Eliminate the need to call back into KVM to get it from emulator.
Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_emulate.h | 1 +
arch/x86/kvm/emulate.c | 6 +++---
arch/x86/kvm/x86.c | 1 +
3 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index 0c5caa4..d8b2da0 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -159,6 +159,7 @@ struct x86_emulate_ctxt {
struct kvm_vcpu *vcpu;
unsigned long eflags;
+ int cpl;
/* Emulated execution mode, represented by an X86EMUL_MODE value. */
int mode;
u32 cs_base;
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 3d1ee74..ed29a52 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1254,7 +1254,7 @@ static int emulate_popf(struct x86_emulate_ctxt *ctxt,
int rc;
unsigned long val, change_mask;
int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
- int cpl = kvm_x86_ops->get_cpl(ctxt->vcpu);
+ int cpl = ctxt->cpl;
rc = emulate_pop(ctxt, ops, &val, len);
if (rc != X86EMUL_CONTINUE)
@@ -1763,7 +1763,7 @@ static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt)
if (ctxt->mode == X86EMUL_MODE_VM86)
return true;
iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
- return kvm_x86_ops->get_cpl(ctxt->vcpu) > iopl;
+ return ctxt->cpl > iopl;
}
static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt,
@@ -1839,7 +1839,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
}
/* Privileged instruction can be executed only in CPL=0 */
- if ((c->d & Priv) && kvm_x86_ops->get_cpl(ctxt->vcpu)) {
+ if ((c->d & Priv) && ctxt->cpl) {
kvm_inject_gp(ctxt->vcpu, 0);
goto done;
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8f2b61c..9b5fb43 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3499,6 +3499,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
vcpu->arch.emulate_ctxt.vcpu = vcpu;
vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
+ vcpu->arch.emulate_ctxt.cpl = kvm_x86_ops->get_cpl(vcpu);
vcpu->arch.emulate_ctxt.mode =
(!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
(vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
--
1.6.5
--
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