KVM: SVM: copy instruction bytes from VMCB
In case of a nested page fault or an intercepted #PF newer SVM
implementations provide a copy of the faulting instruction bytes
in the VMCB.
Use these bytes to feed the instruction emulator and avoid the costly
guest instruction fetch in this case.
Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a6fcb76..7ad9cda 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4365,7 +4365,9 @@
int x86_emulate_instruction(struct kvm_vcpu *vcpu,
unsigned long cr2,
- int emulation_type)
+ int emulation_type,
+ void *insn,
+ int insn_len)
{
int r;
struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
@@ -4386,7 +4388,7 @@
vcpu->arch.emulate_ctxt.have_exception = false;
vcpu->arch.emulate_ctxt.perm_ok = false;
- r = x86_decode_insn(&vcpu->arch.emulate_ctxt);
+ r = x86_decode_insn(&vcpu->arch.emulate_ctxt, insn, insn_len);
if (r == X86EMUL_PROPAGATE_FAULT)
goto done;