KVM currently ignores fetch faults in the instruction emulator. With nested-npt we could have such faults. This patch adds the code to handle these. Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx> --- arch/x86/kvm/emulate.c | 3 +++ arch/x86/kvm/x86.c | 4 ++++ 2 files changed, 7 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 2b08b78..aead72e 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1198,6 +1198,9 @@ static int emulate_popf(struct x86_emulate_ctxt *ctxt, *(unsigned long *)dest = (ctxt->eflags & ~change_mask) | (val & change_mask); + if (rc == X86EMUL_PROPAGATE_FAULT) + emulate_pf(ctxt); + return rc; } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 2816e5a..16c044b 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4233,6 +4233,9 @@ int emulate_instruction(struct kvm_vcpu *vcpu, vcpu->arch.emulate_ctxt.perm_ok = false; r = x86_decode_insn(&vcpu->arch.emulate_ctxt); + if (r == X86EMUL_PROPAGATE_FAULT) + goto done; + trace_kvm_emulate_insn_start(vcpu); /* Only allow emulation of specific instructions on #UD @@ -4291,6 +4294,7 @@ restart: return handle_emulation_failure(vcpu); } +done: if (vcpu->arch.emulate_ctxt.exception >= 0) { inject_emulated_exception(vcpu); r = EMULATE_DONE; -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html