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AJvYcCXptqmO8SZ4yovULyGNMPECVrNle2mztF8x5SB3MNOOhpLSVQxjX8dmrSS6fGMEz4w+nGLq88AQcfk=@vger.kernel.org X-Gm-Message-State: AOJu0Yxsj+Pfs8FFgScIlCt4vv6o6tybY2DwbmpCax9kciti644ZjaHX w7zsqrPzrZpy+YOh8kd+dpH2ZQ2uNl1TLxQ/9IaA+rbz33+9dGYvA8UFCmndI1hopG0KQLTCqz+ aMRXxYYVmw4rmGu5Gsf7TpPK+ERF3Fr9Jm8tx+GIb X-Gm-Gg: AY/fxX7DtFEGbQaz+p8DXTnUYeYML0va+dHlwXgYdEhqoPfqCGwn9tyDij2QvhZdCDz OH42a5ZoIZrdmXf6jZlSvs1p7XrfRhXyt1GXM9D0d+vDPRzDkEX5EctxPK0wBYZfEe1gNPXuPG5 7UWmK3tC0bGXCDt41t9szpi3gIMo4DiKogAe0gSxHG+0X2C/BZB7FPxgV91rfwQnhDYn0dfLM/R /cXwsd5TEtYL1eb155T8HSMBAe7nJci7XrA6xCr4mcNg8TRq+IptBV1S6gFWZ5DLYcTOHUz4nKG zYsbBJSpX0YcpbR9eGON5ooUj0Jt X-Google-Smtp-Source: AGHT+IGycUDLgfiYo6g1zTqU/jgYJfkyvEbX43ygSbXNWZeJGMb236iTpZ88xPMSD0uFM0/wQUo7NV0Ahf4F4PzTuS8= X-Received: by 2002:a05:600c:83c4:b0:477:86fd:fb18 with SMTP id 5b1f17b1804b1-47a94869ebbmr337505e9.8.1765579369059; Fri, 12 Dec 2025 14:42:49 -0800 (PST) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20251013185903.1372553-1-jiaqiyan@google.com> <20251013185903.1372553-3-jiaqiyan@google.com> <3061f5f8-cef0-b7b1-c4de-f2ceea29af9a@huawei.com> In-Reply-To: From: Jiaqi Yan Date: Fri, 12 Dec 2025 14:42:37 -0800 X-Gm-Features: AQt7F2rl2f5bneq6f6crNhZuIfA-M_NY1_crL-5oW0NtvHoqkZtXMaIozb_07o8 Message-ID: Subject: Re: [PATCH v4 2/3] KVM: selftests: Test for KVM_EXIT_ARM_SEA To: Zenghui Yu Cc: maz@kernel.org, oliver.upton@linux.dev, duenwen@google.com, rananta@google.com, jthoughton@google.com, vsethi@nvidia.com, jgg@nvidia.com, joey.gouly@arm.com, suzuki.poulose@arm.com, catalin.marinas@arm.com, will@kernel.org, pbonzini@redhat.com, corbet@lwn.net, shuah@kernel.org, kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Dec 12, 2025 at 1:22=E2=80=AFAM Zenghui Yu w= rote: > > On 2025/12/12 9:53, Jiaqi Yan wrote: > > On Thu, Dec 11, 2025 at 5:02=E2=80=AFAM Zenghui Yu wrote: > > > > > > I can also hit this ASSERT with: > > > > > > Random seed: 0x6b8b4567 > > > # Mapped 0x40000 pages: gva=3D0x80000000 to gpa=3D0xff80000000 > > > # Before EINJect: data=3D0xbaadcafe > > > # EINJ_GVA=3D0x81234bad, einj_gpa=3D0xff81234bad, einj_hva=3D0xffff41= 234bad, > > > einj_hpa=3D0x2841234bad > > > # echo 0x10 > /sys/kernel/debug/apei/einj/error_type - done > > > # echo 0x2 > /sys/kernel/debug/apei/einj/flags - done > > > # echo 0x2841234bad > /sys/kernel/debug/apei/einj/param1 - done > > > # echo 0xffffffffffffffff > /sys/kernel/debug/apei/einj/param2 - done > > > # echo 0x1 > /sys/kernel/debug/apei/einj/notrigger - done > > > # echo 0x1 > /sys/kernel/debug/apei/einj/error_inject - done > > > # Memory UER EINJected > > > # Dump kvm_run info about KVM_EXIT_MMIO > > > # kvm_run.arm_sea: esr=3D0xffff90ba0040, flags=3D0x691000 > > > # kvm_run.arm_sea: gva=3D0x100000008, gpa=3D0 > > > =3D=3D=3D=3D Test Assertion Failure =3D=3D=3D=3D > > > arm64/sea_to_user.c:207: exit_reason =3D=3D (41) > > > pid=3D38023 tid=3D38023 errno=3D4 - Interrupted system call > > > 1 0x0000000000402d1b: run_vm at sea_to_user.c:207 > > > 2 0x0000000000402467: main at sea_to_user.c:330 > > > 3 0x0000ffff9122b03f: ?? ??:0 > > > 4 0x0000ffff9122b117: ?? ??:0 > > > 5 0x00000000004026ef: _start at ??:? > > > Wanted KVM exit reason: 41 (ARM_SEA), got: 6 (MMIO) > > > > > > Not sure what's wrong it.. > > > > Does your test machine have SDEI or SCI enabled for host APEI? Do you > > see any kernel log from "Memory failure:" saying hugetlb page > > recovered, and recovered significant earlier than the KVM exit here. > > It maybe the kernel has already unmapped hugepage in response to SDEI > > or SCI before this test actually consumes memory error, so no SEA is > > actually triggered. > > No kernel log was printed when I saw this failure. Hmm, and even no CPER logged by APEI/GHES? That makes me suspect the error wasn't injected successfully. In that case, I found a bug in sea_to_user.c: GUEST_FAIL is not handled by run_vm and results in unhandled MMIO. Here is a fix I tested on my side, with some other minor fixes. Do you mind trying it? commit b96a92d1006fbe2752ba133eb76b0c45c9c54265 Author: Jiaqi Yan Date: Fri Dec 12 22:27:53 2025 +0000 KVM: selftests: Improve sea_to_user test Several improvments to the test for KVM_EXIT_ARM_SEA: - refactor run_vm to catch GUEST_FAIL, instead of causing confusing kvm exit with unhandled MMIO - sync far_invalid to guest - exit with KSFT_SKIP or KSFT_FAIL when should Change-Id: I8b735de3b669297f0638bea2d32a0b36211f7f5c diff --git a/tools/testing/selftests/kvm/arm64/sea_to_user.c b/tools/testing/selftests/kvm/arm64/sea_to_user.c index 573dd790aeb8e..6fd3cd881b415 100644 --- a/tools/testing/selftests/kvm/arm64/sea_to_user.c +++ b/tools/testing/selftests/kvm/arm64/sea_to_user.c @@ -98,11 +98,15 @@ static void write_einj_entry(const char *einj_path, uint64_t val) static void inject_uer(uint64_t paddr) { - if (access("/sys/firmware/acpi/tables/EINJ", R_OK) =3D=3D -1) - ksft_test_result_skip("EINJ table no available in firmware"= ); + if (access("/sys/firmware/acpi/tables/EINJ", R_OK) =3D=3D -1) { + ksft_test_result_skip("EINJ table not available in firmware= \n"); + exit(KSFT_SKIP); + } - if (access(EINJ_ETYPE, R_OK | W_OK) =3D=3D -1) + if (access(EINJ_ETYPE, R_OK | W_OK) =3D=3D -1) { ksft_test_result_skip("EINJ module probably not loaded?\n")= ; + exit(KSFT_SKIP); + } write_einj_entry(EINJ_ETYPE, ERROR_TYPE_MEMORY_UER); write_einj_entry(EINJ_FLAGS, MASK_MEMORY_UER); @@ -123,12 +127,13 @@ static void sigbus_signal_handler(int sig, siginfo_t *si, void *v) ksft_print_msg("SIGBUS (%d) received, dumping siginfo...\n", sig); ksft_print_msg("si_signo=3D%d, si_errno=3D%d, si_code=3D%d, si_addr= =3D%p\n", si->si_signo, si->si_errno, si->si_code, si->si_addr= ); - if (si->si_code =3D=3D BUS_MCEERR_AR) + if (si->si_code =3D=3D BUS_MCEERR_AR) { ksft_test_result_skip("SEA is claimed by host APEI\n"); - else + exit(KSFT_SKIP); + } else { ksft_test_result_fail("Exit with signal unhandled\n"); - - exit(0); + exit(KSFT_FAIL); + } } static void setup_sigbus_handler(void) @@ -158,7 +163,6 @@ static void expect_sea_handler(struct ex_regs *regs) { u64 esr =3D read_sysreg(esr_el1); u64 far =3D read_sysreg(far_el1); - bool expect_far_invalid =3D far_invalid; GUEST_PRINTF("Handling Guest SEA\n"); GUEST_PRINTF("ESR_EL1=3D%#lx, FAR_EL1=3D%#lx\n", esr, far); @@ -166,7 +170,7 @@ static void expect_sea_handler(struct ex_regs *regs) GUEST_ASSERT_EQ(ESR_ELx_EC(esr), ESR_ELx_EC_DABT_CUR); GUEST_ASSERT_EQ(esr & ESR_ELx_FSC_TYPE, ESR_ELx_FSC_EXTABT); - if (expect_far_invalid) { + if (far_invalid) { GUEST_ASSERT_EQ(esr & ESR_ELx_FnV, ESR_ELx_FnV); GUEST_PRINTF("Guest observed garbage value in FAR\n"); } else { @@ -185,25 +189,19 @@ static void vcpu_inject_sea(struct kvm_vcpu *vcpu) vcpu_events_set(vcpu, &events); } -static void run_vm(struct kvm_vm *vm, struct kvm_vcpu *vcpu) +static void validate_kvm_exit_arm_sea(struct kvm_vm *vm, struct kvm_vcpu *= vcpu) { - struct ucall uc; - bool guest_done =3D false; struct kvm_run *run =3D vcpu->run; u64 esr; - /* Resume the vCPU after error injection to consume the error. */ - vcpu_run(vcpu); + TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_ARM_SEA); - ksft_print_msg("Dump kvm_run info about KVM_EXIT_%s\n", - exit_reason_str(run->exit_reason)); + ksft_print_msg("Dumping kvm_run as arm_sea:\n"); ksft_print_msg("kvm_run.arm_sea: esr=3D%#llx, flags=3D%#llx\n", run->arm_sea.esr, run->arm_sea.flags); ksft_print_msg("kvm_run.arm_sea: gva=3D%#llx, gpa=3D%#llx\n", run->arm_sea.gva, run->arm_sea.gpa); - TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_ARM_SEA); - esr =3D run->arm_sea.esr; TEST_ASSERT_EQ(ESR_ELx_EC(esr), ESR_ELx_EC_DABT_LOW); TEST_ASSERT_EQ(esr & ESR_ELx_FSC_TYPE, ESR_ELx_FSC_EXTABT); @@ -211,39 +209,48 @@ static void run_vm(struct kvm_vm *vm, struct kvm_vcpu *vcpu) TEST_ASSERT_EQ((esr & ESR_ELx_INST_SYNDROME), 0); TEST_ASSERT_EQ(esr & ESR_ELx_VNCR, 0); - if (!(esr & ESR_ELx_FnV)) { - ksft_print_msg("Expect gva to match given FnV bit is 0\n"); + far_invalid =3D esr & ESR_ELx_FnV; + sync_global_to_guest(vm, far_invalid); + + if (!far_invalid) { + ksft_print_msg("Expect gva to match\n"); TEST_ASSERT_EQ(run->arm_sea.gva, EINJ_GVA); } if (run->arm_sea.flags & KVM_EXIT_ARM_SEA_FLAG_GPA_VALID) { - ksft_print_msg("Expect gpa to match given KVM_EXIT_ARM_SEA_FLAG_GPA_VALID is set\n"); + ksft_print_msg("Expect gpa to match\n"); TEST_ASSERT_EQ(run->arm_sea.gpa, einj_gpa & PAGE_ADDR_MASK)= ; } +} - far_invalid =3D esr & ESR_ELx_FnV; - - /* Inject a SEA into guest and expect handled in SEA handler. */ - vcpu_inject_sea(vcpu); +static void run_vm(struct kvm_vm *vm, struct kvm_vcpu *vcpu) +{ + struct ucall uc; + bool guest_done =3D false; /* Expect the guest to reach GUEST_DONE gracefully. */ do { vcpu_run(vcpu); - switch (get_ucall(vcpu, &uc)) { - case UCALL_PRINTF: - ksft_print_msg("From guest: %s", uc.buffer); - break; - case UCALL_DONE: - ksft_print_msg("Guest done gracefully!\n"); - guest_done =3D 1; - break; - case UCALL_ABORT: - ksft_print_msg("Guest aborted!\n"); - guest_done =3D 1; - REPORT_GUEST_ASSERT(uc); - break; - default: - TEST_FAIL("Unexpected ucall: %lu\n", uc.cmd); + if (vcpu->run->exit_reason =3D=3D KVM_EXIT_ARM_SEA) { + validate_kvm_exit_arm_sea(vm, vcpu); + vcpu_inject_sea(vcpu); + } else { + switch (get_ucall(vcpu, &uc)) { + case UCALL_PRINTF: + ksft_print_msg("From guest: %s", uc.buffer)= ; + break; + case UCALL_DONE: + ksft_print_msg("Guest done gracefully!\n"); + guest_done =3D 1; + break; + case UCALL_ABORT: + ksft_print_msg("Guest aborted!\n"); + guest_done =3D 1; + REPORT_GUEST_ASSERT(uc); + break; + default: + TEST_FAIL("Unexpected ucall: %lu\n", uc.cmd= ); + } } } while (!guest_done); } > > Thanks, > Zenghui