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qemu/target/i386/svm_helper.c
Alexander Boettcher a2d57703b3 tcg/svm: use host cr4 during NPT page table walk 
During a page table walk of TCG+SVM the code in target/i386/excp_helper.c
get_hphys() uses the cr4 register of the guest instead of the hypervisor
to check for the PSE bit. In the test case we have, the guest have not
enabled (yet) the PSE bit and so the page table walk results in a wrong
host physical address resolution and wrong content read by the guest.

Attached patch is against 4.2.1, but works also on 3.1.0. It fixes the
issue for our automated testcase, which is a 32bit hypervisor w/o PAE
support running a guest VM with tcg+svm.

The test worked beforehand up to qemu 2.12, started to fail with qemu 3.0
and later. The added TCG/SVM NPT commit seems to introduce the regression.

In case someone want to try to reproduce it, the iso is at [0], the good
case is [1] and the failing case is [2]. The used commandline is:

qemu-system-i386 -no-kvm -nographic -cpu phenom -m 512 -machine q35 -cdrom seoul-vmm-test.iso

[0] https://depot.genode.org/alex-ab/images/seoul-vmm-test.iso
[1] https://depot.genode.org/alex-ab/images/seoul-vmm-good.txt
[2] https://depot.genode.org/alex-ab/images/seoul-vmm-bad.txt

Signed-off-by: Alexander Boettcher <alexander.boettcher@genode-labs.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-07-10 18:02:14 -04:00

801 lines
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/*
* x86 SVM helpers
*
* Copyright (c) 2003 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/helper-proto.h"
#include "exec/exec-all.h"
#include "exec/cpu_ldst.h"
/* Secure Virtual Machine helpers */
#if defined(CONFIG_USER_ONLY)
void helper_vmrun(CPUX86State *env, int aflag, int next_eip_addend)
{
}
void helper_vmmcall(CPUX86State *env)
{
}
void helper_vmload(CPUX86State *env, int aflag)
{
}
void helper_vmsave(CPUX86State *env, int aflag)
{
}
void helper_stgi(CPUX86State *env)
{
}
void helper_clgi(CPUX86State *env)
{
}
void helper_skinit(CPUX86State *env)
{
}
void helper_invlpga(CPUX86State *env, int aflag)
{
}
void cpu_vmexit(CPUX86State *nenv, uint32_t exit_code, uint64_t exit_info_1,
uintptr_t retaddr)
{
assert(0);
}
void helper_svm_check_intercept_param(CPUX86State *env, uint32_t type,
uint64_t param)
{
}
void cpu_svm_check_intercept_param(CPUX86State *env, uint32_t type,
uint64_t param, uintptr_t retaddr)
{
}
void helper_svm_check_io(CPUX86State *env, uint32_t port, uint32_t param,
uint32_t next_eip_addend)
{
}
#else
static inline void svm_save_seg(CPUX86State *env, hwaddr addr,
const SegmentCache *sc)
{
CPUState *cs = env_cpu(env);
x86_stw_phys(cs, addr + offsetof(struct vmcb_seg, selector),
sc->selector);
x86_stq_phys(cs, addr + offsetof(struct vmcb_seg, base),
sc->base);
x86_stl_phys(cs, addr + offsetof(struct vmcb_seg, limit),
sc->limit);
x86_stw_phys(cs, addr + offsetof(struct vmcb_seg, attrib),
((sc->flags >> 8) & 0xff) | ((sc->flags >> 12) & 0x0f00));
}
static inline void svm_load_seg(CPUX86State *env, hwaddr addr,
SegmentCache *sc)
{
CPUState *cs = env_cpu(env);
unsigned int flags;
sc->selector = x86_lduw_phys(cs,
addr + offsetof(struct vmcb_seg, selector));
sc->base = x86_ldq_phys(cs, addr + offsetof(struct vmcb_seg, base));
sc->limit = x86_ldl_phys(cs, addr + offsetof(struct vmcb_seg, limit));
flags = x86_lduw_phys(cs, addr + offsetof(struct vmcb_seg, attrib));
sc->flags = ((flags & 0xff) << 8) | ((flags & 0x0f00) << 12);
}
static inline void svm_load_seg_cache(CPUX86State *env, hwaddr addr,
int seg_reg)
{
SegmentCache sc1, *sc = &sc1;
svm_load_seg(env, addr, sc);
cpu_x86_load_seg_cache(env, seg_reg, sc->selector,
sc->base, sc->limit, sc->flags);
}
void helper_vmrun(CPUX86State *env, int aflag, int next_eip_addend)
{
CPUState *cs = env_cpu(env);
target_ulong addr;
uint64_t nested_ctl;
uint32_t event_inj;
uint32_t int_ctl;
cpu_svm_check_intercept_param(env, SVM_EXIT_VMRUN, 0, GETPC());
if (aflag == 2) {
addr = env->regs[R_EAX];
} else {
addr = (uint32_t)env->regs[R_EAX];
}
qemu_log_mask(CPU_LOG_TB_IN_ASM, "vmrun! " TARGET_FMT_lx "\n", addr);
env->vm_vmcb = addr;
/* save the current CPU state in the hsave page */
x86_stq_phys(cs, env->vm_hsave + offsetof(struct vmcb, save.gdtr.base),
env->gdt.base);
x86_stl_phys(cs, env->vm_hsave + offsetof(struct vmcb, save.gdtr.limit),
env->gdt.limit);
x86_stq_phys(cs, env->vm_hsave + offsetof(struct vmcb, save.idtr.base),
env->idt.base);
x86_stl_phys(cs, env->vm_hsave + offsetof(struct vmcb, save.idtr.limit),
env->idt.limit);
x86_stq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.cr0), env->cr[0]);
x86_stq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.cr2), env->cr[2]);
x86_stq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.cr3), env->cr[3]);
x86_stq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.cr4), env->cr[4]);
x86_stq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.dr6), env->dr[6]);
x86_stq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.dr7), env->dr[7]);
x86_stq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.efer), env->efer);
x86_stq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.rflags),
cpu_compute_eflags(env));
svm_save_seg(env, env->vm_hsave + offsetof(struct vmcb, save.es),
&env->segs[R_ES]);
svm_save_seg(env, env->vm_hsave + offsetof(struct vmcb, save.cs),
&env->segs[R_CS]);
svm_save_seg(env, env->vm_hsave + offsetof(struct vmcb, save.ss),
&env->segs[R_SS]);
svm_save_seg(env, env->vm_hsave + offsetof(struct vmcb, save.ds),
&env->segs[R_DS]);
x86_stq_phys(cs, env->vm_hsave + offsetof(struct vmcb, save.rip),
env->eip + next_eip_addend);
x86_stq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.rsp), env->regs[R_ESP]);
x86_stq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.rax), env->regs[R_EAX]);
/* load the interception bitmaps so we do not need to access the
vmcb in svm mode */
env->intercept = x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
control.intercept));
env->intercept_cr_read = x86_lduw_phys(cs, env->vm_vmcb +
offsetof(struct vmcb,
control.intercept_cr_read));
env->intercept_cr_write = x86_lduw_phys(cs, env->vm_vmcb +
offsetof(struct vmcb,
control.intercept_cr_write));
env->intercept_dr_read = x86_lduw_phys(cs, env->vm_vmcb +
offsetof(struct vmcb,
control.intercept_dr_read));
env->intercept_dr_write = x86_lduw_phys(cs, env->vm_vmcb +
offsetof(struct vmcb,
control.intercept_dr_write));
env->intercept_exceptions = x86_ldl_phys(cs, env->vm_vmcb +
offsetof(struct vmcb,
control.intercept_exceptions
));
nested_ctl = x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
control.nested_ctl));
env->nested_pg_mode = 0;
if (nested_ctl & SVM_NPT_ENABLED) {
env->nested_cr3 = x86_ldq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb,
control.nested_cr3));
env->hflags2 |= HF2_NPT_MASK;
if (env->cr[4] & CR4_PAE_MASK) {
env->nested_pg_mode |= SVM_NPT_PAE;
}
if (env->cr[4] & CR4_PSE_MASK) {
env->nested_pg_mode |= SVM_NPT_PSE;
}
if (env->hflags & HF_LMA_MASK) {
env->nested_pg_mode |= SVM_NPT_LMA;
}
if (env->efer & MSR_EFER_NXE) {
env->nested_pg_mode |= SVM_NPT_NXE;
}
}
/* enable intercepts */
env->hflags |= HF_GUEST_MASK;
env->tsc_offset = x86_ldq_phys(cs, env->vm_vmcb +
offsetof(struct vmcb, control.tsc_offset));
env->gdt.base = x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
save.gdtr.base));
env->gdt.limit = x86_ldl_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
save.gdtr.limit));
env->idt.base = x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
save.idtr.base));
env->idt.limit = x86_ldl_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
save.idtr.limit));
/* clear exit_info_2 so we behave like the real hardware */
x86_stq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, control.exit_info_2), 0);
cpu_x86_update_cr0(env, x86_ldq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb,
save.cr0)));
cpu_x86_update_cr4(env, x86_ldq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb,
save.cr4)));
cpu_x86_update_cr3(env, x86_ldq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb,
save.cr3)));
env->cr[2] = x86_ldq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.cr2));
int_ctl = x86_ldl_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, control.int_ctl));
env->hflags2 &= ~(HF2_HIF_MASK | HF2_VINTR_MASK);
if (int_ctl & V_INTR_MASKING_MASK) {
env->v_tpr = int_ctl & V_TPR_MASK;
env->hflags2 |= HF2_VINTR_MASK;
if (env->eflags & IF_MASK) {
env->hflags2 |= HF2_HIF_MASK;
}
}
cpu_load_efer(env,
x86_ldq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.efer)));
env->eflags = 0;
cpu_load_eflags(env, x86_ldq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb,
save.rflags)),
~(CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C | DF_MASK));
svm_load_seg_cache(env, env->vm_vmcb + offsetof(struct vmcb, save.es),
R_ES);
svm_load_seg_cache(env, env->vm_vmcb + offsetof(struct vmcb, save.cs),
R_CS);
svm_load_seg_cache(env, env->vm_vmcb + offsetof(struct vmcb, save.ss),
R_SS);
svm_load_seg_cache(env, env->vm_vmcb + offsetof(struct vmcb, save.ds),
R_DS);
env->eip = x86_ldq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.rip));
env->regs[R_ESP] = x86_ldq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.rsp));
env->regs[R_EAX] = x86_ldq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.rax));
env->dr[7] = x86_ldq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.dr7));
env->dr[6] = x86_ldq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.dr6));
/* FIXME: guest state consistency checks */
switch (x86_ldub_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, control.tlb_ctl))) {
case TLB_CONTROL_DO_NOTHING:
break;
case TLB_CONTROL_FLUSH_ALL_ASID:
/* FIXME: this is not 100% correct but should work for now */
tlb_flush(cs);
break;
}
env->hflags2 |= HF2_GIF_MASK;
if (int_ctl & V_IRQ_MASK) {
CPUState *cs = env_cpu(env);
cs->interrupt_request |= CPU_INTERRUPT_VIRQ;
}
/* maybe we need to inject an event */
event_inj = x86_ldl_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
control.event_inj));
if (event_inj & SVM_EVTINJ_VALID) {
uint8_t vector = event_inj & SVM_EVTINJ_VEC_MASK;
uint16_t valid_err = event_inj & SVM_EVTINJ_VALID_ERR;
uint32_t event_inj_err = x86_ldl_phys(cs, env->vm_vmcb +
offsetof(struct vmcb,
control.event_inj_err));
qemu_log_mask(CPU_LOG_TB_IN_ASM, "Injecting(%#hx): ", valid_err);
/* FIXME: need to implement valid_err */
switch (event_inj & SVM_EVTINJ_TYPE_MASK) {
case SVM_EVTINJ_TYPE_INTR:
cs->exception_index = vector;
env->error_code = event_inj_err;
env->exception_is_int = 0;
env->exception_next_eip = -1;
qemu_log_mask(CPU_LOG_TB_IN_ASM, "INTR");
/* XXX: is it always correct? */
do_interrupt_x86_hardirq(env, vector, 1);
break;
case SVM_EVTINJ_TYPE_NMI:
cs->exception_index = EXCP02_NMI;
env->error_code = event_inj_err;
env->exception_is_int = 0;
env->exception_next_eip = env->eip;
qemu_log_mask(CPU_LOG_TB_IN_ASM, "NMI");
cpu_loop_exit(cs);
break;
case SVM_EVTINJ_TYPE_EXEPT:
cs->exception_index = vector;
env->error_code = event_inj_err;
env->exception_is_int = 0;
env->exception_next_eip = -1;
qemu_log_mask(CPU_LOG_TB_IN_ASM, "EXEPT");
cpu_loop_exit(cs);
break;
case SVM_EVTINJ_TYPE_SOFT:
cs->exception_index = vector;
env->error_code = event_inj_err;
env->exception_is_int = 1;
env->exception_next_eip = env->eip;
qemu_log_mask(CPU_LOG_TB_IN_ASM, "SOFT");
cpu_loop_exit(cs);
break;
}
qemu_log_mask(CPU_LOG_TB_IN_ASM, " %#x %#x\n", cs->exception_index,
env->error_code);
}
}
void helper_vmmcall(CPUX86State *env)
{
cpu_svm_check_intercept_param(env, SVM_EXIT_VMMCALL, 0, GETPC());
raise_exception(env, EXCP06_ILLOP);
}
void helper_vmload(CPUX86State *env, int aflag)
{
CPUState *cs = env_cpu(env);
target_ulong addr;
cpu_svm_check_intercept_param(env, SVM_EXIT_VMLOAD, 0, GETPC());
if (aflag == 2) {
addr = env->regs[R_EAX];
} else {
addr = (uint32_t)env->regs[R_EAX];
}
qemu_log_mask(CPU_LOG_TB_IN_ASM, "vmload! " TARGET_FMT_lx
"\nFS: %016" PRIx64 " | " TARGET_FMT_lx "\n",
addr, x86_ldq_phys(cs, addr + offsetof(struct vmcb,
save.fs.base)),
env->segs[R_FS].base);
svm_load_seg_cache(env, addr + offsetof(struct vmcb, save.fs), R_FS);
svm_load_seg_cache(env, addr + offsetof(struct vmcb, save.gs), R_GS);
svm_load_seg(env, addr + offsetof(struct vmcb, save.tr), &env->tr);
svm_load_seg(env, addr + offsetof(struct vmcb, save.ldtr), &env->ldt);
#ifdef TARGET_X86_64
env->kernelgsbase = x86_ldq_phys(cs, addr + offsetof(struct vmcb,
save.kernel_gs_base));
env->lstar = x86_ldq_phys(cs, addr + offsetof(struct vmcb, save.lstar));
env->cstar = x86_ldq_phys(cs, addr + offsetof(struct vmcb, save.cstar));
env->fmask = x86_ldq_phys(cs, addr + offsetof(struct vmcb, save.sfmask));
#endif
env->star = x86_ldq_phys(cs, addr + offsetof(struct vmcb, save.star));
env->sysenter_cs = x86_ldq_phys(cs,
addr + offsetof(struct vmcb, save.sysenter_cs));
env->sysenter_esp = x86_ldq_phys(cs, addr + offsetof(struct vmcb,
save.sysenter_esp));
env->sysenter_eip = x86_ldq_phys(cs, addr + offsetof(struct vmcb,
save.sysenter_eip));
}
void helper_vmsave(CPUX86State *env, int aflag)
{
CPUState *cs = env_cpu(env);
target_ulong addr;
cpu_svm_check_intercept_param(env, SVM_EXIT_VMSAVE, 0, GETPC());
if (aflag == 2) {
addr = env->regs[R_EAX];
} else {
addr = (uint32_t)env->regs[R_EAX];
}
qemu_log_mask(CPU_LOG_TB_IN_ASM, "vmsave! " TARGET_FMT_lx
"\nFS: %016" PRIx64 " | " TARGET_FMT_lx "\n",
addr, x86_ldq_phys(cs,
addr + offsetof(struct vmcb, save.fs.base)),
env->segs[R_FS].base);
svm_save_seg(env, addr + offsetof(struct vmcb, save.fs),
&env->segs[R_FS]);
svm_save_seg(env, addr + offsetof(struct vmcb, save.gs),
&env->segs[R_GS]);
svm_save_seg(env, addr + offsetof(struct vmcb, save.tr),
&env->tr);
svm_save_seg(env, addr + offsetof(struct vmcb, save.ldtr),
&env->ldt);
#ifdef TARGET_X86_64
x86_stq_phys(cs, addr + offsetof(struct vmcb, save.kernel_gs_base),
env->kernelgsbase);
x86_stq_phys(cs, addr + offsetof(struct vmcb, save.lstar), env->lstar);
x86_stq_phys(cs, addr + offsetof(struct vmcb, save.cstar), env->cstar);
x86_stq_phys(cs, addr + offsetof(struct vmcb, save.sfmask), env->fmask);
#endif
x86_stq_phys(cs, addr + offsetof(struct vmcb, save.star), env->star);
x86_stq_phys(cs,
addr + offsetof(struct vmcb, save.sysenter_cs), env->sysenter_cs);
x86_stq_phys(cs, addr + offsetof(struct vmcb, save.sysenter_esp),
env->sysenter_esp);
x86_stq_phys(cs, addr + offsetof(struct vmcb, save.sysenter_eip),
env->sysenter_eip);
}
void helper_stgi(CPUX86State *env)
{
cpu_svm_check_intercept_param(env, SVM_EXIT_STGI, 0, GETPC());
env->hflags2 |= HF2_GIF_MASK;
}
void helper_clgi(CPUX86State *env)
{
cpu_svm_check_intercept_param(env, SVM_EXIT_CLGI, 0, GETPC());
env->hflags2 &= ~HF2_GIF_MASK;
}
void helper_skinit(CPUX86State *env)
{
cpu_svm_check_intercept_param(env, SVM_EXIT_SKINIT, 0, GETPC());
/* XXX: not implemented */
raise_exception(env, EXCP06_ILLOP);
}
void helper_invlpga(CPUX86State *env, int aflag)
{
X86CPU *cpu = env_archcpu(env);
target_ulong addr;
cpu_svm_check_intercept_param(env, SVM_EXIT_INVLPGA, 0, GETPC());
if (aflag == 2) {
addr = env->regs[R_EAX];
} else {
addr = (uint32_t)env->regs[R_EAX];
}
/* XXX: could use the ASID to see if it is needed to do the
flush */
tlb_flush_page(CPU(cpu), addr);
}
void cpu_svm_check_intercept_param(CPUX86State *env, uint32_t type,
uint64_t param, uintptr_t retaddr)
{
CPUState *cs = env_cpu(env);
if (likely(!(env->hflags & HF_GUEST_MASK))) {
return;
}
switch (type) {
case SVM_EXIT_READ_CR0 ... SVM_EXIT_READ_CR0 + 8:
if (env->intercept_cr_read & (1 << (type - SVM_EXIT_READ_CR0))) {
cpu_vmexit(env, type, param, retaddr);
}
break;
case SVM_EXIT_WRITE_CR0 ... SVM_EXIT_WRITE_CR0 + 8:
if (env->intercept_cr_write & (1 << (type - SVM_EXIT_WRITE_CR0))) {
cpu_vmexit(env, type, param, retaddr);
}
break;
case SVM_EXIT_READ_DR0 ... SVM_EXIT_READ_DR0 + 7:
if (env->intercept_dr_read & (1 << (type - SVM_EXIT_READ_DR0))) {
cpu_vmexit(env, type, param, retaddr);
}
break;
case SVM_EXIT_WRITE_DR0 ... SVM_EXIT_WRITE_DR0 + 7:
if (env->intercept_dr_write & (1 << (type - SVM_EXIT_WRITE_DR0))) {
cpu_vmexit(env, type, param, retaddr);
}
break;
case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 31:
if (env->intercept_exceptions & (1 << (type - SVM_EXIT_EXCP_BASE))) {
cpu_vmexit(env, type, param, retaddr);
}
break;
case SVM_EXIT_MSR:
if (env->intercept & (1ULL << (SVM_EXIT_MSR - SVM_EXIT_INTR))) {
/* FIXME: this should be read in at vmrun (faster this way?) */
uint64_t addr = x86_ldq_phys(cs, env->vm_vmcb +
offsetof(struct vmcb,
control.msrpm_base_pa));
uint32_t t0, t1;
switch ((uint32_t)env->regs[R_ECX]) {
case 0 ... 0x1fff:
t0 = (env->regs[R_ECX] * 2) % 8;
t1 = (env->regs[R_ECX] * 2) / 8;
break;
case 0xc0000000 ... 0xc0001fff:
t0 = (8192 + env->regs[R_ECX] - 0xc0000000) * 2;
t1 = (t0 / 8);
t0 %= 8;
break;
case 0xc0010000 ... 0xc0011fff:
t0 = (16384 + env->regs[R_ECX] - 0xc0010000) * 2;
t1 = (t0 / 8);
t0 %= 8;
break;
default:
cpu_vmexit(env, type, param, retaddr);
t0 = 0;
t1 = 0;
break;
}
if (x86_ldub_phys(cs, addr + t1) & ((1 << param) << t0)) {
cpu_vmexit(env, type, param, retaddr);
}
}
break;
default:
if (env->intercept & (1ULL << (type - SVM_EXIT_INTR))) {
cpu_vmexit(env, type, param, retaddr);
}
break;
}
}
void helper_svm_check_intercept_param(CPUX86State *env, uint32_t type,
uint64_t param)
{
cpu_svm_check_intercept_param(env, type, param, GETPC());
}
void helper_svm_check_io(CPUX86State *env, uint32_t port, uint32_t param,
uint32_t next_eip_addend)
{
CPUState *cs = env_cpu(env);
if (env->intercept & (1ULL << (SVM_EXIT_IOIO - SVM_EXIT_INTR))) {
/* FIXME: this should be read in at vmrun (faster this way?) */
uint64_t addr = x86_ldq_phys(cs, env->vm_vmcb +
offsetof(struct vmcb, control.iopm_base_pa));
uint16_t mask = (1 << ((param >> 4) & 7)) - 1;
if (x86_lduw_phys(cs, addr + port / 8) & (mask << (port & 7))) {
/* next env->eip */
x86_stq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, control.exit_info_2),
env->eip + next_eip_addend);
cpu_vmexit(env, SVM_EXIT_IOIO, param | (port << 16), GETPC());
}
}
}
void cpu_vmexit(CPUX86State *env, uint32_t exit_code, uint64_t exit_info_1,
uintptr_t retaddr)
{
CPUState *cs = env_cpu(env);
cpu_restore_state(cs, retaddr, true);
qemu_log_mask(CPU_LOG_TB_IN_ASM, "vmexit(%08x, %016" PRIx64 ", %016"
PRIx64 ", " TARGET_FMT_lx ")!\n",
exit_code, exit_info_1,
x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
control.exit_info_2)),
env->eip);
cs->exception_index = EXCP_VMEXIT + exit_code;
env->error_code = exit_info_1;
/* remove any pending exception */
env->old_exception = -1;
cpu_loop_exit(cs);
}
void do_vmexit(CPUX86State *env, uint32_t exit_code, uint64_t exit_info_1)
{
CPUState *cs = env_cpu(env);
uint32_t int_ctl;
if (env->hflags & HF_INHIBIT_IRQ_MASK) {
x86_stl_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, control.int_state),
SVM_INTERRUPT_SHADOW_MASK);
env->hflags &= ~HF_INHIBIT_IRQ_MASK;
} else {
x86_stl_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, control.int_state), 0);
}
env->hflags2 &= ~HF2_NPT_MASK;
/* Save the VM state in the vmcb */
svm_save_seg(env, env->vm_vmcb + offsetof(struct vmcb, save.es),
&env->segs[R_ES]);
svm_save_seg(env, env->vm_vmcb + offsetof(struct vmcb, save.cs),
&env->segs[R_CS]);
svm_save_seg(env, env->vm_vmcb + offsetof(struct vmcb, save.ss),
&env->segs[R_SS]);
svm_save_seg(env, env->vm_vmcb + offsetof(struct vmcb, save.ds),
&env->segs[R_DS]);
x86_stq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, save.gdtr.base),
env->gdt.base);
x86_stl_phys(cs, env->vm_vmcb + offsetof(struct vmcb, save.gdtr.limit),
env->gdt.limit);
x86_stq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, save.idtr.base),
env->idt.base);
x86_stl_phys(cs, env->vm_vmcb + offsetof(struct vmcb, save.idtr.limit),
env->idt.limit);
x86_stq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.efer), env->efer);
x86_stq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.cr0), env->cr[0]);
x86_stq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.cr2), env->cr[2]);
x86_stq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.cr3), env->cr[3]);
x86_stq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.cr4), env->cr[4]);
int_ctl = x86_ldl_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, control.int_ctl));
int_ctl &= ~(V_TPR_MASK | V_IRQ_MASK);
int_ctl |= env->v_tpr & V_TPR_MASK;
if (cs->interrupt_request & CPU_INTERRUPT_VIRQ) {
int_ctl |= V_IRQ_MASK;
}
x86_stl_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, control.int_ctl), int_ctl);
x86_stq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, save.rflags),
cpu_compute_eflags(env));
x86_stq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, save.rip),
env->eip);
x86_stq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.rsp), env->regs[R_ESP]);
x86_stq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.rax), env->regs[R_EAX]);
x86_stq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.dr7), env->dr[7]);
x86_stq_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, save.dr6), env->dr[6]);
x86_stb_phys(cs, env->vm_vmcb + offsetof(struct vmcb, save.cpl),
env->hflags & HF_CPL_MASK);
/* Reload the host state from vm_hsave */
env->hflags2 &= ~(HF2_HIF_MASK | HF2_VINTR_MASK);
env->hflags &= ~HF_GUEST_MASK;
env->intercept = 0;
env->intercept_exceptions = 0;
cs->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
env->tsc_offset = 0;
env->gdt.base = x86_ldq_phys(cs, env->vm_hsave + offsetof(struct vmcb,
save.gdtr.base));
env->gdt.limit = x86_ldl_phys(cs, env->vm_hsave + offsetof(struct vmcb,
save.gdtr.limit));
env->idt.base = x86_ldq_phys(cs, env->vm_hsave + offsetof(struct vmcb,
save.idtr.base));
env->idt.limit = x86_ldl_phys(cs, env->vm_hsave + offsetof(struct vmcb,
save.idtr.limit));
cpu_x86_update_cr0(env, x86_ldq_phys(cs,
env->vm_hsave + offsetof(struct vmcb,
save.cr0)) |
CR0_PE_MASK);
cpu_x86_update_cr4(env, x86_ldq_phys(cs,
env->vm_hsave + offsetof(struct vmcb,
save.cr4)));
cpu_x86_update_cr3(env, x86_ldq_phys(cs,
env->vm_hsave + offsetof(struct vmcb,
save.cr3)));
/* we need to set the efer after the crs so the hidden flags get
set properly */
cpu_load_efer(env, x86_ldq_phys(cs, env->vm_hsave + offsetof(struct vmcb,
save.efer)));
env->eflags = 0;
cpu_load_eflags(env, x86_ldq_phys(cs,
env->vm_hsave + offsetof(struct vmcb,
save.rflags)),
~(CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C | DF_MASK |
VM_MASK));
svm_load_seg_cache(env, env->vm_hsave + offsetof(struct vmcb, save.es),
R_ES);
svm_load_seg_cache(env, env->vm_hsave + offsetof(struct vmcb, save.cs),
R_CS);
svm_load_seg_cache(env, env->vm_hsave + offsetof(struct vmcb, save.ss),
R_SS);
svm_load_seg_cache(env, env->vm_hsave + offsetof(struct vmcb, save.ds),
R_DS);
env->eip = x86_ldq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.rip));
env->regs[R_ESP] = x86_ldq_phys(cs, env->vm_hsave +
offsetof(struct vmcb, save.rsp));
env->regs[R_EAX] = x86_ldq_phys(cs, env->vm_hsave +
offsetof(struct vmcb, save.rax));
env->dr[6] = x86_ldq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.dr6));
env->dr[7] = x86_ldq_phys(cs,
env->vm_hsave + offsetof(struct vmcb, save.dr7));
/* other setups */
x86_stq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, control.exit_code),
exit_code);
x86_stq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, control.exit_info_1),
exit_info_1);
x86_stl_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, control.exit_int_info),
x86_ldl_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
control.event_inj)));
x86_stl_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, control.exit_int_info_err),
x86_ldl_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
control.event_inj_err)));
x86_stl_phys(cs,
env->vm_vmcb + offsetof(struct vmcb, control.event_inj), 0);
env->hflags2 &= ~HF2_GIF_MASK;
/* FIXME: Resets the current ASID register to zero (host ASID). */
/* Clears the V_IRQ and V_INTR_MASKING bits inside the processor. */
/* Clears the TSC_OFFSET inside the processor. */
/* If the host is in PAE mode, the processor reloads the host's PDPEs
from the page table indicated the host's CR3. If the PDPEs contain
illegal state, the processor causes a shutdown. */
/* Disables all breakpoints in the host DR7 register. */
/* Checks the reloaded host state for consistency. */
/* If the host's rIP reloaded by #VMEXIT is outside the limit of the
host's code segment or non-canonical (in the case of long mode), a
#GP fault is delivered inside the host. */
}
#endif
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