linux-kernel - Re: [PATCH v2 12/13] KVM: selftests: Verify that faulting in private guest

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Message-ID: <diqz347vga3s.fsf@google.com>
Date: Mon, 06 Oct 2025 11:26:31 -0700
From: Ackerley Tng <ackerleytng@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Christian Borntraeger <borntraeger@...ux.ibm.com>, Janosch Frank <frankja@...ux.ibm.com>, 
	Claudio Imbrenda <imbrenda@...ux.ibm.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	David Hildenbrand <david@...hat.com>, Fuad Tabba <tabba@...gle.com>
Subject: Re: [PATCH v2 12/13] KVM: selftests: Verify that faulting in private
 guest_memfd memory fails

Sean Christopherson <seanjc@...gle.com> writes:

> Add a guest_memfd testcase to verify that faulting in private memory gets
> a SIGBUS.  For now, test only the case where memory is private by default
> since KVM doesn't yet support in-place conversion.
>
> Deliberately run the CoW test with and without INIT_SHARED set as KVM
> should disallow MAP_PRIVATE regardless of whether the memory itself is
> private from a CoCo perspective.
>
> Cc: Ackerley Tng <ackerleytng@...gle.com>

Thanks Sean!

Tested-by: Ackerley Tng <ackerleytng@...gle.com>

> Reviewed-by: Fuad Tabba <tabba@...gle.com>
> Tested-by: Fuad Tabba <tabba@...gle.com>
> Reviewed-by: David Hildenbrand <david@...hat.com>
> Reviewed-by: Ackerley Tng <ackerleytng@...gle.com>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  .../testing/selftests/kvm/guest_memfd_test.c  | 26 +++++++++++++++----
>  1 file changed, 21 insertions(+), 5 deletions(-)
>
> 
> [...snip...]
>