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KVM: SVM: copy instruction bytes from VMCB

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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>
This commit is contained in:
Andre Przywara
2010-12-21 11:12:07 +01:00
committed by Avi Kivity
parent df4f310856
commit dc25e89e07
8 changed files with 26 additions and 15 deletions
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7
arch/x86/kvm/emulate.c
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@ -2610,7 +2610,7 @@ done:
}
int
x86_decode_insn(struct x86_emulate_ctxt *ctxt)
x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
{
struct x86_emulate_ops *ops = ctxt->ops;
struct decode_cache *c = &ctxt->decode;
@ -2621,7 +2621,10 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt)
struct operand memop = { .type = OP_NONE };
c->eip = ctxt->eip;
c->fetch.start = c->fetch.end = c->eip;
c->fetch.start = c->eip;
c->fetch.end = c->fetch.start + insn_len;
if (insn_len > 0)
memcpy(c->fetch.data, insn, insn_len);
ctxt->cs_base = seg_base(ctxt, ops, VCPU_SREG_CS);
switch (mode) {