HWACCMGCA.asm@ 19032

Last change on this file since 19032 was 15962, checked in by vboxsync, 16 years ago
Added debugging code (inactive) for tracking the state of the 32/64 switcher in crash dumps
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 16.0 KB

Line
1	; $Id: HWACCMGCA.asm 15962 2009-01-15 12:33:49Z vboxsync $
2	;; @file
3	; VMXM - GC vmx helpers
4	;
5
6	;
7	; Copyright (C) 2006-2007 Sun Microsystems, Inc.
8	;
9	; This file is part of VirtualBox Open Source Edition (OSE), as
10	; available from http://www.virtualbox.org. This file is free software;
11	; you can redistribute it and/or modify it under the terms of the GNU
12	; General Public License (GPL) as published by the Free Software
13	; Foundation, in version 2 as it comes in the "COPYING" file of the
14	; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	;
17	; Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	; Clara, CA 95054 USA or visit http://www.sun.com if you need
19	; additional information or have any questions.
20	;
21
22	;*******************************************************************************
23	;* Header Files *
24	;*******************************************************************************
25	%undef RT_ARCH_X86
26	%define RT_ARCH_AMD64
27	%include "VBox/asmdefs.mac"
28	%include "VBox/err.mac"
29	%include "VBox/hwacc_vmx.mac"
30	%include "VBox/cpum.mac"
31	%include "VBox/x86.mac"
32	%include "../HWACCMInternal.mac"
33
34	%ifdef RT_OS_OS2 ;; @todo fix OMF support in yasm and kick nasm out completely.
35	%macro vmwrite 2,
36	int3
37	%endmacro
38	%define vmlaunch int3
39	%define vmresume int3
40	%define vmsave int3
41	%define vmload int3
42	%define vmrun int3
43	%define clgi int3
44	%define stgi int3
45	%macro invlpga 2,
46	int3
47	%endmacro
48	%endif
49
50	;; @def MYPUSHSEGS
51	; Macro saving all segment registers on the stack.
52	; @param 1 full width register name
53
54	;; @def MYPOPSEGS
55	; Macro restoring all segment registers on the stack
56	; @param 1 full width register name
57
58	; Load the corresponding guest MSR (trashes rdx & rcx)
59	%macro LOADGUESTMSR 2
60	mov rcx, %1
61	mov edx, dword [rsi + %2 + 4]
62	mov eax, dword [rsi + %2]
63	wrmsr
64	%endmacro
65
66	; Save a guest MSR (trashes rdx & rcx)
67	; Only really useful for gs kernel base as that one can be changed behind our back (swapgs)
68	%macro SAVEGUESTMSR 2
69	mov rcx, %1
70	rdmsr
71	mov dword [rsi + %2], eax
72	mov dword [rsi + %2 + 4], edx
73	%endmacro
74
75	%macro MYPUSHSEGS 1
76	mov %1, es
77	push %1
78	mov %1, ds
79	push %1
80	%endmacro
81
82	%macro MYPOPSEGS 1
83	pop %1
84	mov ds, %1
85	pop %1
86	mov es, %1
87	%endmacro
88
89	BEGINCODE
90	BITS 64
91
92
93	;/**
94	; * Prepares for and executes VMLAUNCH/VMRESUME (64 bits guest mode)
95	; *
96	; * @returns VBox status code
97	; * @param pPageCpuPhys VMXON physical address [rsp+8]
98	; * @param pVMCSPhys VMCS physical address [rsp+16]
99	; * @param pCache VMCS cache [rsp+24]
100	; * @param pCtx Guest context (rsi)
101	; */
102	BEGINPROC VMXGCStartVM64
103	push rbp
104	mov rbp, rsp
105
106	; Make sure VT-x instructions are allowed
107	mov rax, cr4
108	or rax, X86_CR4_VMXE
109	mov cr4, rax
110
111	;/* Enter VMX Root Mode */
112	vmxon [rbp + 8 + 8]
113	jnc .vmxon_success
114	mov rax, VERR_VMX_INVALID_VMXON_PTR
115	jmp .vmstart64_vmxon_failed
116
117	.vmxon_success:
118	jnz .vmxon_success2
119	mov rax, VERR_VMX_GENERIC
120	jmp .vmstart64_vmxon_failed
121
122	.vmxon_success2:
123	; Activate the VMCS pointer
124	vmptrld [rbp + 16 + 8]
125	jnc .vmptrld_success
126	mov rax, VERR_VMX_INVALID_VMCS_PTR
127	jmp .vmstart64_vmxoff_end
128
129	.vmptrld_success:
130	jnz .vmptrld_success2
131	mov rax, VERR_VMX_GENERIC
132	jmp .vmstart64_vmxoff_end
133
134	.vmptrld_success2:
135
136	; Save the VMCS pointer on the stack
137	push qword [rbp + 16 + 8];
138
139	;/* Save segment registers */
140	MYPUSHSEGS rax
141
142	%ifdef VMX_USE_CACHED_VMCS_ACCESSES
143	; Flush the VMCS write cache first (before any other vmreads/vmwrites!)
144	mov rbx, [rbp + 24 + 8] ; pCache
145
146	%ifdef VBOX_WITH_CRASHDUMP_MAGIC
147	mov qword [rbx + VMCSCACHE.uPos], 2
148	%endif
149
150	%ifdef DEBUG
151	mov rax, [rbp + 8 + 8] ; pPageCpuPhys
152	mov [rbx + VMCSCACHE.TestIn.pPageCpuPhys], rax
153	mov rax, [rbp + 16 + 8] ; pVMCSPhys
154	mov [rbx + VMCSCACHE.TestIn.pVMCSPhys], rax
155	mov [rbx + VMCSCACHE.TestIn.pCache], rbx
156	mov [rbx + VMCSCACHE.TestIn.pCtx], rsi
157	%endif
158
159	mov ecx, [rbx + VMCSCACHE.Write.cValidEntries]
160	cmp ecx, 0
161	je .no_cached_writes
162	mov rdx, rcx
163	mov rcx, 0
164	jmp .cached_write
165
166	ALIGN(16)
167	.cached_write:
168	mov eax, [rbx + VMCSCACHE.Write.aField + rcx*4]
169	vmwrite rax, qword [rbx + VMCSCACHE.Write.aFieldVal + rcx*8]
170	inc rcx
171	cmp rcx, rdx
172	jl .cached_write
173
174	mov dword [rbx + VMCSCACHE.Write.cValidEntries], 0
175	.no_cached_writes:
176
177	%ifdef VBOX_WITH_CRASHDUMP_MAGIC
178	mov qword [rbx + VMCSCACHE.uPos], 3
179	%endif
180	; Save the pCache pointer
181	push xBX
182	%endif
183
184	; Save the host state that's relevant in the temporary 64 bits mode
185	mov rdx, cr0
186	mov eax, VMX_VMCS_HOST_CR0
187	vmwrite rax, rdx
188
189	mov rdx, cr3
190	mov eax, VMX_VMCS_HOST_CR3
191	vmwrite rax, rdx
192
193	mov rdx, cr4
194	mov eax, VMX_VMCS_HOST_CR4
195	vmwrite rax, rdx
196
197	mov rdx, cs
198	mov eax, VMX_VMCS_HOST_FIELD_CS
199	vmwrite rax, rdx
200
201	mov rdx, ss
202	mov eax, VMX_VMCS_HOST_FIELD_SS
203	vmwrite rax, rdx
204
205	sub rsp, 8*2
206	sgdt [rsp]
207	mov eax, VMX_VMCS_HOST_GDTR_BASE
208	vmwrite rax, [rsp+2]
209	add rsp, 8*2
210
211	%ifdef VBOX_WITH_CRASHDUMP_MAGIC
212	mov qword [rbx + VMCSCACHE.uPos], 4
213	%endif
214
215	; hopefully we can ignore TR (we restore it anyway on the way back to 32 bits mode)
216
217	;/* First we have to save some final CPU context registers. */
218	lea rdx, [.vmlaunch64_done wrt rip]
219	mov rax, VMX_VMCS_HOST_RIP ;/* return address (too difficult to continue after VMLAUNCH?) */
220	vmwrite rax, rdx
221	;/* Note: assumes success... */
222
223	;/* Manual save and restore:
224	; * - General purpose registers except RIP, RSP
225	; *
226	; * Trashed:
227	; * - CR2 (we don't care)
228	; * - LDTR (reset to 0)
229	; * - DRx (presumably not changed at all)
230	; * - DR7 (reset to 0x400)
231	; * - EFLAGS (reset to RT_BIT(1); not relevant)
232	; *
233	; */
234
235	; Load the guest LSTAR, CSTAR, SFMASK & KERNEL_GSBASE MSRs
236	;; @todo use the automatic load feature for MSRs
237	LOADGUESTMSR MSR_K8_LSTAR, CPUMCTX.msrLSTAR
238	%if 0 ; not supported on Intel CPUs
239	LOADGUESTMSR MSR_K8_CSTAR, CPUMCTX.msrCSTAR
240	%endif
241	LOADGUESTMSR MSR_K6_STAR, CPUMCTX.msrSTAR
242	LOADGUESTMSR MSR_K8_SF_MASK, CPUMCTX.msrSFMASK
243	LOADGUESTMSR MSR_K8_KERNEL_GS_BASE, CPUMCTX.msrKERNELGSBASE
244
245	%ifdef VBOX_WITH_CRASHDUMP_MAGIC
246	mov qword [rbx + VMCSCACHE.uPos], 5
247	%endif
248
249	; Save the pCtx pointer
250	push rsi
251
252	; Restore CR2
253	mov rbx, qword [rsi + CPUMCTX.cr2]
254	mov cr2, rbx
255
256	mov eax, VMX_VMCS_HOST_RSP
257	vmwrite rax, rsp
258	;/* Note: assumes success... */
259	;/* Don't mess with ESP anymore!! */
260
261	;/* Restore Guest's general purpose registers. */
262	mov rax, qword [rsi + CPUMCTX.eax]
263	mov rbx, qword [rsi + CPUMCTX.ebx]
264	mov rcx, qword [rsi + CPUMCTX.ecx]
265	mov rdx, qword [rsi + CPUMCTX.edx]
266	mov rbp, qword [rsi + CPUMCTX.ebp]
267	mov r8, qword [rsi + CPUMCTX.r8]
268	mov r9, qword [rsi + CPUMCTX.r9]
269	mov r10, qword [rsi + CPUMCTX.r10]
270	mov r11, qword [rsi + CPUMCTX.r11]
271	mov r12, qword [rsi + CPUMCTX.r12]
272	mov r13, qword [rsi + CPUMCTX.r13]
273	mov r14, qword [rsi + CPUMCTX.r14]
274	mov r15, qword [rsi + CPUMCTX.r15]
275
276	;/* Restore rdi & rsi. */
277	mov rdi, qword [rsi + CPUMCTX.edi]
278	mov rsi, qword [rsi + CPUMCTX.esi]
279
280	vmlaunch
281	jmp .vmlaunch64_done; ;/* here if vmlaunch detected a failure. */
282
283	ALIGNCODE(16)
284	.vmlaunch64_done:
285	jc near .vmstart64_invalid_vmxon_ptr
286	jz near .vmstart64_start_failed
287
288	push rdi
289	mov rdi, [rsp + 8] ; pCtx
290
291	mov qword [rdi + CPUMCTX.eax], rax
292	mov qword [rdi + CPUMCTX.ebx], rbx
293	mov qword [rdi + CPUMCTX.ecx], rcx
294	mov qword [rdi + CPUMCTX.edx], rdx
295	mov qword [rdi + CPUMCTX.esi], rsi
296	mov qword [rdi + CPUMCTX.ebp], rbp
297	mov qword [rdi + CPUMCTX.r8], r8
298	mov qword [rdi + CPUMCTX.r9], r9
299	mov qword [rdi + CPUMCTX.r10], r10
300	mov qword [rdi + CPUMCTX.r11], r11
301	mov qword [rdi + CPUMCTX.r12], r12
302	mov qword [rdi + CPUMCTX.r13], r13
303	mov qword [rdi + CPUMCTX.r14], r14
304	mov qword [rdi + CPUMCTX.r15], r15
305
306	pop rax ; the guest edi we pushed above
307	mov qword [rdi + CPUMCTX.edi], rax
308
309	pop rsi ; pCtx (needed in rsi by the macros below)
310
311	;; @todo use the automatic load feature for MSRs
312	SAVEGUESTMSR MSR_K8_KERNEL_GS_BASE, CPUMCTX.msrKERNELGSBASE
313
314	%ifdef VMX_USE_CACHED_VMCS_ACCESSES
315	pop rdi ; saved pCache
316
317	%ifdef VBOX_WITH_CRASHDUMP_MAGIC
318	mov dword [rdi + VMCSCACHE.uPos], 7
319	%endif
320	%ifdef DEBUG
321	mov [rdi + VMCSCACHE.TestOut.pCache], rdi
322	mov [rdi + VMCSCACHE.TestOut.pCtx], rsi
323	mov rax, cr8
324	mov [rdi + VMCSCACHE.TestOut.cr8], rax
325	%endif
326
327	mov ecx, [rdi + VMCSCACHE.Read.cValidEntries]
328	cmp ecx, 0 ; can't happen
329	je .no_cached_reads
330	jmp .cached_read
331
332	ALIGN(16)
333	.cached_read:
334	dec rcx
335	mov eax, [rdi + VMCSCACHE.Read.aField + rcx*4]
336	vmread qword [rdi + VMCSCACHE.Read.aFieldVal + rcx*8], rax
337	cmp rcx, 0
338	jnz .cached_read
339	.no_cached_reads:
340
341	; Save CR2 for EPT
342	mov rax, cr2
343	mov [rdi + VMCSCACHE.cr2], rax
344	%ifdef VBOX_WITH_CRASHDUMP_MAGIC
345	mov dword [rdi + VMCSCACHE.uPos], 8
346	%endif
347	%endif
348
349	; Restore segment registers
350	MYPOPSEGS rax
351
352	mov eax, VINF_SUCCESS
353
354	%ifdef VBOX_WITH_CRASHDUMP_MAGIC
355	mov dword [rdi + VMCSCACHE.uPos], 9
356	%endif
357	.vmstart64_end:
358
359	%ifdef VMX_USE_CACHED_VMCS_ACCESSES
360	%ifdef DEBUG
361	mov rdx, [rsp] ; pVMCSPhys
362	mov [rdi + VMCSCACHE.TestOut.pVMCSPhys], rdx
363	%endif
364	%endif
365
366	; Write back the data and disable the VMCS
367	vmclear qword [rsp] ;Pushed pVMCS
368	add rsp, 8
369
370	.vmstart64_vmxoff_end:
371	; Disable VMX root mode
372	vmxoff
373	.vmstart64_vmxon_failed:
374	%ifdef VMX_USE_CACHED_VMCS_ACCESSES
375	%ifdef DEBUG
376	cmp eax, VINF_SUCCESS
377	jne .skip_flags_save
378
379	pushf
380	pop rdx
381	mov [rdi + VMCSCACHE.TestOut.eflags], rdx
382	%ifdef VBOX_WITH_CRASHDUMP_MAGIC
383	mov dword [rdi + VMCSCACHE.uPos], 12
384	%endif
385	.skip_flags_save:
386	%endif
387	%endif
388	pop rbp
389	ret
390
391
392	.vmstart64_invalid_vmxon_ptr:
393	pop rsi ; pCtx (needed in rsi by the macros below)
394
395	%ifdef VMX_USE_CACHED_VMCS_ACCESSES
396	pop rdi ; pCache
397	%ifdef VBOX_WITH_CRASHDUMP_MAGIC
398	mov dword [rdi + VMCSCACHE.uPos], 10
399	%endif
400
401	%ifdef DEBUG
402	mov [rdi + VMCSCACHE.TestOut.pCache], rdi
403	mov [rdi + VMCSCACHE.TestOut.pCtx], rsi
404	%endif
405
406	%endif
407
408	; Restore segment registers
409	MYPOPSEGS rax
410
411	; Restore all general purpose host registers.
412	mov eax, VERR_VMX_INVALID_VMXON_PTR
413	jmp .vmstart64_end
414
415	.vmstart64_start_failed:
416	pop rsi ; pCtx (needed in rsi by the macros below)
417
418	%ifdef VMX_USE_CACHED_VMCS_ACCESSES
419	pop rdi ; pCache
420
421	%ifdef DEBUG
422	mov [rdi + VMCSCACHE.TestOut.pCache], rdi
423	mov [rdi + VMCSCACHE.TestOut.pCtx], rsi
424	%endif
425	%ifdef VBOX_WITH_CRASHDUMP_MAGIC
426	mov dword [rdi + VMCSCACHE.uPos], 11
427	%endif
428
429	%endif
430
431	; Restore segment registers
432	MYPOPSEGS rax
433
434	; Restore all general purpose host registers.
435	mov eax, VERR_VMX_UNABLE_TO_START_VM
436	jmp .vmstart64_end
437	ENDPROC VMXGCStartVM64
438
439
440	;/**
441	; * Prepares for and executes VMRUN (64 bits guests)
442	; *
443	; * @returns VBox status code
444	; * @param HCPhysVMCB Physical address of host VMCB (rsp+8)
445	; * @param HCPhysVMCB Physical address of guest VMCB (rsp+16)
446	; * @param pCtx Guest context (rsi)
447	; */
448	BEGINPROC SVMGCVMRun64
449	push rbp
450	mov rbp, rsp
451	pushf
452
453	;/* Manual save and restore:
454	; * - General purpose registers except RIP, RSP, RAX
455	; *
456	; * Trashed:
457	; * - CR2 (we don't care)
458	; * - LDTR (reset to 0)
459	; * - DRx (presumably not changed at all)
460	; * - DR7 (reset to 0x400)
461	; */
462
463	;/* Save the Guest CPU context pointer. */
464	push rsi ; push for saving the state at the end
465
466	; save host fs, gs, sysenter msr etc
467	mov rax, [rbp + 8 + 8] ; pVMCBHostPhys (64 bits physical address)
468	push rax ; save for the vmload after vmrun
469	vmsave
470
471	; setup eax for VMLOAD
472	mov rax, [rbp + 8 + 8 + RTHCPHYS_CB] ; pVMCBPhys (64 bits physical address)
473
474	;/* Restore Guest's general purpose registers. */
475	;/* RAX is loaded from the VMCB by VMRUN */
476	mov rbx, qword [rsi + CPUMCTX.ebx]
477	mov rcx, qword [rsi + CPUMCTX.ecx]
478	mov rdx, qword [rsi + CPUMCTX.edx]
479	mov rdi, qword [rsi + CPUMCTX.edi]
480	mov rbp, qword [rsi + CPUMCTX.ebp]
481	mov r8, qword [rsi + CPUMCTX.r8]
482	mov r9, qword [rsi + CPUMCTX.r9]
483	mov r10, qword [rsi + CPUMCTX.r10]
484	mov r11, qword [rsi + CPUMCTX.r11]
485	mov r12, qword [rsi + CPUMCTX.r12]
486	mov r13, qword [rsi + CPUMCTX.r13]
487	mov r14, qword [rsi + CPUMCTX.r14]
488	mov r15, qword [rsi + CPUMCTX.r15]
489	mov rsi, qword [rsi + CPUMCTX.esi]
490
491	; Clear the global interrupt flag & execute sti to make sure external interrupts cause a world switch
492	clgi
493	sti
494
495	; load guest fs, gs, sysenter msr etc
496	vmload
497	; run the VM
498	vmrun
499
500	;/* RAX is in the VMCB already; we can use it here. */
501
502	; save guest fs, gs, sysenter msr etc
503	vmsave
504
505	; load host fs, gs, sysenter msr etc
506	pop rax ; pushed above
507	vmload
508
509	; Set the global interrupt flag again, but execute cli to make sure IF=0.
510	cli
511	stgi
512
513	pop rax ; pCtx
514
515	mov qword [rax + CPUMCTX.ebx], rbx
516	mov qword [rax + CPUMCTX.ecx], rcx
517	mov qword [rax + CPUMCTX.edx], rdx
518	mov qword [rax + CPUMCTX.esi], rsi
519	mov qword [rax + CPUMCTX.edi], rdi
520	mov qword [rax + CPUMCTX.ebp], rbp
521	mov qword [rax + CPUMCTX.r8], r8
522	mov qword [rax + CPUMCTX.r9], r9
523	mov qword [rax + CPUMCTX.r10], r10
524	mov qword [rax + CPUMCTX.r11], r11
525	mov qword [rax + CPUMCTX.r12], r12
526	mov qword [rax + CPUMCTX.r13], r13
527	mov qword [rax + CPUMCTX.r14], r14
528	mov qword [rax + CPUMCTX.r15], r15
529
530	mov eax, VINF_SUCCESS
531
532	popf
533	pop rbp
534	ret
535	ENDPROC SVMGCVMRun64
536
537	;/**
538	; * Saves the guest FPU context
539	; *
540	; * @returns VBox status code
541	; * @param pCtx Guest context [rsi]
542	; */
543	BEGINPROC HWACCMSaveGuestFPU64
544	mov rax, cr0
545	mov rcx, rax ; save old CR0
546	and rax, ~(X86_CR0_TS \| X86_CR0_EM)
547	mov cr0, rax
548
549	fxsave [rsi + CPUMCTX.fpu]
550
551	mov cr0, rcx ; and restore old CR0 again
552
553	mov eax, VINF_SUCCESS
554	ret
555	ENDPROC HWACCMSaveGuestFPU64
556
557	;/**
558	; * Saves the guest debug context (DR0-3, DR6)
559	; *
560	; * @returns VBox status code
561	; * @param pCtx Guest context [rsi]
562	; */
563	BEGINPROC HWACCMSaveGuestDebug64
564	mov rax, dr0
565	mov qword [rsi + CPUMCTX.dr + 0*8], rax
566	mov rax, dr1
567	mov qword [rsi + CPUMCTX.dr + 1*8], rax
568	mov rax, dr2
569	mov qword [rsi + CPUMCTX.dr + 2*8], rax
570	mov rax, dr3
571	mov qword [rsi + CPUMCTX.dr + 3*8], rax
572	mov rax, dr6
573	mov qword [rsi + CPUMCTX.dr + 6*8], rax
574	mov eax, VINF_SUCCESS
575	ret
576	ENDPROC HWACCMSaveGuestDebug64
577
578	;/**
579	; * Dummy callback handler
580	; *
581	; * @returns VBox status code
582	; * @param param1 Parameter 1 [rsp+8]
583	; * @param param2 Parameter 2 [rsp+12]
584	; * @param param3 Parameter 3 [rsp+16]
585	; * @param param4 Parameter 4 [rsp+20]
586	; * @param param5 Parameter 5 [rsp+24]
587	; * @param pCtx Guest context [rsi]
588	; */
589	BEGINPROC HWACCMTestSwitcher64
590	mov eax, [rsp+8]
591	ret
592	ENDPROC HWACCMTestSwitcher64

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/VMM/VMMGC/HWACCMGCA.asm@ 19032

Download in other formats: