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KVM: VMX: Modify mode switching and vmentry functions

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This patch modifies mode switching and vmentry function in order to
drive invalid guest state emulation.

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Mohammed Gamal 2008-08-17 16:42:16 +03:00 • committed by Avi Kivity
parent ea953ef0ca
commit a89a8fb93b
1 changed files with 20 additions and 0 deletions
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20
arch/x86/kvm/vmx.c
View file

@ -1298,7 +1298,9 @@ static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
static void enter_pmode(struct kvm_vcpu *vcpu) static void enter_pmode(struct kvm_vcpu *vcpu)
{ {
unsigned long flags; unsigned long flags;
struct vcpu_vmx *vmx = to_vmx(vcpu);
vmx->emulation_required = 1;
vcpu->arch.rmode.active = 0; vcpu->arch.rmode.active = 0;
vmcs_writel(GUEST_TR_BASE, vcpu->arch.rmode.tr.base); vmcs_writel(GUEST_TR_BASE, vcpu->arch.rmode.tr.base);
@ -1315,6 +1317,9 @@ static void enter_pmode(struct kvm_vcpu *vcpu)
update_exception_bitmap(vcpu); update_exception_bitmap(vcpu);
if (emulate_invalid_guest_state)
return;
fix_pmode_dataseg(VCPU_SREG_ES, &vcpu->arch.rmode.es); fix_pmode_dataseg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
fix_pmode_dataseg(VCPU_SREG_DS, &vcpu->arch.rmode.ds); fix_pmode_dataseg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
fix_pmode_dataseg(VCPU_SREG_GS, &vcpu->arch.rmode.gs); fix_pmode_dataseg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
@ -1355,7 +1360,9 @@ static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
static void enter_rmode(struct kvm_vcpu *vcpu) static void enter_rmode(struct kvm_vcpu *vcpu)
{ {
unsigned long flags; unsigned long flags;
struct vcpu_vmx *vmx = to_vmx(vcpu);
vmx->emulation_required = 1;
vcpu->arch.rmode.active = 1; vcpu->arch.rmode.active = 1;
vcpu->arch.rmode.tr.base = vmcs_readl(GUEST_TR_BASE); vcpu->arch.rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
@ -1377,6 +1384,9 @@ static void enter_rmode(struct kvm_vcpu *vcpu)
vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME); vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
update_exception_bitmap(vcpu); update_exception_bitmap(vcpu);
if (emulate_invalid_guest_state)
goto continue_rmode;
vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4); vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
vmcs_write32(GUEST_SS_LIMIT, 0xffff); vmcs_write32(GUEST_SS_LIMIT, 0xffff);
vmcs_write32(GUEST_SS_AR_BYTES, 0xf3); vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
@ -1392,6 +1402,7 @@ static void enter_rmode(struct kvm_vcpu *vcpu)
fix_rmode_seg(VCPU_SREG_GS, &vcpu->arch.rmode.gs); fix_rmode_seg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
fix_rmode_seg(VCPU_SREG_FS, &vcpu->arch.rmode.fs); fix_rmode_seg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
continue_rmode:
kvm_mmu_reset_context(vcpu); kvm_mmu_reset_context(vcpu);
init_rmode(vcpu->kvm); init_rmode(vcpu->kvm);
} }
@ -2317,6 +2328,9 @@ static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
ret = 0; ret = 0;
/* HACK: Don't enable emulation on guest boot/reset */
vmx->emulation_required = 0;
out: out:
up_read(&vcpu->kvm->slots_lock); up_read(&vcpu->kvm->slots_lock);
return ret; return ret;
@ -3190,6 +3204,12 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
struct vcpu_vmx *vmx = to_vmx(vcpu); struct vcpu_vmx *vmx = to_vmx(vcpu);
u32 intr_info; u32 intr_info;
/* Handle invalid guest state instead of entering VMX */
if (vmx->emulation_required && emulate_invalid_guest_state) {
handle_invalid_guest_state(vcpu, kvm_run);
return;
}
if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty)) if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]); vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty)) if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))