KVM: x86: Do not update EFLAGS on faulting emulation
If the emulation ends in fault, eflags should not be updated. However, several instruction emulations (actually all the fastops) currently update eflags, if the fault was detected afterwards (e.g., #PF during writeback). Signed-off-by: Nadav Amit <namit@cs.technion.ac.il> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -5360,7 +5360,9 @@ restart:
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kvm_rip_write(vcpu, ctxt->eip);
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if (r == EMULATE_DONE)
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kvm_vcpu_check_singlestep(vcpu, rflags, &r);
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__kvm_set_rflags(vcpu, ctxt->eflags);
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if (!ctxt->have_exception ||
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exception_type(ctxt->exception.vector) == EXCPT_TRAP)
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__kvm_set_rflags(vcpu, ctxt->eflags);
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/*
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* For STI, interrupts are shadowed; so KVM_REQ_EVENT will
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