On 07/03/17 17:45 +0200, Paolo Bonzini wrote: > > > On 03/07/2017 17:23, Haozhong Zhang wrote: > > Otherwise, QEMU on a host with MPX support will try to set guest > > MSR_IA32_BNDCFGS although guest MPX is not enabled, and result in > > abort. > > > > For example, > > qemu-system-x86_64 -enable-kvm -cpu qemu64,-mpx ... > > aborts with messages: > > qemu-system-x86_64: error: failed to set MSR 0xd90 to 0x0 > > qemu-system-x86_64: /root/qemu.git/target/i386/kvm.c:1832: kvm_put_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed > > I think the fix should be in KVM, allowing BNDCFGS = 0 if > host_initiated, even if MPX is not enabled. > Agree. I've sent a KVM patch to fix this issue. Thanks, Haozhong
