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Mon, 02 Jun 2025 16:38:41 +0100 Date: Mon, 02 Jun 2025 16:38:38 +0100 Message-ID: <87msaqdugx.wl-maz@kernel.org> From: Marc Zyngier To: Itaru Kitayama Cc: Ganapatrao Kulkarni , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, seanjc@google.com, darren@os.amperecomputing.com Subject: Re: [RFC PATCH v2 8/9] KVM: selftests: arm64: Extend kvm_page_table_test to run guest code in vEL2 In-Reply-To: References: <20250512105251.577874-1-gankulkarni@os.amperecomputing.com> <20250512105251.577874-9-gankulkarni@os.amperecomputing.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 149.88.19.236 X-SA-Exim-Rcpt-To: itaru.kitayama@linux.dev, gankulkarni@os.amperecomputing.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, seanjc@google.com, darren@os.amperecomputing.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250602_083845_120978_791BCCD5 X-CRM114-Status: GOOD ( 17.24 ) 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 Mon, 02 Jun 2025 07:04:07 +0100, Itaru Kitayama wrote: > > On Mon, May 12, 2025 at 03:52:50AM -0700, Ganapatrao Kulkarni wrote: > > Adding code to run guest_code in vEL2. > > NV is enabled using command line argument and it is disabled by default. > > > > NV is only enabled on ARM64, for other architectures the test will exit > > with an ASSERT, if tried to run with NV enabled. > > > > I'm seeing this in QEMU TCG mode, does this mean the limitation of the > emulation? > > $ sudo /mnt/projects/linux/tools/testing/selftests/kvm/arm64/page_fault_test -m 3 -s anonymous > Random seed: 0x6b8b4567 > ==== Test Assertion Failure ==== > arm64/page_fault_test.c:632: test->expected_events.uffd_faults == events.uffd_faults > pid=769 tid=769 errno=9 - Bad file descriptor > 1 0x000000000040325b: check_event_counts at page_fault_test.c:632 > 2 (inlined by) run_test at page_fault_test.c:739 > 3 0x0000000000403cbf: for_each_guest_mode at guest_modes.c:96 > 4 0x0000000000401cfb: for_each_test_and_guest_mode at page_fault_test.c:1107 > 5 (inlined by) main at page_fault_test.c:1133 > 6 0x0000ffff848122db: ?? ??:0 > 7 0x0000ffff848123bb: ?? ??:0 > 8 0x0000000000401def: _start at ??:? > 0x2 != 0x1 (test->expected_events.uffd_faults != events.uffd_faults) Unlikely. This could be a bug in the test, in KVM, or most likely both. You will have to investigate, I'm afraid. M. -- Jazz isn't dead. It just smells funny.