From patchwork Wed Feb 15 01:07:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Raghavendra Rao Ananta X-Patchwork-Id: 13141117 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 15FA9C6379F for ; Wed, 15 Feb 2023 01:08:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233165AbjBOBIB (ORCPT ); Tue, 14 Feb 2023 20:08:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232972AbjBOBHx (ORCPT ); Tue, 14 Feb 2023 20:07:53 -0500 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 530C932516 for ; Tue, 14 Feb 2023 17:07:31 -0800 (PST) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-52ec7c792b1so155291387b3.5 for ; Tue, 14 Feb 2023 17:07:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=9BAtKaaHohTEAYMjD0cR4uj3MWVe56GuEhp9bvwPfa4=; b=Yj822Ifz/waLQy8MmSjHN2pZu32oORMwB771wgCi32mwkJC0hUQpN1N/nWxoPuQKkY MR5Obqol9/aE1XAhNk7AVogHzndhjoI3zj/ErGMJSzobg1QkdKs40EF9od/2mDXGl3Mr vML3D5iNNfD1nb34vZDllfCbGcaAnWRYJUliZNg+yJkjJr9xtUkHpwrusRFPJfJbTXvS iIZLxpFggJQJTFRdLpI55cjbpErqmMuA8qkkrcU08xAnYu4PDLbIWuBAlSrsut48bP65 31IIpqq6lv+RfBeb3Rip0r7AbEsVn78niJMaW1e4tKNTl7PeTbGqq+6vGsP827kL6i0p hNoQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=9BAtKaaHohTEAYMjD0cR4uj3MWVe56GuEhp9bvwPfa4=; b=1swuRMHMvVq68wWLhIeKIQ9NXnfValfsDrN5mrFps1WBnxHEc0K+yur6szDcSxnVuF YxbFfL88DohE5Op5PuNzhwvqkXFgVrLRRIeBD14CzYoUCwzyEzr3NlUD4yBlRhS/2Lyn 6wMe+MxHeFsALTSPou8Hd3E9H6ujtlTM/TFdB9ureR2EjsZLLg3eptKe8eZ4FeDjMAkK 6kpOKgV5nTNetNPpKvgZ31dTmckcE++SeTuRDLcaEcsiNwrKRDVwpIvU43zPc+gs476Y F4rIWakwn1eODVXgDBKfaiOGOXPycTXpA3t01RQalBN0Izgg7A2r31EakMXZux2LlYdT wHMA== X-Gm-Message-State: AO0yUKXtQJpaqZ4Rsfmzmz+P10A6JQfrwKpUDfv/MoFNWHpzYOr0GDhB 3Odmi2oBqCp2QbALnIclivogIOK6M+7V X-Google-Smtp-Source: AK7set9KQp5+rmM+igHZkkICMtVguIIXyRbXqTvu6s5OOn6LZ8Hz4m5ENjHy86UYN6YyxNTRrDsY/D2AXKXH X-Received: from rananta-linux.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:22b5]) (user=rananta job=sendgmr) by 2002:a81:ae0b:0:b0:530:a340:bcd7 with SMTP id m11-20020a81ae0b000000b00530a340bcd7mr0ywh.8.1676423250349; Tue, 14 Feb 2023 17:07:30 -0800 (PST) Date: Wed, 15 Feb 2023 01:07:09 +0000 In-Reply-To: <20230215010717.3612794-1-rananta@google.com> Mime-Version: 1.0 References: <20230215010717.3612794-1-rananta@google.com> X-Mailer: git-send-email 2.39.1.581.gbfd45094c4-goog Message-ID: <20230215010717.3612794-9-rananta@google.com> Subject: [REPOST PATCH 08/16] selftests: KVM: aarch64: Consider PMU event filters for VM creation From: Raghavendra Rao Ananta To: Oliver Upton , Reiji Watanabe , Marc Zyngier , Ricardo Koller , James Morse , Suzuki K Poulose Cc: Paolo Bonzini , Jing Zhang , Colton Lewis , Raghavendra Rao Anata , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Accept a list of KVM PMU event filters as an argument while creating a VM via create_vpmu_vm(). Upcoming patches would leverage this to test the event filters' functionality. No functional change intended. Signed-off-by: Raghavendra Rao Ananta --- .../testing/selftests/kvm/aarch64/vpmu_test.c | 64 +++++++++++++++++-- 1 file changed, 60 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/kvm/aarch64/vpmu_test.c b/tools/testing/selftests/kvm/aarch64/vpmu_test.c index 15aebc7d7dc94..2b3a4fa3afa9c 100644 --- a/tools/testing/selftests/kvm/aarch64/vpmu_test.c +++ b/tools/testing/selftests/kvm/aarch64/vpmu_test.c @@ -15,10 +15,14 @@ #include #include #include +#include /* The max number of the PMU event counters (excluding the cycle counter) */ #define ARMV8_PMU_MAX_GENERAL_COUNTERS (ARMV8_PMU_MAX_COUNTERS - 1) +/* The max number of event numbers that's supported */ +#define ARMV8_PMU_MAX_EVENTS 64 + /* * The macros and functions below for reading/writing PMEV{CNTR,TYPER}_EL0 * were basically copied from arch/arm64/kernel/perf_event.c. @@ -224,6 +228,8 @@ struct pmc_accessor pmc_accessors[] = { { read_sel_evcntr, write_pmevcntrn, read_sel_evtyper, write_pmevtypern }, }; +#define MAX_EVENT_FILTERS_PER_VM 10 + #define INVALID_EC (-1ul) uint64_t expected_ec = INVALID_EC; uint64_t op_end_addr; @@ -232,6 +238,7 @@ struct vpmu_vm { struct kvm_vm *vm; struct kvm_vcpu *vcpu; int gic_fd; + unsigned long *pmu_filter; }; enum test_stage { @@ -541,8 +548,51 @@ static void guest_code(void) #define GICD_BASE_GPA 0x8000000ULL #define GICR_BASE_GPA 0x80A0000ULL +static unsigned long * +set_event_filters(struct kvm_vcpu *vcpu, struct kvm_pmu_event_filter *pmu_event_filters) +{ + int j; + unsigned long *pmu_filter; + struct kvm_device_attr filter_attr = { + .group = KVM_ARM_VCPU_PMU_V3_CTRL, + .attr = KVM_ARM_VCPU_PMU_V3_FILTER, + }; + + /* + * Setting up of the bitmap is similar to what KVM does. + * If the first filter denys an event, default all the others to allow, and vice-versa. + */ + pmu_filter = bitmap_zalloc(ARMV8_PMU_MAX_EVENTS); + TEST_ASSERT(pmu_filter, "Failed to allocate the pmu_filter"); + + if (pmu_event_filters[0].action == KVM_PMU_EVENT_DENY) + bitmap_fill(pmu_filter, ARMV8_PMU_MAX_EVENTS); + + for (j = 0; j < MAX_EVENT_FILTERS_PER_VM; j++) { + struct kvm_pmu_event_filter *pmu_event_filter = &pmu_event_filters[j]; + + if (!pmu_event_filter->nevents) + break; + + pr_debug("Applying event filter:: event: 0x%x; action: %s\n", + pmu_event_filter->base_event, + pmu_event_filter->action == KVM_PMU_EVENT_ALLOW ? "ALLOW" : "DENY"); + + filter_attr.addr = (uint64_t) pmu_event_filter; + vcpu_ioctl(vcpu, KVM_SET_DEVICE_ATTR, &filter_attr); + + if (pmu_event_filter->action == KVM_PMU_EVENT_ALLOW) + __set_bit(pmu_event_filter->base_event, pmu_filter); + else + __clear_bit(pmu_event_filter->base_event, pmu_filter); + } + + return pmu_filter; +} + /* Create a VM that has one vCPU with PMUv3 configured. */ -static struct vpmu_vm *create_vpmu_vm(void *guest_code) +static struct vpmu_vm * +create_vpmu_vm(void *guest_code, struct kvm_pmu_event_filter *pmu_event_filters) { struct kvm_vm *vm; struct kvm_vcpu *vcpu; @@ -586,6 +636,9 @@ static struct vpmu_vm *create_vpmu_vm(void *guest_code) "Unexpected PMUVER (0x%x) on the vCPU with PMUv3", pmuver); /* Initialize vPMU */ + if (pmu_event_filters) + vpmu_vm->pmu_filter = set_event_filters(vcpu, pmu_event_filters); + vcpu_ioctl(vcpu, KVM_SET_DEVICE_ATTR, &irq_attr); vcpu_ioctl(vcpu, KVM_SET_DEVICE_ATTR, &init_attr); @@ -594,6 +647,8 @@ static struct vpmu_vm *create_vpmu_vm(void *guest_code) static void destroy_vpmu_vm(struct vpmu_vm *vpmu_vm) { + if (vpmu_vm->pmu_filter) + bitmap_free(vpmu_vm->pmu_filter); close(vpmu_vm->gic_fd); kvm_vm_free(vpmu_vm->vm); free(vpmu_vm); @@ -631,7 +686,7 @@ static void run_counter_access_test(uint64_t pmcr_n) guest_data.expected_pmcr_n = pmcr_n; pr_debug("Test with pmcr_n %lu\n", pmcr_n); - vpmu_vm = create_vpmu_vm(guest_code); + vpmu_vm = create_vpmu_vm(guest_code, NULL); vcpu = vpmu_vm->vcpu; /* Save the initial sp to restore them later to run the guest again */ @@ -676,7 +731,7 @@ static void run_counter_access_error_test(uint64_t pmcr_n) guest_data.expected_pmcr_n = pmcr_n; pr_debug("Error test with pmcr_n %lu (larger than the host)\n", pmcr_n); - vpmu_vm = create_vpmu_vm(guest_code); + vpmu_vm = create_vpmu_vm(guest_code, NULL); vcpu = vpmu_vm->vcpu; /* Update the PMCR_EL0.N with @pmcr_n */ @@ -719,9 +774,10 @@ static uint64_t get_pmcr_n_limit(void) struct vpmu_vm *vpmu_vm; uint64_t pmcr; - vpmu_vm = create_vpmu_vm(guest_code); + vpmu_vm = create_vpmu_vm(guest_code, NULL); vcpu_get_reg(vpmu_vm->vcpu, KVM_ARM64_SYS_REG(SYS_PMCR_EL0), &pmcr); destroy_vpmu_vm(vpmu_vm); + return FIELD_GET(ARMV8_PMU_PMCR_N, pmcr); }