Hi Paolo [sorry to resend it, seems to reply it incorrectly] On Wed, 4 Dec 2019 at 19:23, Paolo Bonzini <pbonz...@redhat.com> wrote:
> On 04/12/19 09:50, Catherine Ho wrote: > > Commit 20a78b02d315 ("target/i386: add VMX features") unconditionally > > add vmx msr entry although older host kernels don't include them. > > > > But old host kernel + newest qemu will cause a qemu crash as follows: > > qemu-system-x86_64: error: failed to set MSR 0x480 to 0x0 > > target/i386/kvm.c:2932: kvm_put_msrs: Assertion `ret == > > cpu->kvm_msr_buf->nmsrs' failed. > > > > This fixes it by relaxing the condition. > > This is intentional. The VMX MSR entries should not have been added. > What combination of host kernel/QEMU are you using, and what QEMU > command line? > > > Host kernel: 4.15.0 (ubuntu 18.04) Qemu: https://gitlab.com/virtio-fs/qemu/tree/virtio-fs-dev cmdline: qemu-system-x86_64 -M pc -cpu host --enable-kvm -smp 8 \ -m 4G,maxmem=4G But before 20a78b02d315, the older kernel + latest qemu can boot guest successfully. Best Regards, Catherine