_COUNTER, "/PGM/Pool/Cache/KindMismatches", STAMUNIT_OCCURENCES, "The number of shadow page kind mismatches. (Better be low, preferably 0!)");
|
|---|
| 363 | STAM_REG(pVM, &pPool->StatCacheFreeUpOne, STAMTYPE_COUNTER, "/PGM/Pool/Cache/FreeUpOne", STAMUNIT_OCCURENCES, "The number of times the cache was asked to free up a page.");
|
|---|
| 364 | STAM_REG(pVM, &pPool->StatCacheCacheable, STAMTYPE_COUNTER, "/PGM/Pool/Cache/Cacheable", STAMUNIT_OCCURENCES, "The number of cacheable allocations.");
|
|---|
| 365 | STAM_REG(pVM, &pPool->StatCacheUncacheable, STAMTYPE_COUNTER, "/PGM/Pool/Cache/Uncacheable", STAMUNIT_OCCURENCES, "The number of uncacheable allocations.");
|
|---|
| 366 | # endif
|
|---|
| 367 | #endif /* VBOX_WITH_STATISTICS */
|
|---|
| 368 |
|
|---|
| 369 | return VINF_SUCCESS;
|
|---|
| 370 | }
|
|---|
| 371 |
|
|---|
| 372 |
|
|---|
| 373 | /**
|
|---|
| 374 | * Relocate the page pool data.
|
|---|
| 375 | *
|
|---|
| 376 | * @param pVM The VM handle.
|
|---|
| 377 | */
|
|---|
| 378 | void pgmR3PoolRelocate(PVM pVM)
|
|---|
| 379 | {
|
|---|
| 380 | pVM->pgm.s.pPoolRC = MMHyperR3ToRC(pVM, pVM->pgm.s.pPoolR3);
|
|---|
| 381 | pVM->pgm.s.pPoolR3->pVMRC = pVM->pVMRC;
|
|---|
| 382 | #ifdef PGMPOOL_WITH_USER_TRACKING
|
|---|
| 383 | pVM->pgm.s.pPoolR3->paUsersRC = MMHyperR3ToRC(pVM, pVM->pgm.s.pPoolR3->paUsersR3);
|
|---|
| 384 | #endif
|
|---|
| 385 | #ifdef PGMPOOL_WITH_GCPHYS_TRACKING
|
|---|
| 386 | pVM->pgm.s.pPoolR3->paPhysExtsRC = MMHyperR3ToRC(pVM, pVM->pgm.s.pPoolR3->paPhysExtsR3);
|
|---|
| 387 | #endif
|
|---|
| 388 | #ifdef PGMPOOL_WITH_MONITORING
|
|---|
| 389 | int rc = PDMR3LdrGetSymbolRC(pVM, NULL, "pgmPoolAccessHandler", &pVM->pgm.s.pPoolR3->pfnAccessHandlerRC);
|
|---|
| 390 | AssertReleaseRC(rc);
|
|---|
| 391 | /* init order hack. */
|
|---|
| 392 | if (!pVM->pgm.s.pPoolR3->pfnAccessHandlerR0)
|
|---|
| 393 | {
|
|---|
| 394 | rc = PDMR3LdrGetSymbolR0(pVM, NULL, "pgmPoolAccessHandler", &pVM->pgm.s.pPoolR3->pfnAccessHandlerR0);
|
|---|
| 395 | AssertReleaseRC(rc);
|
|---|
| 396 | }
|
|---|
| 397 | #endif
|
|---|
| 398 | }
|
|---|
| 399 |
|
|---|
| 400 |
|
|---|
| 401 | /**
|
|---|
| 402 | * Reset notification.
|
|---|
| 403 | *
|
|---|
| 404 | * This will flush the pool.
|
|---|
| 405 | * @param pVM The VM handle.
|
|---|
| 406 | */
|
|---|
| 407 | void pgmR3PoolReset(PVM pVM)
|
|---|
| 408 | {
|
|---|
| 409 | pgmPoolFlushAll(pVM);
|
|---|
| 410 | }
|
|---|
| 411 |
|
|---|
| 412 |
|
|---|
| 413 | /**
|
|---|
| 414 | * Grows the shadow page pool.
|
|---|
| 415 | *
|
|---|
| 416 | * I.e. adds more pages to it, assuming that hasn't reached cMaxPages yet.
|
|---|
| 417 | *
|
|---|
| 418 | * @returns VBox status code.
|
|---|
| 419 | * @param pVM The VM handle.
|
|---|
| 420 | */
|
|---|
| 421 | VMMR3DECL(int) PGMR3PoolGrow(PVM pVM)
|
|---|
| 422 | {
|
|---|
| 423 | PPGMPOOL pPool = pVM->pgm.s.pPoolR3;
|
|---|
| 424 | AssertReturn(pPool->cCurPages < pPool->cMaxPages, VERR_INTERNAL_ERROR);
|
|---|
| 425 |
|
|---|
| 426 | /*
|
|---|
| 427 | * How much to grow it by?
|
|---|
| 428 | */
|
|---|
| 429 | uint32_t cPages = pPool->cMaxPages - pPool->cCurPages;
|
|---|
| 430 | cPages = RT_MIN(PGMPOOL_CFG_MAX_GROW, cPages);
|
|---|
| 431 | LogFlow(("PGMR3PoolGrow: Growing the pool by %d (%#x) pages.\n", cPages, cPages));
|
|---|
| 432 |
|
|---|
| 433 | for (unsigned i = pPool->cCurPages; cPages-- > 0; i++)
|
|---|
| 434 | {
|
|---|
| 435 | PPGMPOOLPAGE pPage = &pPool->aPages[i];
|
|---|
| 436 |
|
|---|
| 437 | /* Allocate all pages in low (below 4 GB) memory as 32 bits guests need a page table root in low memory. */
|
|---|
| 438 | pPage->pvPageR3 = MMR3PageAllocLow(pVM);
|
|---|
| 439 | if (!pPage->pvPageR3)
|
|---|
| 440 | {
|
|---|
| 441 | Log(("We're out of memory!! i=%d\n", i));
|
|---|
| 442 | return i ? VINF_SUCCESS : VERR_NO_PAGE_MEMORY;
|
|---|
| 443 | }
|
|---|
| 444 | pPage->Core.Key = MMPage2Phys(pVM, pPage->pvPageR3);
|
|---|
| 445 | pPage->GCPhys = NIL_RTGCPHYS;
|
|---|
| 446 | pPage->enmKind = PGMPOOLKIND_FREE;
|
|---|
| 447 | pPage->idx = pPage - &pPool->aPages[0];
|
|---|
| 448 | LogFlow(("PGMR3PoolGrow: insert page #%#x - %RHp\n", pPage->idx, pPage->Core.Key));
|
|---|
| 449 | pPage->iNext = pPool->iFreeHead;
|
|---|
| 450 | #ifdef PGMPOOL_WITH_USER_TRACKING
|
|---|
| 451 | pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
|
|---|
| 452 | #endif
|
|---|
| 453 | #ifdef PGMPOOL_WITH_MONITORING
|
|---|
| 454 | pPage->iModifiedNext = NIL_PGMPOOL_IDX;
|
|---|
| 455 | pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
|
|---|
| 456 | pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
|
|---|
| 457 | pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
|
|---|
| 458 | #endif
|
|---|
| 459 | #ifdef PGMPOOL_WITH_CACHE
|
|---|
| 460 | pPage->iAgeNext = NIL_PGMPOOL_IDX;
|
|---|
| 461 | pPage->iAgePrev = NIL_PGMPOOL_IDX;
|
|---|
| 462 | #endif
|
|---|
| 463 | /* commit it */
|
|---|
| 464 | bool fRc = RTAvloHCPhysInsert(&pPool->HCPhysTree, &pPage->Core); Assert(fRc); NOREF(fRc);
|
|---|
| 465 | pPool->iFreeHead = i;
|
|---|
| 466 | pPool->cCurPages = i + 1;
|
|---|
| 467 | }
|
|---|
| 468 |
|
|---|
| 469 | Assert(pPool->cCurPages <= pPool->cMaxPages);
|
|---|
| 470 | return VINF_SUCCESS;
|
|---|
| 471 | }
|
|---|
| 472 |
|
|---|
| 473 |
|
|---|
| 474 | #ifdef PGMPOOL_WITH_MONITORING
|
|---|
| 475 |
|
|---|
| 476 | /**
|
|---|
| 477 | * Worker used by pgmR3PoolAccessHandler when it's invoked by an async thread.
|
|---|
| 478 | *
|
|---|
| 479 | * @param pPool The pool.
|
|---|
| 480 | * @param pPage The page.
|
|---|
| 481 | */
|
|---|
| 482 | static DECLCALLBACK(void) pgmR3PoolFlushReusedPage(PPGMPOOL pPool, PPGMPOOLPAGE pPage)
|
|---|
| 483 | {
|
|---|
| 484 | /* for the present this should be safe enough I think... */
|
|---|
| 485 | pgmLock(pPool->pVMR3);
|
|---|
| 486 | if ( pPage->fReusedFlushPending
|
|---|
| 487 | && pPage->enmKind != PGMPOOLKIND_FREE)
|
|---|
| 488 | pgmPoolFlushPage(pPool, pPage);
|
|---|
| 489 | pgmUnlock(pPool->pVMR3);
|
|---|
| 490 | }
|
|---|
| 491 |
|
|---|
| 492 |
|
|---|
| 493 | /**
|
|---|
| 494 | * \#PF Handler callback for PT write accesses.
|
|---|
| 495 | *
|
|---|
| 496 | * The handler can not raise any faults, it's mainly for monitoring write access
|
|---|
| 497 | * to certain pages.
|
|---|
| 498 | *
|
|---|
| 499 | * @returns VINF_SUCCESS if the handler have carried out the operation.
|
|---|
| 500 | * @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
|
|---|
| 501 | * @param pVM VM Handle.
|
|---|
| 502 | * @param GCPhys The physical address the guest is writing to.
|
|---|
| 503 | * @param pvPhys The HC mapping of that address.
|
|---|
| 504 | * @param pvBuf What the guest is reading/writing.
|
|---|
| 505 | * @param cbBuf How much it's reading/writing.
|
|---|
| 506 | * @param enmAccessType The access type.
|
|---|
| 507 | * @param pvUser User argument.
|
|---|
| 508 | */
|
|---|
| 509 | static DECLCALLBACK(int) pgmR3PoolAccessHandler(PVM pVM, RTGCPHYS GCPhys, void *pvPhys, void *pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
|
|---|
| 510 | {
|
|---|
| 511 | STAM_PROFILE_START(&pVM->pgm.s.pPoolR3->StatMonitorR3, a);
|
|---|
| 512 | PPGMPOOL pPool = pVM->pgm.s.pPoolR3;
|
|---|
| 513 | PPGMPOOLPAGE pPage = (PPGMPOOLPAGE)pvUser;
|
|---|
| 514 | LogFlow(("pgmR3PoolAccessHandler: GCPhys=%RGp %p:{.Core=%RHp, .idx=%d, .GCPhys=%RGp, .enmType=%d}\n",
|
|---|
| 515 | GCPhys, pPage, pPage->Core.Key, pPage->idx, pPage->GCPhys, pPage->enmKind));
|
|---|
| 516 |
|
|---|
| 517 | /*
|
|---|
| 518 | * We don't have to be very sophisiticated about this since there are relativly few calls here.
|
|---|
| 519 | * However, we must try our best to detect any non-cpu accesses (disk / networking).
|
|---|
| 520 | *
|
|---|
| 521 | * Just to make life more interesting, we'll have to deal with the async threads too.
|
|---|
| 522 | * We cannot flush a page if we're in an async thread because of REM notifications.
|
|---|
| 523 | */
|
|---|
| 524 | if (!VM_IS_EMT(pVM))
|
|---|
| 525 | {
|
|---|
| 526 | Log(("pgmR3PoolAccessHandler: async thread, requesting EMT to flush the page: %p:{.Core=%RHp, .idx=%d, .GCPhys=%RGp, .enmType=%d}\n",
|
|---|
| 527 | pPage, pPage->Core.Key, pPage->idx, pPage->GCPhys, pPage->enmKind));
|
|---|
| 528 | STAM_COUNTER_INC(&pPool->StatMonitorR3Async);
|
|---|
| 529 | if (!pPage->fReusedFlushPending)
|
|---|
| 530 | {
|
|---|
| 531 | int rc = VMR3ReqCallEx(pPool->pVMR3, VMREQDEST_ANY, NULL, 0, VMREQFLAGS_NO_WAIT | VMREQFLAGS_VOID, (PFNRT)pgmR3PoolFlushReusedPage, 2, pPool, pPage);
|
|---|
| 532 | AssertRCReturn(rc, rc);
|
|---|
| 533 | pPage->fReusedFlushPending = true;
|
|---|
| 534 | pPage->cModifications += 0x1000;
|
|---|
| 535 | }
|
|---|
| 536 | pgmPoolMonitorChainChanging(pPool, pPage, GCPhys, pvPhys, NULL);
|
|---|
| 537 | /** @todo r=bird: making unsafe assumption about not crossing entries here! */
|
|---|
| 538 | while (cbBuf > 4)
|
|---|
| 539 | {
|
|---|
| 540 | cbBuf -= 4;
|
|---|
| 541 | pvPhys = (uint8_t *)pvPhys + 4;
|
|---|
| 542 | GCPhys += 4;
|
|---|
| 543 | pgmPoolMonitorChainChanging(pPool, pPage, GCPhys, pvPhys, NULL);
|
|---|
| 544 | }
|
|---|
| 545 | STAM_PROFILE_STOP(&pPool->StatMonitorR3, a);
|
|---|
| 546 | }
|
|---|
| 547 | else if ( ( pPage->cModifications < 96 /* it's cheaper here. */
|
|---|
| 548 | || pgmPoolIsPageLocked(&pVM->pgm.s, pPage)
|
|---|
| 549 | )
|
|---|
| 550 | && cbBuf <= 4)
|
|---|
| 551 | {
|
|---|
| 552 | /* Clear the shadow entry. */
|
|---|
| 553 | if (!pPage->cModifications++)
|
|---|
| 554 | pgmPoolMonitorModifiedInsert(pPool, pPage);
|
|---|
| 555 | /** @todo r=bird: making unsafe assumption about not crossing entries here! */
|
|---|
| 556 | pgmPoolMonitorChainChanging(pPool, pPage, GCPhys, pvPhys, NULL);
|
|---|
| 557 | STAM_PROFILE_STOP(&pPool->StatMonitorR3, a);
|
|---|
| 558 | }
|
|---|
| 559 | else
|
|---|
| 560 | {
|
|---|
| 561 | pgmPoolMonitorChainFlush(pPool, pPage); /* ASSUME that VERR_PGM_POOL_CLEARED can be ignored here and that FFs will deal with it in due time. */
|
|---|
| 562 | STAM_PROFILE_STOP_EX(&pPool->StatMonitorR3, &pPool->StatMonitorR3FlushPage, a);
|
|---|
| 563 | }
|
|---|
| 564 |
|
|---|
| 565 | return VINF_PGM_HANDLER_DO_DEFAULT;
|
|---|
| 566 | }
|
|---|
| 567 |
|
|---|
| 568 | #endif /* PGMPOOL_WITH_MONITORING */
|
|---|
| 569 |
|
|---|
