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KVM: x86 emulator: move interruptibility state tracking out of emulator

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Emulator shouldn't access vcpu directly.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2010-04-28 19:15:43 +03:00 committed by Avi Kivity
parent 4d2179e1e9
commit 95cb229530
2 changed files with 19 additions and 20 deletions
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19
arch/x86/kvm/emulate.c
View File

@ -1843,20 +1843,6 @@ static inline int writeback(struct x86_emulate_ctxt *ctxt,
return X86EMUL_CONTINUE;
}
static void toggle_interruptibility(struct x86_emulate_ctxt *ctxt, u32 mask)
{
u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(ctxt->vcpu, mask);
/*
* an sti; sti; sequence only disable interrupts for the first
* instruction. So, if the last instruction, be it emulated or
* not, left the system with the INT_STI flag enabled, it
* means that the last instruction is an sti. We should not
* leave the flag on in this case. The same goes for mov ss
*/
if (!(int_shadow & mask))
ctxt->interruptibility = mask;
}
static inline void
setup_syscalls_segments(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops, struct desc_struct *cs,
@ -2516,7 +2502,6 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
int rc = X86EMUL_CONTINUE;
int saved_dst_type = c->dst.type;
ctxt->interruptibility = 0;
ctxt->decode.mem_read.pos = 0;
if (ctxt->mode == X86EMUL_MODE_PROT64 && (c->d & No64)) {
@ -2789,7 +2774,7 @@ special_insn:
}
if (c->modrm_reg == VCPU_SREG_SS)
toggle_interruptibility(ctxt, KVM_X86_SHADOW_INT_MOV_SS);
ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS;
rc = load_segment_descriptor(ctxt, ops, sel, c->modrm_reg);
@ -2958,7 +2943,7 @@ special_insn:
if (emulator_bad_iopl(ctxt, ops))
kvm_inject_gp(ctxt->vcpu, 0);
else {
toggle_interruptibility(ctxt, KVM_X86_SHADOW_INT_STI);
ctxt->interruptibility = KVM_X86_SHADOW_INT_STI;
ctxt->eflags |= X86_EFLAGS_IF;
c->dst.type = OP_NONE; /* Disable writeback. */
}

20
arch/x86/kvm/x86.c
View File

@ -3838,12 +3838,26 @@ static void cache_all_regs(struct kvm_vcpu *vcpu)
vcpu->arch.regs_dirty = ~0;
}
static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
{
u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu, mask);
/*
* an sti; sti; sequence only disable interrupts for the first
* instruction. So, if the last instruction, be it emulated or
* not, left the system with the INT_STI flag enabled, it
* means that the last instruction is an sti. We should not
* leave the flag on in this case. The same goes for mov ss
*/
if (!(int_shadow & mask))
kvm_x86_ops->set_interrupt_shadow(vcpu, mask);
}
int emulate_instruction(struct kvm_vcpu *vcpu,
unsigned long cr2,
u16 error_code,
int emulation_type)
{
int r, shadow_mask;
int r;
struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
kvm_clear_exception_queue(vcpu);
@ -3871,6 +3885,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
memset(c, 0, sizeof(struct decode_cache));
memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
vcpu->arch.emulate_ctxt.interruptibility = 0;
r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
trace_kvm_emulate_insn_start(vcpu);
@ -3938,8 +3953,7 @@ restart:
return EMULATE_FAIL;
}
shadow_mask = vcpu->arch.emulate_ctxt.interruptibility;
kvm_x86_ops->set_interrupt_shadow(vcpu, shadow_mask);
toggle_interruptibility(vcpu, vcpu->arch.emulate_ctxt.interruptibility);
kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);