/* $Id: CPUMAllSysRegs-armv8.cpp 99196 2023-03-28 13:06:05Z vboxsync $ */ /** @file * CPUM - ARMv8 CPU System Registers. */ /* * Copyright (C) 2023 Oracle and/or its affiliates. * * This file is part of VirtualBox base platform packages, as * available from https://www.virtualbox.org. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, in version 3 of the * License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see . * * SPDX-License-Identifier: GPL-3.0-only */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #define LOG_GROUP LOG_GROUP_CPUM #include #include "CPUMInternal-armv8.h" #include #include /********************************************************************************************************************************* * Defined Constants And Macros * *********************************************************************************************************************************/ /** * Validates the CPUMSYSREGRANGE::offCpumCpu value and declares a local variable * pointing to it. * * ASSUMES sizeof(a_Type) is a power of two and that the member is aligned * correctly. */ #define CPUM_SYSREG_ASSERT_CPUMCPU_OFFSET_RETURN(a_pVCpu, a_pRange, a_Type, a_VarName) \ AssertMsgReturn( (a_pRange)->offCpumCpu >= 8 \ && (a_pRange)->offCpumCpu < sizeof(CPUMCPU) \ && !((a_pRange)->offCpumCpu & (RT_MIN(sizeof(a_Type), 8) - 1)) \ , ("offCpumCpu=%#x %s\n", (a_pRange)->offCpumCpu, (a_pRange)->szName), \ VERR_CPUM_MSR_BAD_CPUMCPU_OFFSET); \ a_Type *a_VarName = (a_Type *)((uintptr_t)&(a_pVCpu)->cpum.s + (a_pRange)->offCpumCpu) /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** * Implements reading one or more system registers. * * @returns VBox status code. * @retval VINF_SUCCESS on success. * @retval VINF_CPUM_R3_MSR_READ if the MSR read could not be serviced in the * current context (raw-mode or ring-0). * @retval VERR_CPUM_RAISE_GP_0 on failure (invalid system register). * * @param pVCpu The cross context virtual CPU structure. * @param idSysReg The system register we're reading. * @param pRange The system register range descriptor. * @param puValue Where to return the value. */ typedef DECLCALLBACKTYPE(VBOXSTRICTRC, FNCPUMRDSYSREG,(PVMCPUCC pVCpu, uint32_t idSysReg, PCCPUMSYSREGRANGE pRange, uint64_t *puValue)); /** Pointer to a MRS worker for a specific system register or range of system registers. */ typedef FNCPUMRDSYSREG *PFNCPUMRDSYSREG; /** * Implements writing one or more system registers. * * @retval VINF_SUCCESS on success. * @retval VINF_CPUM_R3_MSR_WRITE if the MSR write could not be serviced in the * current context (raw-mode or ring-0). * @retval VERR_CPUM_RAISE_GP_0 on failure. * * @param pVCpu The cross context virtual CPU structure. * @param idSysReg The system register we're writing. * @param pRange The system register range descriptor. * @param uValue The value to set, ignored bits masked. * @param uRawValue The raw value with the ignored bits not masked. */ typedef DECLCALLBACKTYPE(VBOXSTRICTRC, FNCPUMWRSYSREG,(PVMCPUCC pVCpu, uint32_t idSysReg, PCCPUMSYSREGRANGE pRange, uint64_t uValue, uint64_t uRawValue)); /** Pointer to a MSR worker for a specific system register or range of system registers. */ typedef FNCPUMWRSYSREG *PFNCPUMWRSYSREG; /* * Generic functions. * Generic functions. * Generic functions. */ /** @callback_method_impl{FNCPUMRDSYSREG} */ static DECLCALLBACK(VBOXSTRICTRC) cpumSysRegRd_FixedValue(PVMCPUCC pVCpu, uint32_t idSysReg, PCCPUMSYSREGRANGE pRange, uint64_t *puValue) { RT_NOREF_PV(pVCpu); RT_NOREF_PV(idSysReg); *puValue = pRange->uValue; return VINF_SUCCESS; } /** @callback_method_impl{FNCPUMWRSYSREG} */ static DECLCALLBACK(VBOXSTRICTRC) cpumSysRegWr_IgnoreWrite(PVMCPUCC pVCpu, uint32_t idSysReg, PCCPUMSYSREGRANGE pRange, uint64_t uValue, uint64_t uRawValue) { RT_NOREF_PV(pVCpu); RT_NOREF_PV(idSysReg); RT_NOREF_PV(pRange); RT_NOREF_PV(uValue); RT_NOREF_PV(uRawValue); Log(("CPUM: Ignoring MSR %#x (%s), %#llx\n", idSysReg, pRange->szName, uValue)); return VINF_SUCCESS; } /** @callback_method_impl{FNCPUMRDSYSREG} */ static DECLCALLBACK(VBOXSTRICTRC) cpumSysRegRd_WriteOnly(PVMCPUCC pVCpu, uint32_t idSysReg, PCCPUMSYSREGRANGE pRange, uint64_t *puValue) { RT_NOREF_PV(pVCpu); RT_NOREF_PV(idSysReg); RT_NOREF_PV(pRange); RT_NOREF_PV(puValue); return VERR_CPUM_RAISE_GP_0; } /** @callback_method_impl{FNCPUMWRSYSREG} */ static DECLCALLBACK(VBOXSTRICTRC) cpumSysRegWr_ReadOnly(PVMCPUCC pVCpu, uint32_t idSysReg, PCCPUMSYSREGRANGE pRange, uint64_t uValue, uint64_t uRawValue) { RT_NOREF_PV(pVCpu); RT_NOREF_PV(idSysReg); RT_NOREF_PV(pRange); RT_NOREF_PV(uValue); RT_NOREF_PV(uRawValue); Assert(pRange->fWrExcpMask == UINT64_MAX); return VERR_CPUM_RAISE_GP_0; } /** * System register read function table. */ static const struct READSYSREGCLANG11WEIRDNOTHROW { PFNCPUMRDSYSREG pfnRdSysReg; } g_aCpumRdSysRegFns[kCpumSysRegRdFn_End] = { { NULL }, /* Invalid */ { cpumSysRegRd_FixedValue }, { NULL }, /* Alias */ { cpumSysRegRd_WriteOnly }, }; /** * System register write function table. */ static const struct WRITESYSREGCLANG11WEIRDNOTHROW { PFNCPUMWRSYSREG pfnWrSysReg; } g_aCpumWrSysRegFns[kCpumSysRegWrFn_End] = { { NULL }, /* Invalid */ { cpumSysRegWr_IgnoreWrite }, { cpumSysRegWr_ReadOnly }, { NULL }, /* Alias */ }; /** * Looks up the range for the given system register. * * @returns Pointer to the range if found, NULL if not. * @param pVM The cross context VM structure. * @param idSysReg The system register to look up. */ # ifndef IN_RING3 static # endif PCPUMSYSREGRANGE cpumLookupSysRegRange(PVM pVM, uint32_t idSysReg) { /* * Binary lookup. */ uint32_t cRanges = RT_MIN(pVM->cpum.s.GuestInfo.cSysRegRanges, RT_ELEMENTS(pVM->cpum.s.GuestInfo.aSysRegRanges)); if (!cRanges) return NULL; PCPUMSYSREGRANGE paRanges = pVM->cpum.s.GuestInfo.aSysRegRanges; for (;;) { uint32_t i = cRanges / 2; if (idSysReg < paRanges[i].uFirst) { if (i == 0) break; cRanges = i; } else if (idSysReg > paRanges[i].uLast) { i++; if (i >= cRanges) break; cRanges -= i; paRanges = &paRanges[i]; } else { if (paRanges[i].enmRdFn == kCpumSysRegRdFn_Alias) return cpumLookupSysRegRange(pVM, paRanges[i].uValue); return &paRanges[i]; } } # ifdef VBOX_STRICT /* * Linear lookup to verify the above binary search. */ uint32_t cLeft = RT_MIN(pVM->cpum.s.GuestInfo.cSysRegRanges, RT_ELEMENTS(pVM->cpum.s.GuestInfo.aSysRegRanges)); PCPUMSYSREGRANGE pCur = pVM->cpum.s.GuestInfo.aSysRegRanges; while (cLeft-- > 0) { if (idSysReg >= pCur->uFirst && idSysReg <= pCur->uLast) { AssertFailed(); if (pCur->enmRdFn == kCpumSysRegRdFn_Alias) return cpumLookupSysRegRange(pVM, pCur->uValue); return pCur; } pCur++; } # endif return NULL; } /** * Query a guest system register. * * The caller is responsible for checking privilege if the call is the result of * a MRS instruction. We'll do the rest. * * @retval VINF_SUCCESS on success. * @retval VINF_CPUM_R3_MSR_READ if the system register read could not be serviced in the * current context (raw-mode or ring-0). * @retval VERR_CPUM_RAISE_GP_0 on failure (invalid system register), the caller is * expected to take the appropriate actions. @a *puValue is set to 0. * @param pVCpu The cross context virtual CPU structure. * @param idSysReg The system register. * @param puValue Where to return the value. * * @remarks This will always return the right values, even when we're in the * recompiler. */ VMMDECL(VBOXSTRICTRC) CPUMQueryGuestSysReg(PVMCPUCC pVCpu, uint32_t idSysReg, uint64_t *puValue) { *puValue = 0; VBOXSTRICTRC rcStrict; PVM pVM = pVCpu->CTX_SUFF(pVM); PCPUMSYSREGRANGE pRange = cpumLookupSysRegRange(pVM, idSysReg); if (pRange) { CPUMSYSREGRDFN enmRdFn = (CPUMSYSREGRDFN)pRange->enmRdFn; AssertReturn(enmRdFn > kCpumSysRegRdFn_Invalid && enmRdFn < kCpumSysRegRdFn_End, VERR_CPUM_IPE_1); PFNCPUMRDSYSREG pfnRdSysReg = g_aCpumRdSysRegFns[enmRdFn].pfnRdSysReg; AssertReturn(pfnRdSysReg, VERR_CPUM_IPE_2); STAM_COUNTER_INC(&pRange->cReads); STAM_REL_COUNTER_INC(&pVM->cpum.s.cSysRegReads); rcStrict = pfnRdSysReg(pVCpu, idSysReg, pRange, puValue); if (rcStrict == VINF_SUCCESS) Log2(("CPUM: MRS %#x (%s) -> %#llx\n", idSysReg, pRange->szName, *puValue)); else if (rcStrict == VERR_CPUM_RAISE_GP_0) { Log(("CPUM: MRS %#x (%s) -> #GP(0)\n", idSysReg, pRange->szName)); STAM_COUNTER_INC(&pRange->cExcp); STAM_REL_COUNTER_INC(&pVM->cpum.s.cSysRegReadsRaiseExcp); } #ifndef IN_RING3 else if (rcStrict == VINF_CPUM_R3_MSR_READ) Log(("CPUM: MRS %#x (%s) -> ring-3\n", idSysReg, pRange->szName)); #endif else { Log(("CPUM: MRS %#x (%s) -> rcStrict=%Rrc\n", idSysReg, pRange->szName, VBOXSTRICTRC_VAL(rcStrict))); AssertMsgStmt(RT_FAILURE_NP(rcStrict), ("%Rrc idSysReg=%#x\n", VBOXSTRICTRC_VAL(rcStrict), idSysReg), rcStrict = VERR_IPE_UNEXPECTED_INFO_STATUS); Assert(rcStrict != VERR_EM_INTERPRETER); } } else { Log(("CPUM: Unknown MRS %#x -> Ignore\n", idSysReg)); STAM_REL_COUNTER_INC(&pVM->cpum.s.cSysRegReads); STAM_REL_COUNTER_INC(&pVM->cpum.s.cSysRegReadsUnknown); *puValue = 0; rcStrict = VINF_SUCCESS; } return rcStrict; } /** * Writes to a guest system register. * * The caller is responsible for checking privilege if the call is the result of * a MSR instruction. We'll do the rest. * * @retval VINF_SUCCESS on success. * @retval VINF_CPUM_R3_MSR_WRITE if the system register write could not be serviced in the * current context (raw-mode or ring-0). * @retval VERR_CPUM_RAISE_GP_0 on failure, the caller is expected to take the * appropriate actions. * * @param pVCpu The cross context virtual CPU structure. * @param idSysReg The system register id. * @param uValue The value to set. * * @remarks Everyone changing system register values, shall do it * by calling this method. This makes sure we have current values and * that we trigger all the right actions when something changes. */ VMMDECL(VBOXSTRICTRC) CPUMSetGuestSysReg(PVMCPUCC pVCpu, uint32_t idSysReg, uint64_t uValue) { VBOXSTRICTRC rcStrict; PVM pVM = pVCpu->CTX_SUFF(pVM); PCPUMSYSREGRANGE pRange = cpumLookupSysRegRange(pVM, idSysReg); if (pRange) { STAM_COUNTER_INC(&pRange->cWrites); STAM_REL_COUNTER_INC(&pVM->cpum.s.cSysRegWrites); if (!(uValue & pRange->fWrExcpMask)) { CPUMSYSREGWRFN enmWrFn = (CPUMSYSREGWRFN)pRange->enmWrFn; AssertReturn(enmWrFn > kCpumSysRegWrFn_Invalid && enmWrFn < kCpumSysRegWrFn_End, VERR_CPUM_IPE_1); PFNCPUMWRSYSREG pfnWrSysReg = g_aCpumWrSysRegFns[enmWrFn].pfnWrSysReg; AssertReturn(pfnWrSysReg, VERR_CPUM_IPE_2); uint64_t uValueAdjusted = uValue & ~pRange->fWrIgnMask; if (uValueAdjusted != uValue) { STAM_COUNTER_INC(&pRange->cIgnoredBits); STAM_REL_COUNTER_INC(&pVM->cpum.s.cSysRegWritesToIgnoredBits); } rcStrict = pfnWrSysReg(pVCpu, idSysReg, pRange, uValueAdjusted, uValue); if (rcStrict == VINF_SUCCESS) Log2(("CPUM: MSR %#x (%s), %#llx [%#llx]\n", idSysReg, pRange->szName, uValueAdjusted, uValue)); else if (rcStrict == VERR_CPUM_RAISE_GP_0) { Log(("CPUM: MSR %#x (%s), %#llx [%#llx] -> #GP(0)\n", idSysReg, pRange->szName, uValueAdjusted, uValue)); STAM_COUNTER_INC(&pRange->cExcp); STAM_REL_COUNTER_INC(&pVM->cpum.s.cSysRegWritesRaiseExcp); } #ifndef IN_RING3 else if (rcStrict == VINF_CPUM_R3_MSR_WRITE) Log(("CPUM: MSR %#x (%s), %#llx [%#llx] -> ring-3\n", idSysReg, pRange->szName, uValueAdjusted, uValue)); #endif else { Log(("CPUM: MSR %#x (%s), %#llx [%#llx] -> rcStrict=%Rrc\n", idSysReg, pRange->szName, uValueAdjusted, uValue, VBOXSTRICTRC_VAL(rcStrict))); AssertMsgStmt(RT_FAILURE_NP(rcStrict), ("%Rrc idSysReg=%#x\n", VBOXSTRICTRC_VAL(rcStrict), idSysReg), rcStrict = VERR_IPE_UNEXPECTED_INFO_STATUS); Assert(rcStrict != VERR_EM_INTERPRETER); } } else { Log(("CPUM: MSR %#x (%s), %#llx -> #GP(0) - invalid bits %#llx\n", idSysReg, pRange->szName, uValue, uValue & pRange->fWrExcpMask)); STAM_COUNTER_INC(&pRange->cExcp); STAM_REL_COUNTER_INC(&pVM->cpum.s.cSysRegWritesRaiseExcp); rcStrict = VERR_CPUM_RAISE_GP_0; } } else { Log(("CPUM: Unknown MSR %#x, %#llx -> #GP(0)\n", idSysReg, uValue)); STAM_REL_COUNTER_INC(&pVM->cpum.s.cSysRegWrites); STAM_REL_COUNTER_INC(&pVM->cpum.s.cSysRegWritesUnknown); rcStrict = VERR_CPUM_RAISE_GP_0; } return rcStrict; } #if defined(VBOX_STRICT) && defined(IN_RING3) /** * Performs some checks on the static data related to MSRs. * * @returns VINF_SUCCESS on success, error on failure. */ int cpumR3SysRegStrictInitChecks(void) { #define CPUM_ASSERT_RD_SYSREG_FN(a_Register) \ AssertReturn(g_aCpumRdSysRegFns[kCpumSysRegRdFn_##a_Register].pfnRdSysReg == cpumSysRegRd_##a_Register, VERR_CPUM_IPE_2); #define CPUM_ASSERT_WR_SYSREG_FN(a_Register) \ AssertReturn(g_aCpumWrSysRegFns[kCpumSysRegWrFn_##a_Register].pfnWrSysReg == cpumSysRegWr_##a_Register, VERR_CPUM_IPE_2); AssertReturn(g_aCpumRdSysRegFns[kCpumSysRegRdFn_Invalid].pfnRdSysReg == NULL, VERR_CPUM_IPE_2); CPUM_ASSERT_RD_SYSREG_FN(FixedValue); CPUM_ASSERT_RD_SYSREG_FN(WriteOnly); AssertReturn(g_aCpumWrSysRegFns[kCpumSysRegWrFn_Invalid].pfnWrSysReg == NULL, VERR_CPUM_IPE_2); return VINF_SUCCESS; } #endif /* VBOX_STRICT && IN_RING3 */