From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DB129E9371F for ; Mon, 9 Oct 2023 23:11:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379042AbjJIXLD (ORCPT ); Mon, 9 Oct 2023 19:11:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60130 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234640AbjJIXKN (ORCPT ); Mon, 9 Oct 2023 19:10:13 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5D88DC4 for ; Mon, 9 Oct 2023 16:09:17 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id 3f1490d57ef6-d8997e79faeso5373050276.1 for ; Mon, 09 Oct 2023 16:09:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1696892956; x=1697497756; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=YnaZ+HwT0CqGHphe+RXzr+4BdI3+Wxoy/2h4yWVjWqk=; b=XYiy411LA8tZViU1AzmySXHq9zlzeu0YetPWnF2J3Mm/soQ4R9hUh6e9bgTXNS+tU8 MQD40+aFgPdtr/VCrGje1T+8AVuLvjbknpYYiz1zTO7zHwxfn+SMS39fDNobfJ1ipTHv e0H3gnLDoSPZkgYC04f4pVRbwtDKsi9v60s0nsou1YRkgHIAEmPf6XQh69LNd8xUKieI UBHM5/hm4HDSWjqVhk6V/ahLd86xwO2I2zYpdVLlriWGSHjM4UItzogJav0cyET9ZfE6 TX6ljzoZiOGunBse7AqtfVwNQNzoEszNTrsyFJew4h8wZIxOo6403pIAXVKWK28P8rKx KsBQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696892956; x=1697497756; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=YnaZ+HwT0CqGHphe+RXzr+4BdI3+Wxoy/2h4yWVjWqk=; b=Zi0UTFLZfWzgWMIxP4UkAWamzjCABA5rmrfmjHdIvXqVxmHyn3Qjo/k75llJauAPac fvFxpPRk11L8+OCKPn8md2byQZrjzj8+uOKDDeR28CNRInTgV+5HWlG7elthHoZJtwMJ IGQMWnu523d1OqGN7pFj7LNoji+RWphOFEb+FSfYHBftaft+tfH5gi8i8gNt9F1aWd5H FT27L/vhOVLMMoulP7e4X+ry2oexUxZsLuVCGqn+cYKJjDDi9olt4JRNw4axzaMfhEMr WhuLEjNNr2D1UnL3hftotQZJSjGLANxtPAu2guxYR+Gw9XX0wIIk82zGV6WdgzZRooL+ ++iA== X-Gm-Message-State: AOJu0Yyx2oNfkBWpnBXlsLYgOmU7SemOzlcd3Uw0QTuLIkKVXdV19fyo 3Mu7HywzfjRQ2fc7mrckssI627KYPKrW X-Google-Smtp-Source: AGHT+IH1FjsEh0LooC7Dv3FFBpESan9OVAH7g70S+Mf8O6PjhBewcaz+ezN3g+mcbaXqTeognYK/Mgxj9zy3 X-Received: from rananta-linux.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:20a1]) (user=rananta job=sendgmr) by 2002:a25:d64f:0:b0:d9a:4cc1:b59a with SMTP id n76-20020a25d64f000000b00d9a4cc1b59amr23035ybg.1.1696892956142; Mon, 09 Oct 2023 16:09:16 -0700 (PDT) Date: Mon, 9 Oct 2023 23:08:58 +0000 In-Reply-To: <20231009230858.3444834-1-rananta@google.com> Mime-Version: 1.0 References: <20231009230858.3444834-1-rananta@google.com> X-Mailer: git-send-email 2.42.0.609.gbb76f46606-goog Message-ID: <20231009230858.3444834-13-rananta@google.com> Subject: [PATCH v7 12/12] KVM: selftests: aarch64: vPMU register test for unimplemented counters From: Raghavendra Rao Ananta To: Oliver Upton , Marc Zyngier Cc: Alexandru Elisei , James Morse , Suzuki K Poulose , Paolo Bonzini , Zenghui Yu , Shaoqin Huang , Jing Zhang , Reiji Watanabe , Colton Lewis , Raghavendra Rao Anata , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Reiji Watanabe Add a new test case to the vpmu_counter_access test to check if PMU registers or their bits for unimplemented counters are not accessible or are RAZ, as expected. Signed-off-by: Reiji Watanabe Signed-off-by: Raghavendra Rao Ananta --- .../kvm/aarch64/vpmu_counter_access.c | 95 +++++++++++++++++-- .../selftests/kvm/include/aarch64/processor.h | 1 + 2 files changed, 87 insertions(+), 9 deletions(-) diff --git a/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c b/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c index e92af3c0db03..788386ac0894 100644 --- a/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c +++ b/tools/testing/selftests/kvm/aarch64/vpmu_counter_access.c @@ -5,8 +5,8 @@ * Copyright (c) 2022 Google LLC. * * This test checks if the guest can see the same number of the PMU event - * counters (PMCR_EL0.N) that userspace sets, and if the guest can access - * those counters. + * counters (PMCR_EL0.N) that userspace sets, if the guest can access + * those counters, and if the guest cannot access any other counters. * This test runs only when KVM_CAP_ARM_PMU_V3 is supported on the host. */ #include @@ -131,9 +131,9 @@ static void write_pmevtypern(int n, unsigned long val) } /* - * The pmc_accessor structure has pointers to PMEVT{CNTR,TYPER}_EL0 + * The pmc_accessor structure has pointers to PMEV{CNTR,TYPER}_EL0 * accessors that test cases will use. Each of the accessors will - * either directly reads/writes PMEVT{CNTR,TYPER}_EL0 + * either directly reads/writes PMEV{CNTR,TYPER}_EL0 * (i.e. {read,write}_pmev{cnt,type}rn()), or reads/writes them through * PMXEV{CNTR,TYPER}_EL0 (i.e. {read,write}_sel_ev{cnt,type}r()). * @@ -291,25 +291,85 @@ static void test_access_pmc_regs(struct pmc_accessor *acc, int pmc_idx) pmc_idx, PMC_ACC_TO_IDX(acc), read_data, write_data); } +#define INVALID_EC (-1ul) +uint64_t expected_ec = INVALID_EC; +uint64_t op_end_addr; + static void guest_sync_handler(struct ex_regs *regs) { uint64_t esr, ec; esr = read_sysreg(esr_el1); ec = (esr >> ESR_EC_SHIFT) & ESR_EC_MASK; - __GUEST_ASSERT(0, "PC: 0x%lx; ESR: 0x%lx; EC: 0x%lx", regs->pc, esr, ec); + + __GUEST_ASSERT(op_end_addr && (expected_ec == ec), + "PC: 0x%lx; ESR: 0x%lx; EC: 0x%lx; EC expected: 0x%lx", + regs->pc, esr, ec, expected_ec); + + /* Will go back to op_end_addr after the handler exits */ + regs->pc = op_end_addr; + + /* + * Clear op_end_addr, and setting expected_ec to INVALID_EC + * as a sign that an exception has occurred. + */ + op_end_addr = 0; + expected_ec = INVALID_EC; +} + +/* + * Run the given operation that should trigger an exception with the + * given exception class. The exception handler (guest_sync_handler) + * will reset op_end_addr to 0, and expected_ec to INVALID_EC, and + * will come back to the instruction at the @done_label. + * The @done_label must be a unique label in this test program. + */ +#define TEST_EXCEPTION(ec, ops, done_label) \ +{ \ + extern int done_label; \ + \ + WRITE_ONCE(op_end_addr, (uint64_t)&done_label); \ + GUEST_ASSERT(ec != INVALID_EC); \ + WRITE_ONCE(expected_ec, ec); \ + dsb(ish); \ + ops; \ + asm volatile(#done_label":"); \ + GUEST_ASSERT(!op_end_addr); \ + GUEST_ASSERT(expected_ec == INVALID_EC); \ +} + +/* + * Tests for reading/writing registers for the unimplemented event counter + * specified by @pmc_idx (>= PMCR_EL0.N). + */ +static void test_access_invalid_pmc_regs(struct pmc_accessor *acc, int pmc_idx) +{ + /* + * Reading/writing the event count/type registers should cause + * an UNDEFINED exception. + */ + TEST_EXCEPTION(ESR_EC_UNKNOWN, acc->read_cntr(pmc_idx), inv_rd_cntr); + TEST_EXCEPTION(ESR_EC_UNKNOWN, acc->write_cntr(pmc_idx, 0), inv_wr_cntr); + TEST_EXCEPTION(ESR_EC_UNKNOWN, acc->read_typer(pmc_idx), inv_rd_typer); + TEST_EXCEPTION(ESR_EC_UNKNOWN, acc->write_typer(pmc_idx, 0), inv_wr_typer); + /* + * The bit corresponding to the (unimplemented) counter in + * {PMCNTEN,PMOVS}{SET,CLR}_EL1 registers should be RAZ. + */ + test_bitmap_pmu_regs(pmc_idx, 1); + test_bitmap_pmu_regs(pmc_idx, 0); } /* * The guest is configured with PMUv3 with @expected_pmcr_n number of * event counters. * Check if @expected_pmcr_n is consistent with PMCR_EL0.N, and - * if reading/writing PMU registers for implemented counters can work - * as expected. + * if reading/writing PMU registers for implemented or unimplemented + * counters can work as expected. */ static void guest_code(uint64_t expected_pmcr_n) { - uint64_t pmcr, pmcr_n; + uint64_t pmcr, pmcr_n, unimp_mask; int i, pmc; __GUEST_ASSERT(expected_pmcr_n <= ARMV8_PMU_MAX_GENERAL_COUNTERS, @@ -324,15 +384,32 @@ static void guest_code(uint64_t expected_pmcr_n) "Expected PMCR.N: 0x%lx, PMCR.N: 0x%lx", pmcr_n, expected_pmcr_n); + /* + * Make sure that (RAZ) bits corresponding to unimplemented event + * counters in {PMCNTEN,PMOVS}{SET,CLR}_EL1 registers are reset to zero. + * (NOTE: bits for implemented event counters are reset to UNKNOWN) + */ + unimp_mask = GENMASK_ULL(ARMV8_PMU_MAX_GENERAL_COUNTERS - 1, pmcr_n); + check_bitmap_pmu_regs(unimp_mask, false); + /* * Tests for reading/writing PMU registers for implemented counters. - * Use each combination of PMEVT{CNTR,TYPER}_EL0 accessor functions. + * Use each combination of PMEV{CNTR,TYPER}_EL0 accessor functions. */ for (i = 0; i < ARRAY_SIZE(pmc_accessors); i++) { for (pmc = 0; pmc < pmcr_n; pmc++) test_access_pmc_regs(&pmc_accessors[i], pmc); } + /* + * Tests for reading/writing PMU registers for unimplemented counters. + * Use each combination of PMEV{CNTR,TYPER}_EL0 accessor functions. + */ + for (i = 0; i < ARRAY_SIZE(pmc_accessors); i++) { + for (pmc = pmcr_n; pmc < ARMV8_PMU_MAX_GENERAL_COUNTERS; pmc++) + test_access_invalid_pmc_regs(&pmc_accessors[i], pmc); + } + GUEST_DONE(); } diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h index cb537253a6b9..c42d683102c7 100644 --- a/tools/testing/selftests/kvm/include/aarch64/processor.h +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h @@ -104,6 +104,7 @@ enum { #define ESR_EC_SHIFT 26 #define ESR_EC_MASK (ESR_EC_NUM - 1) +#define ESR_EC_UNKNOWN 0x0 #define ESR_EC_SVC64 0x15 #define ESR_EC_IABT 0x21 #define ESR_EC_DABT 0x25 -- 2.42.0.609.gbb76f46606-goog