Re: kvm_buf_set_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.

[Li Feng]

Paolo Bonzini <address@hidden> 于2020年5月20日周三 下午3:28写道：
>
> On 20/05/20 05:50, Li Feng wrote:
> >>>>>>>>> qemu-system-x86_64: error: failed to set MSR 0x48f to 
> >>>>>>>>> 0x7fefff00036dfb
>
> The high 32 bits are 0111 1111 1110 1111 1111 1111.
>
> The low 32 bits are  0000 0011 0110 1101 1111 1011.
>
> The features that are set are the xor, so 0111 1100 1000 0010 0000 0100:
>
> - bit 2, vmx-exit-nosave-debugctl
> - bit 9, host address space size, is handled automatically by QEMU
> - bit 15, vmx-exit-ack-intr
> - bit 17, vmx-exit-save-pat
> - bit 18, vmx-exit-load-pat
> - bit 19, vmx-exit-save-efer
> - bit 20, vmx-exit-load-efer
> - bit 21, vmx-exit-save-preemption-timer
>
> Try removing all of these and see if QEMU starts:
>
> qemu-kvm ... -cpu
> host,-vmx-exit-nosave-debugctl,-vmx-exit-ack-intr,-vmx-exit-save-pat,-vmx-exit-load-pat,-vmx-exit-save-efer,-vmx-exit-load-efer,-vmx-exit-save-preemption-timer
>
> And then add them back one at a time.

Hi, Paolo.
Thanks, the crash is still here when removing the above features:
qemu-system-x86_64: error: failed to set MSR 0x48f to 0x36fff00036dff

After computing xor, the result is 0b1000000000.
The bit 9 is set.

>
> Paolo
>