From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 41A4A33B6EA; Thu, 20 Nov 2025 13:32:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763645541; cv=none; b=Xfne7hAOoCAVNafxvfqpv6By8+IxgeYSOqLYqJeckVtwfZyZGmi3lPplK7hN2yIt9Buin1oxvSr3lIketpGgYKjldc/T4SqzGchvp02wfNPSmV+yihIYu3KYu9o+/MSMEoeBCWevi80E4hDRHBn0K+6OoUuX0QtZAFDfy7v+VtU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763645541; c=relaxed/simple; bh=0HAJBmXE+rJLYXs5hMQhZFeGzkrf7YieZyrcWFUBa8g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OPhcNdgH4E6qUH69sQInhwD7jRv2Y/N4wf0jjqZfklliT5eRmT5npK5Lxyt4gJDZ3SsBJtOL4+U3DG1/Y13Z2oHRnlVfjjvfNl1gEiKlL+xe8v6APj9w57lj7doIAU3KwmZ+d+NCfhUzguQdSiN1/O1YAmavMsU1a+1RX3awb0U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JF7T2KNi; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JF7T2KNi" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6FD0C113D0; Thu, 20 Nov 2025 13:32:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763645540; bh=0HAJBmXE+rJLYXs5hMQhZFeGzkrf7YieZyrcWFUBa8g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JF7T2KNi64/aHzrz4AdAnXLNaGkxBY5A6u7uI0j8+EDlXqnlP9zZakx48hRSgwA8c dn6ovejSmz6+9v4AcbsRbcBCfuqisTyVvthv9DFzmnImAVhebcG0zCamuphkBH3ttv ITq4uVP+VAy1XVmGq0b/0s4LSTHjokXGB4VOx2SlabiBw1bF6xkjpZWowexGY2MmYI ziy+Y7k3+bQH6SwQod3qUg2OxoV5QN/IiSeBXYDbYNLpYio9p5RSIDXN4Njl7Bc0EZ ymUa3q2a785WfBQJDmNiudoi00sxIOfxfaJb1Glx+ONgwQhcjw2iP4nfA5In9+ZNOO P53y3S5m0vmtQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1vM4lm-00000006tUG-3Rl0; Thu, 20 Nov 2025 13:32:18 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: [PATCH 5/5] KVM: arm64: selftests: Add a test for FEAT_IDST Date: Thu, 20 Nov 2025 13:32:02 +0000 Message-ID: <20251120133202.2037803-6-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251120133202.2037803-1-maz@kernel.org> References: <20251120133202.2037803-1-maz@kernel.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, yuzenghui@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Add a very basic test checking that FEAT_IDST actually works for the {GMID,SMIDR,CSSIDR2}_EL1 registers. Signed-off-by: Marc Zyngier --- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../testing/selftests/kvm/arm64/idreg-idst.c | 117 ++++++++++++++++++ 2 files changed, 118 insertions(+) create mode 100644 tools/testing/selftests/kvm/arm64/idreg-idst.c diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm index 148d427ff24be..fa44e6d9afc35 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -171,6 +171,7 @@ TEST_GEN_PROGS_arm64 += arm64/vgic_irq TEST_GEN_PROGS_arm64 += arm64/vgic_lpi_stress TEST_GEN_PROGS_arm64 += arm64/vpmu_counter_access TEST_GEN_PROGS_arm64 += arm64/no-vgic-v3 +TEST_GEN_PROGS_arm64 += arm64/idreg-idst TEST_GEN_PROGS_arm64 += arm64/kvm-uuid TEST_GEN_PROGS_arm64 += access_tracking_perf_test TEST_GEN_PROGS_arm64 += arch_timer diff --git a/tools/testing/selftests/kvm/arm64/idreg-idst.c b/tools/testing/selftests/kvm/arm64/idreg-idst.c new file mode 100644 index 0000000000000..9ca9f125abdb7 --- /dev/null +++ b/tools/testing/selftests/kvm/arm64/idreg-idst.c @@ -0,0 +1,117 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Access all FEAT_IDST-handled registers that depend on more than + * just FEAT_AA64, and fail if we don't get an a trap with an 0x18 EC. + */ + +#include +#include +#include + +static volatile bool sys64, undef; + +#define __check_sr_read(r) \ + ({ \ + uint64_t val; \ + \ + sys64 = false; \ + undef = false; \ + dsb(sy); \ + val = read_sysreg_s(SYS_ ## r); \ + val; \ + }) + +/* Fatal checks */ +#define check_sr_read(r) \ + do { \ + __check_sr_read(r); \ + __GUEST_ASSERT(!undef, #r " unexpected UNDEF"); \ + __GUEST_ASSERT(sys64, #r " didn't trap"); \ + } while(0) + + +static void guest_code(void) +{ + check_sr_read(CCSIDR2_EL1); + check_sr_read(SMIDR_EL1); + check_sr_read(GMID_EL1); + + GUEST_DONE(); +} + +static void guest_sys64_handler(struct ex_regs *regs) +{ + sys64 = true; + undef = false; + regs->pc += 4; +} + +static void guest_undef_handler(struct ex_regs *regs) +{ + sys64 = false; + undef = true; + regs->pc += 4; +} + +static void test_run_vcpu(struct kvm_vcpu *vcpu) +{ + struct ucall uc; + + do { + vcpu_run(vcpu); + + switch (get_ucall(vcpu, &uc)) { + case UCALL_ABORT: + REPORT_GUEST_ASSERT(uc); + break; + case UCALL_PRINTF: + printf("%s", uc.buffer); + break; + case UCALL_DONE: + break; + default: + TEST_FAIL("Unknown ucall %lu", uc.cmd); + } + } while (uc.cmd != UCALL_DONE); +} + +static void test_guest_feat_idst(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + + /* This VM has no MTE, no SME, no CCIDX */ + vm = vm_create_with_one_vcpu(&vcpu, guest_code); + + vm_init_descriptor_tables(vm); + vcpu_init_descriptor_tables(vcpu); + + vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT, + ESR_ELx_EC_SYS64, guest_sys64_handler); + vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT, + ESR_ELx_EC_UNKNOWN, guest_undef_handler); + + test_run_vcpu(vcpu); + + kvm_vm_free(vm); +} + +int main(int argc, char *argv[]) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + uint64_t mmfr2; + + test_disable_default_vgic(); + + vm = vm_create_with_one_vcpu(&vcpu, NULL); + mmfr2 = vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_ID_AA64MMFR2_EL1)); + __TEST_REQUIRE(FIELD_GET(ID_AA64MMFR2_EL1_IDS, mmfr2) > 0, + "FEAT_IDST not supported"); + kvm_vm_free(vm); + + test_guest_feat_idst(); + + return 0; +} -- 2.47.3