Re: [PATCH v2 0/2] KVM: arm64: Fixup PC updates on exit to userspace

Zenghui Yu
2021-05-14T12:32:50Z

Hi Marc,

On 2021/5/14 18:40, Marc Zyngier wrote:
> We recently moved anything related to PC updates into the guest entry
> code to help with the protected KVM effort. However, I missed a
> critical point: userspace needs to be able to observe state changes
> when the vcpu exits. Otherwise, live migration is a bit broken and
> vcpu reset can fail (as reported by Zenghui). Not good.
>
> These two patches aim at fixing the above, and carry a Cc stable.
>
> * From v1:
> - Sanitized flag checking
> - Added comment about relying on __kvm_adjust_pc() being preempt-safe

I had a try but failed to find the added comment ;-). Regardless,

Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Tested-by: Zenghui Yu <yuzenghui@huawei.com>