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[195.150.55.226]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-67ef0e0d4bdsm3938024a12.23.2026.05.11.08.09.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2026 08:09:25 -0700 (PDT) Date: Mon, 11 May 2026 17:09:25 +0200 From: Piotr Zarycki To: Sean Christopherson Cc: pbonzini@redhat.com, shuah@kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] KVM: selftests: sync_regs_test: use KVM_SYNC_X86_VALID_FIELDS Message-ID: References: <20260511143426.1242013-1-piotr.zarycki@gmail.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Mon, May 11, 2026 at 07:56:50AM -0700, Sean Christopherson wrote: > On Mon, May 11, 2026, Piotr Zarycki wrote: > > Use KVM_SYNC_X86_VALID_FIELDS instead of open-coding the same three > > flags, ensuring the test stays in sync with any future additions. > > > > Signed-off-by: Piotr Zarycki > > --- > > tools/testing/selftests/kvm/x86/sync_regs_test.c | 3 +-- > > 1 file changed, 1 insertion(+), 2 deletions(-) > > > > diff --git a/tools/testing/selftests/kvm/x86/sync_regs_test.c b/tools/testing/selftests/kvm/x86/sync_regs_test.c > > index e0c52321f87c..8f9239f9d357 100644 > > --- a/tools/testing/selftests/kvm/x86/sync_regs_test.c > > +++ b/tools/testing/selftests/kvm/x86/sync_regs_test.c > > @@ -79,7 +79,7 @@ static void compare_vcpu_events(struct kvm_vcpu_events *left, > > { > > } > > > > -#define TEST_SYNC_FIELDS (KVM_SYNC_X86_REGS|KVM_SYNC_X86_SREGS|KVM_SYNC_X86_EVENTS) > > +#define TEST_SYNC_FIELDS KVM_SYNC_X86_VALID_FIELDS > > Explicitly defining the set of fields to test is very deliberate. (a) we want > to detect ABI breakage, e.g. if KVM removes a valid field. (b) if a field is > added in the future, the test likely needs to be updated, i.e. would break if > KVM extends KVM_SYNC_X86_VALID_FIELDS. (c) KVM_SYNC_X86_VALID_FIELDS probably > shouldn't be defined in a uapi header; for all intents and purposes it's a KVM- > internal details. > > > #define INVALID_SYNC_FIELD 0x80000000 > > > > /* > > @@ -255,7 +255,6 @@ KVM_ONE_VCPU_TEST(sync_regs_test, req_and_verify_all_valid, guest_code) > > struct kvm_regs regs; > > > > /* Request and verify all valid register sets. */ > > - /* TODO: BUILD TIME CHECK: TEST_ASSERT(KVM_SYNC_X86_NUM_FIELDS != 3); */ > > run->kvm_valid_regs = TEST_SYNC_FIELDS; > > vcpu_run(vcpu); > > TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO); > > -- > > 2.54.0 > > Thanks for the explanation. What's the preferred way to implement the build-time check mentioned in the TODO?