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KVM: Separate emulation context initialization in a separate function 

The code for initializing the emulation context is duplicated at two
locations (emulate_instruction() and kvm_task_switch()). Separate it
in a separate function and call it from there.

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Mohammed Gamal 2010-08-16 00:47:01 +03:00 committed by Avi Kivity
parent d9574a25af
commit 8ec4722dd2
1 changed files with 25 additions and 29 deletions
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54
arch/x86/kvm/x86.c
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@ -3931,6 +3931,28 @@ static void inject_emulated_exception(struct kvm_vcpu *vcpu)
kvm_queue_exception(vcpu, ctxt->exception);
}
static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
{
struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
int cs_db, cs_l;
cache_all_regs(vcpu);
kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
vcpu->arch.emulate_ctxt.vcpu = vcpu;
vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);
vcpu->arch.emulate_ctxt.mode =
(!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
(vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
? X86EMUL_MODE_VM86 : cs_l
? X86EMUL_MODE_PROT64 : cs_db
? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
memset(c, 0, sizeof(struct decode_cache));
memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
}
static int handle_emulation_failure(struct kvm_vcpu *vcpu)
{
++vcpu->stat.insn_emulation_fail;
@ -3987,20 +4009,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
cache_all_regs(vcpu);
if (!(emulation_type & EMULTYPE_NO_DECODE)) {
int cs_db, cs_l;
kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
vcpu->arch.emulate_ctxt.vcpu = vcpu;
vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);
vcpu->arch.emulate_ctxt.mode =
(!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
(vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
? X86EMUL_MODE_VM86 : cs_l
? X86EMUL_MODE_PROT64 : cs_db
? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
memset(c, 0, sizeof(struct decode_cache));
memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
init_emulate_ctxt(vcpu);
vcpu->arch.emulate_ctxt.interruptibility = 0;
vcpu->arch.emulate_ctxt.exception = -1;
vcpu->arch.emulate_ctxt.perm_ok = false;
@ -5052,22 +5061,9 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
bool has_error_code, u32 error_code)
{
struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
int cs_db, cs_l, ret;
cache_all_regs(vcpu);
int ret;
kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
vcpu->arch.emulate_ctxt.vcpu = vcpu;
vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);
vcpu->arch.emulate_ctxt.mode =
(!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
(vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
? X86EMUL_MODE_VM86 : cs_l
? X86EMUL_MODE_PROT64 : cs_db
? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
memset(c, 0, sizeof(struct decode_cache));
memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
init_emulate_ctxt(vcpu);
ret = emulator_task_switch(&vcpu->arch.emulate_ctxt,
tss_selector, reason, has_error_code,