Re: [PATCH v2 10/11] KVM: selftests: nSVM: Add svm_nested_soft_inject_test

[Maciej S. Szmigiero]

On 23.04.2022 04:14, Sean Christopherson wrote:
> From: Maciej S. Szmigiero <maciej.szmigiero@xxxxxxxxxx>
>
> Add a KVM self-test that checks whether a nSVM L1 is able to successfully
> inject a software interrupt and a soft exception into its L2 guest.
>
> In practice, this tests both the next_rip field consistency and
> L1-injected event with intervening L0 VMEXIT during its delivery:
> the first nested VMRUN (that's also trying to inject a software interrupt)
> will immediately trigger a L0 NPF.
> This L0 NPF will have zero in its CPU-returned next_rip field, which if
> incorrectly reused by KVM will trigger a #PF when trying to return to
> such address 0 from the interrupt handler.
>
> Reviewed-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
> Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@xxxxxxxxxx>
> [sean: check exact L2 RIP on first soft interrupt]
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>

Looks like this version doesn't integrate the changes that Maxim has suggested [1].
Will provide an updated version after I test the patch set.

Thanks,
Maciej

[1]: https://lore.kernel.org/kvm/2401bf729beab6d9348fda18f55e90ed9c1f7583.camel@xxxxxxxxxx/