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KVM: x86 emulator: Don't overwrite decode cache 

Currently if we an instruction spans a page boundary, when we fetch the
second half we overwrite the first half.  This prevents us from tracing
the full instruction opcodes.

Fix by appending the second half to the first.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2010-04-11 13:05:15 +03:00
parent 4496f97482
commit 2fb53ad811
1 changed files with 10 additions and 9 deletions
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19
arch/x86/kvm/emulate.c
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@ -646,21 +646,22 @@ static unsigned long ss_base(struct x86_emulate_ctxt *ctxt)
static int do_fetch_insn_byte(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops,
unsigned long linear, u8 *dest)
unsigned long eip, u8 *dest)
{
struct fetch_cache *fc = &ctxt->decode.fetch;
int rc;
int size;
int size, cur_size;
if (linear < fc->start || linear >= fc->end) {
size = min(15UL, PAGE_SIZE - offset_in_page(linear));
rc = ops->fetch(linear, fc->data, size, ctxt->vcpu, NULL);
if (eip == fc->end) {
cur_size = fc->end - fc->start;
size = min(15UL - cur_size, PAGE_SIZE - offset_in_page(eip));
rc = ops->fetch(ctxt->cs_base + eip, fc->data + cur_size,
size, ctxt->vcpu, NULL);
if (rc != X86EMUL_CONTINUE)
return rc;
fc->start = linear;
fc->end = linear + size;
fc->end += size;
}
*dest = fc->data[linear - fc->start];
*dest = fc->data[eip - fc->start];
return X86EMUL_CONTINUE;
}
@ -673,7 +674,6 @@ static int do_insn_fetch(struct x86_emulate_ctxt *ctxt,
/* x86 instructions are limited to 15 bytes. */
if (eip + size - ctxt->eip > 15)
return X86EMUL_UNHANDLEABLE;
eip += ctxt->cs_base;
while (size--) {
rc = do_fetch_insn_byte(ctxt, ops, eip++, dest++);
if (rc != X86EMUL_CONTINUE)
@ -935,6 +935,7 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
/* Shadow copy of register state. Committed on successful emulation. */
memset(c, 0, sizeof(struct decode_cache));
c->eip = ctxt->eip;
c->fetch.start = c->fetch.end = c->eip;
ctxt->cs_base = seg_base(ctxt, VCPU_SREG_CS);
memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs);