linux-kernel - Re: [PATCH v2 11/13] KVM: selftests: Add wrapper macro to handle and assert on expected SIGBUS

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Message-ID: <aOWDM_7gYNwUZFgz@google.com>
Date: Tue, 7 Oct 2025 21:16:35 +0000
From: Lisa Wang <wyihan@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Janosch Frank <frankja@...ux.ibm.com>,
	Claudio Imbrenda <imbrenda@...ux.ibm.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Hildenbrand <david@...hat.com>,
	Fuad Tabba <tabba@...gle.com>,
	Ackerley Tng <ackerleytng@...gle.com>
Subject: Re: [PATCH v2 11/13] KVM: selftests: Add wrapper macro to handle and
 assert on expected SIGBUS

Fri, Oct 03, 2025 at 04:26:04PM -0700, Sean Christopherson wrote:
> Extract the guest_memfd test's SIGBUS handling functionality into a common
> TEST_EXPECT_SIGBUS() macro in anticipation of adding more SIGBUS testcases.
> Eating a SIGBUS isn't terrible difficult, but it requires a non-trivial
> amount of boilerplate code, and using a macro allows selftests to print
> out the exact action that failed to generate a SIGBUS without the developer
> needing to remember to add a useful error message.
> 
> Explicitly mark the SIGBUS handler as "used", as gcc-14 at least likes to
> discard the function before linking.
> 
> Suggested-by: Ackerley Tng <ackerleytng@...gle.com>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>


Reviewed-by: Lisa Wang <wyihan@...gle.com>
Tested-by: Lisa Wang <wyihan@...gle.com>

> ---
>  .../testing/selftests/kvm/guest_memfd_test.c  | 18 +-----------------
>  .../testing/selftests/kvm/include/test_util.h | 19 +++++++++++++++++++
>  tools/testing/selftests/kvm/lib/test_util.c   |  7 +++++++
>  3 files changed, 27 insertions(+), 17 deletions(-)
>
>
> [...snip...] 
> 
>