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KVM: x86: set ctxt->have_exception in x86_decode_insn()

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x86_emulate_instruction() takes into account ctxt->have_exception flag
during instruction decoding, but in practice this flag is never set in
x86_decode_insn().

Fixes: 6ea6e84309 ("KVM: x86: inject exceptions produced by x86_decode_insn")
Cc: [email protected]
Cc: Denis Lunev <[email protected]>
Cc: Roman Kagan <[email protected]>
Cc: Denis Plotnikov <[email protected]>
Signed-off-by: Jan Dakinevich <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Jan Dakinevich
2019-09-11 18:01:34 +02:00
committed by Paolo Bonzini
parent 8530a79c5a
commit c8848cee74
2 changed files with 8 additions and 0 deletions
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arch/x86/kvm/emulate.c
+2
View File
@@ -5416,6 +5416,8 @@ done_prefixes:
ctxt->memopp->addr.mem.ea + ctxt->_eip);
done:
if (rc == X86EMUL_PROPAGATE_FAULT)
ctxt->have_exception = true;
return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK;
}
arch/x86/kvm/x86.c
+6
View File
@@ -6577,6 +6577,12 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu,
emulation_type))
return EMULATE_DONE;
if (ctxt->have_exception) {
/*
* #UD should result in just EMULATION_FAILED, and trap-like
* exception should not be encountered during decode.
*/
WARN_ON_ONCE(ctxt->exception.vector == UD_VECTOR ||
exception_type(ctxt->exception.vector) == EXCPT_TRAP);
inject_emulated_exception(vcpu);
return EMULATE_DONE;
}