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
