From patchwork Wed Aug 21 15:38:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13771818 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id B33041C86EF; Wed, 21 Aug 2024 15:41:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724254869; cv=none; b=XSuAitHesU36yOGn5fmAjxyAaJKSALMCk7Z82GZeXu6cshB3aUwknRxvQlmkstpy7rg5bJX0guJW0v2YF62GRTAwWKuhFtybUaRxfmfc2SO4dE82hpHuWLhfdHas+2slLEbpSUE3h5PY8V3lzSDoI4GjeSRL03jwX4OHkFKcsso= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724254869; c=relaxed/simple; bh=XbeSE+GrypNYOmghS5MXT2zToOaLm6FTMtfd7i+6EYA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=SscctmVGgT9t3RGpydZVRVTjdddk6+YOJILZ3XYa/TyA6ey/H3ie8e/KcmntbjhShkI15wEjFsKOmGkSvmxlovRcp/pHGvUAF/wptdWXEvHfDBVc7jtJixO2B5qH5V5UuXXPP0Bwu9e+o5H9jktITT3X/OThVxtntoDkGE+uGUg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 71999DA7; Wed, 21 Aug 2024 08:41:33 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.37.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 01EBA3F73B; Wed, 21 Aug 2024 08:41:03 -0700 (PDT) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Gavin Shan , Shanker Donthineni , Alper Gun Subject: [PATCH v4 33/43] arm64: rme: Enable PMU support with a realm guest Date: Wed, 21 Aug 2024 16:38:34 +0100 Message-Id: <20240821153844.60084-34-steven.price@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240821153844.60084-1-steven.price@arm.com> References: <20240821153844.60084-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Use the PMU registers from the RmiRecExit structure to identify when an overflow interrupt is due and inject it into the guest. Also hook up the configuration option for enabling the PMU within the guest. When entering a realm guest with a PMU interrupt pending, it is necessary to disable the physical interrupt. Otherwise when the RMM restores the PMU state the physical interrupt will trigger causing an immediate exit back to the host. The guest is expected to acknowledge the interrupt causing a host exit (to update the GIC state) which gives the opportunity to re-enable the physical interrupt before the next PMU event. Number of PMU counters is configured by the VMM by writing to PMCR.N. Signed-off-by: Steven Price --- Changes since v2: * Add a macro kvm_pmu_get_irq_level() to avoid compile issues when PMU support is disabled. --- arch/arm64/kvm/arm.c | 11 +++++++++++ arch/arm64/kvm/guest.c | 7 +++++++ arch/arm64/kvm/pmu-emul.c | 4 +++- arch/arm64/kvm/rme.c | 8 ++++++++ arch/arm64/kvm/sys_regs.c | 2 +- include/kvm/arm_pmu.h | 4 ++++ 6 files changed, 34 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index bb9b9788aa94..fe815a0d20bf 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -1227,6 +1228,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) run->exit_reason = KVM_EXIT_UNKNOWN; run->flags = 0; while (ret > 0) { + bool pmu_stopped = false; + /* * Check conditions before entering the guest */ @@ -1258,6 +1261,11 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) kvm_pmu_flush_hwstate(vcpu); + if (vcpu_is_rec(vcpu) && kvm_pmu_get_irq_level(vcpu)) { + pmu_stopped = true; + arm_pmu_set_phys_irq(false); + } + local_irq_disable(); kvm_vgic_flush_hwstate(vcpu); @@ -1360,6 +1368,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) preempt_enable(); + if (pmu_stopped) + arm_pmu_set_phys_irq(true); + /* * The ARMv8 architecture doesn't give the hypervisor * a mechanism to prevent a guest from dropping to AArch32 EL0 diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 88c07c880e88..24d8220c1d67 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -783,6 +783,8 @@ int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) return kvm_arm_sys_reg_get_reg(vcpu, reg); } +#define KVM_REG_ARM_PMCR_EL0 ARM64_SYS_REG(3, 3, 9, 12, 0) + /* * The RMI ABI only enables setting the lower GPRs (x0-x7) and PC. * All other registers are reset to architectural or otherwise defined reset @@ -801,6 +803,11 @@ static bool validate_realm_set_reg(struct kvm_vcpu *vcpu, case KVM_REG_ARM_CORE_REG(regs.pc): return true; } + } else { + switch (reg->id) { + case KVM_REG_ARM_PMCR_EL0: + return true; + } } return false; diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index 82a2a003259c..e3dc2363543b 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -340,7 +340,9 @@ static u64 kvm_pmu_overflow_status(struct kvm_vcpu *vcpu) { u64 reg = 0; - if ((kvm_vcpu_read_pmcr(vcpu) & ARMV8_PMU_PMCR_E)) { + if (vcpu_is_rec(vcpu)) { + reg = vcpu->arch.rec.run->exit.pmu_ovf_status; + } else if ((kvm_vcpu_read_pmcr(vcpu) & ARMV8_PMU_PMCR_E)) { reg = __vcpu_sys_reg(vcpu, PMOVSSET_EL0); reg &= __vcpu_sys_reg(vcpu, PMCNTENSET_EL0); reg &= __vcpu_sys_reg(vcpu, PMINTENSET_EL1); diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c index 999bd4bf2d73..93757c550394 100644 --- a/arch/arm64/kvm/rme.c +++ b/arch/arm64/kvm/rme.c @@ -325,6 +325,11 @@ static int realm_create_rd(struct kvm *kvm) params->rtt_base = kvm->arch.mmu.pgd_phys; params->vmid = realm->vmid; + if (kvm->arch.arm_pmu) { + params->pmu_num_ctrs = kvm->arch.pmcr_n; + params->flags |= RMI_REALM_PARAM_FLAG_PMU; + } + params_phys = virt_to_phys(params); if (rmi_realm_create(rd_phys, params_phys)) { @@ -1398,6 +1403,9 @@ int kvm_create_rec(struct kvm_vcpu *vcpu) if (!vcpu_has_feature(vcpu, KVM_ARM_VCPU_PSCI_0_2)) return -EINVAL; + if (vcpu->kvm->arch.arm_pmu && !kvm_vcpu_has_pmu(vcpu)) + return -EINVAL; + BUILD_BUG_ON(sizeof(*params) > PAGE_SIZE); BUILD_BUG_ON(sizeof(*rec->run) > PAGE_SIZE); diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index c90324060436..39a1ea231a09 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1286,7 +1286,7 @@ static int set_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r, * implements. Ignore this error to maintain compatibility * with the existing KVM behavior. */ - if (!kvm_vm_has_ran_once(kvm) && + if (!kvm_vm_has_ran_once(kvm) && !kvm_realm_is_created(kvm) && new_n <= kvm_arm_pmu_get_max_counters(kvm)) kvm->arch.pmcr_n = new_n; diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h index 35d4ca4f6122..e2d31640e2e7 100644 --- a/include/kvm/arm_pmu.h +++ b/include/kvm/arm_pmu.h @@ -76,6 +76,8 @@ void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu); void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu); void kvm_vcpu_pmu_resync_el0(void); +#define kvm_pmu_get_irq_level(vcpu) ((vcpu)->arch.pmu.irq_level) + #define kvm_vcpu_has_pmu(vcpu) \ (vcpu_has_feature(vcpu, KVM_ARM_VCPU_PMU_V3)) @@ -157,6 +159,8 @@ static inline u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1) return 0; } +#define kvm_pmu_get_irq_level(vcpu) (false) + #define kvm_vcpu_has_pmu(vcpu) ({ false; }) static inline void kvm_pmu_update_vcpu_events(struct kvm_vcpu *vcpu) {} static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {}