Paolo Bonzini <pbonzini@xxxxxxxxxx> writes:
> KVM: nVMX: Don't emulate instructions in guest mode
I just discovered that this patch breaks Hyper-V on KVM completely;
Oliver's 86f7e90ce8 ("KVM: VMX: check descriptor table exits on
instruction emulation") doesn't fix it either. The breakage manifests
itself as
qemu-system-x86-23579 [005] 22018.775584: kvm_exit: reason EPT_VIOLATION rip 0xfffff802987d6169 info 181 0
qemu-system-x86-23579 [005] 22018.775584: kvm_nested_vmexit: rip fffff802987d6169 reason EPT_VIOLATION info1 181 info2 0 int_info 0 int_info_err 0
qemu-system-x86-23579 [005] 22018.775585: kvm_page_fault: address febd0000 error_code 181
qemu-system-x86-23579 [005] 22018.775592: kvm_emulate_insn: 0:fffff802987d6169: f3 a5
qemu-system-x86-23579 [005] 22018.775593: kvm_emulate_insn: 0:fffff802987d6169: f3 a5 FAIL
qemu-system-x86-23579 [005] 22018.775596: kvm_inj_exception: #UD (0x0)
We probably need to re-enable instruction emulation for something...
--
Vitaly
