Re: [PATCH v3 2/2] KVM: selftests: Test that KVM_RUN fails for unresolvable host faults

[Christian Borntraeger <borntraeger@linux.ibm.com>]

Am 05.11.26 um 02:02 schrieb Sean Christopherson:
> On Tue, Oct 27, 2026, Christian Borntraeger wrote:
>> Am 23.10.26 um 17:06 schrieb Sean Christopherson:
>>> On Fri, Oct 23, 2026, Christian Borntraeger wrote:
>>>> Add a test in which the guest writes to a shmem-backed memslot beyond
>>>> the end of the file.  KVM_RUN must fail with -EFAULT.
>>>>
>>>> On x86 the guest enables interrupts, and on s390 the test sets up
>>>> pfault, so that KVM could handle the fault with an asynchronous page
>>>> fault.  If KVM mistakes the error for a fault that needs I/O, the vCPU
>>>> retries the access forever, and the test fails after a timeout.
>>>>
>>>> The test is not built for LoongArch, which handles a failed mapping as
>>>> an MMIO access.
>>>>
>>>> Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
>>>> ---
>>>> I went with Seans name proposal
>>>
>>> Aww, bummer.  If you posted a faulty_mcfault_face_test, I would absolutely apply
>>> that and force Paolo to tell me no :-)
>>
>> Sean,
>> Will you pick up the fix and the selftest, shall I do it or Paolo directly?
> 
> I can grab 'em.  Were you hoping to get the fix into 7.4?  It doesn't seem super
> urgent?  I was leaning towards waiting for 7.5, but tagging it for stable@.  I.e.
> give ourselves a full cycle to make sure we didn't miss something, then get the
> fix backported because I wouldn't be surprised if people are hitting this in
> production without realizing it.

No, not super urgent. Might not even qualify for stable.