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From: Oliver Upton To: David Woodhouse Cc: Paolo Bonzini , Jonathan Corbet , Marc Zyngier , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Mark Rutland , Lorenzo Pieralisi , "Rafael J. Wysocki" , Pavel Machek , Len Brown , Shuah Khan , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-pm@vger.kernel.org, linux-kselftest@vger.kernel.org, Francesco Lavra , Miguel Luis Subject: Re: [PATCH v5 4/5] KVM: selftests: Add test for PSCI SYSTEM_OFF2 Message-ID: References: <20240926184546.833516-1-dwmw2@infradead.org> <20240926184546.833516-5-dwmw2@infradead.org> <408b137dbf60ff4d189cbd98b7cf8cd833579f61.camel@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241015_101626_841357_AC384FCB X-CRM114-Status: GOOD ( 42.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Oct 15, 2024 at 09:05:18AM -0700, Oliver Upton wrote: > On Sat, Oct 12, 2024 at 10:28:10AM +0100, David Woodhouse wrote: > > On Tue, 2024-10-01 at 08:33 -0700, Oliver Upton wrote: > > > On Thu, Sep 26, 2024 at 07:37:59PM +0100, David Woodhouse wrote: > > > > +       vm = setup_vm(guest_test_system_off2, &source, &target); > > > > +       vcpu_get_reg(target, KVM_REG_ARM_PSCI_VERSION, &psci_version); > > > > +       TEST_ASSERT(psci_version >= PSCI_VERSION(0, 2), > > > > +                   "Unexpected PSCI version %lu.%lu", > > > > +                   PSCI_VERSION_MAJOR(psci_version), > > > > +                   PSCI_VERSION_MINOR(psci_version)); > > > > + > > > > +       if (psci_version < PSCI_VERSION(1,3)) > > > > +               goto skip; > > > > > > I'm not following this. Is there a particular reason why we'd want to > > > skip for v1.2 and fail the test for anything less than that? > > > > These tests unconditionally set KVM_ARM_VCPU_PSCI_0_2 in setup_vm(). > > Which is probably OK assuming support for that that predates > > KVM_CAP_ARM_SYSTEM_SUSPEND (which is already a TEST_REQUIRE() right at > > the start). > > > > So the world is very broken if KVM actually starts a VM but the version > > isn't at least 0.2, and it seemed like it warranted an actual failure. > > If we're looking at this from a testing lens then KVM coming up with any > PSCI version other than KVM_ARM_PSCI_LATEST (i.e. v1.3) is a bug. So > maybe we can tighten that assertion because... > > > > Just do TEST_REQUIRE(psci_version >= PSCI_VERSION(1, 3)), it makes the > > > requirements obvious in the case someone runs new selftests on an old > > > kernel. > > > > I don't think we want to put that in main() and skip the other checks > > that would run on earlier kernels. > > Running KVM selftests on older kernels in a meaningful way isn't > something we support. At all. An example of this is commit > 8a53e1302133 ("KVM: selftests: Require KVM_CAP_USER_MEMORY2 for > tests that create memslots"), which skips ~everything for kernels older > than 6.8. > > > (Even if we had easy access to > > psci_version without actually running a test and starting a VM). > > > > I could put it into host_test_system_off2() which runs last (and > > comment the invocations in main() to say that they're in increasing > > order of PSCI version) to accommodate such). But then it seems that I'd > > be the target of this comment in ksft_exit_skip()... > > > > /* > > * FIXME: several tests misuse ksft_exit_skip so produce > > * something sensible if some tests have already been run > > * or a plan has been printed. Those tests should use > > * ksft_test_result_skip or ksft_exit_fail_msg instead. > > */ > > > > I suspect the real answer here is that the individual tests here be > > calling ksft_test_result_pass(), and the system_off2 one should call > > ksft_test_result_skip() if it skips? > > modulo a few one-offs, KVM selftests doesn't use the kselftest harness > so it isn't subject to this comment. Since there's no test plan, we can > skip at any time. > > > I'll add an explicit comment about the 0.2 check though, saying that it > > should never happen so we might as well have the ASSERT for it. > > After looking at this again, I think we should do one of the following: > > - TEST_REQUIRE() that the PSCI version is at least v1.3, making the > dependency clear on older kernels. > > - TEST_REQUIRE() for v1.3, which would provide better test coverage on > upstream. Sorry, I meant TEST_ASSERT() here. > -- > Thanks, > Oliver >