From patchwork Thu Dec 12 15:55:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13905487 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id EBAE4236FA1; Thu, 12 Dec 2024 15:58:05 +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=1734019087; cv=none; b=eEHOgBQImxXku3L5rSutDj2P1NJ8JAjgXkAbq/mkxLWMMRnHSeYjrUPkLi/NwPAKGxsF06ozFfkELR9OyvsjMUCZrsivGc76nZpRuswhsyNiAQhVqGw9Dh6bvMtgGdThy/Y1LgmBg73ZzFJDpKQ5XzZWciGuu+c5uGt3s/JVEQQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734019087; c=relaxed/simple; bh=oK3JUX3S44Ps5W/fqdGIxxk7AMZjPKwaJTimRf0ENZM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mMuuiz2OdhhOxOdLw2PMymDI9Gp9Jew7jbp2AL/jtY8QaDKcDPwZ3NFmgbIIq4nUKiBuvrVke3b/le2Z2I6bZ0c2+Ng3jQxRbR22k7XN+jsoILtti3c0ZPEYl47Zw/QiHeyMTIogSwRD8+cO2INSABoM9G3T8JJ9excYZXGQONw= 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 9A42A176C; Thu, 12 Dec 2024 07:58:33 -0800 (PST) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.39.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2BB5A3F720; Thu, 12 Dec 2024 07:58:02 -0800 (PST) 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 , "Aneesh Kumar K . V" Subject: [PATCH v6 23/43] KVM: arm64: Handle Realm PSCI requests Date: Thu, 12 Dec 2024 15:55:48 +0000 Message-ID: <20241212155610.76522-24-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241212155610.76522-1-steven.price@arm.com> References: <20241212155610.76522-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The RMM needs to be informed of the target REC when a PSCI call is made with an MPIDR argument. Expose an ioctl to the userspace in case the PSCI is handled by it. Co-developed-by: Suzuki K Poulose Signed-off-by: Suzuki K Poulose Signed-off-by: Steven Price --- arch/arm64/include/asm/kvm_rme.h | 3 +++ arch/arm64/kvm/arm.c | 25 +++++++++++++++++++++++++ arch/arm64/kvm/psci.c | 29 +++++++++++++++++++++++++++++ arch/arm64/kvm/rme.c | 15 +++++++++++++++ 4 files changed, 72 insertions(+) diff --git a/arch/arm64/include/asm/kvm_rme.h b/arch/arm64/include/asm/kvm_rme.h index 158f77e24a26..90a4537ad38d 100644 --- a/arch/arm64/include/asm/kvm_rme.h +++ b/arch/arm64/include/asm/kvm_rme.h @@ -113,6 +113,9 @@ int realm_set_ipa_state(struct kvm_vcpu *vcpu, unsigned long addr, unsigned long end, unsigned long ripas, unsigned long *top_ipa); +int realm_psci_complete(struct kvm_vcpu *calling, + struct kvm_vcpu *target, + unsigned long status); #define RMM_RTT_BLOCK_LEVEL 2 #define RMM_RTT_MAX_LEVEL 3 diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index f588b528c3f9..eff1a4ec892b 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1745,6 +1745,22 @@ static int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu, return __kvm_arm_vcpu_set_events(vcpu, events); } +static int kvm_arm_vcpu_rmm_psci_complete(struct kvm_vcpu *vcpu, + struct kvm_arm_rmm_psci_complete *arg) +{ + struct kvm_vcpu *target = kvm_mpidr_to_vcpu(vcpu->kvm, arg->target_mpidr); + + if (!target) + return -EINVAL; + + /* + * RMM v1.0 only supports PSCI_RET_SUCCESS or PSCI_RET_DENIED + * for the status. But, let us leave it to the RMM to filter + * for making this future proof. + */ + return realm_psci_complete(vcpu, target, arg->psci_status); +} + long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -1867,6 +1883,15 @@ long kvm_arch_vcpu_ioctl(struct file *filp, return kvm_arm_vcpu_finalize(vcpu, what); } + case KVM_ARM_VCPU_RMM_PSCI_COMPLETE: { + struct kvm_arm_rmm_psci_complete req; + + if (!kvm_is_realm(vcpu->kvm)) + return -EINVAL; + if (copy_from_user(&req, argp, sizeof(req))) + return -EFAULT; + return kvm_arm_vcpu_rmm_psci_complete(vcpu, &req); + } default: r = -EINVAL; } diff --git a/arch/arm64/kvm/psci.c b/arch/arm64/kvm/psci.c index 3b5dbe9a0a0e..9dc161abc30c 100644 --- a/arch/arm64/kvm/psci.c +++ b/arch/arm64/kvm/psci.c @@ -103,6 +103,12 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu) reset_state->reset = true; kvm_make_request(KVM_REQ_VCPU_RESET, vcpu); + /* + * Make sure we issue PSCI_COMPLETE before the VCPU can be + * scheduled. + */ + if (vcpu_is_rec(vcpu)) + realm_psci_complete(source_vcpu, vcpu, PSCI_RET_SUCCESS); /* * Make sure the reset request is observed if the RUNNABLE mp_state is @@ -115,6 +121,10 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu) out_unlock: spin_unlock(&vcpu->arch.mp_state_lock); + if (vcpu_is_rec(vcpu) && ret != PSCI_RET_SUCCESS) + realm_psci_complete(source_vcpu, vcpu, + ret == PSCI_RET_ALREADY_ON ? + PSCI_RET_SUCCESS : PSCI_RET_DENIED); return ret; } @@ -142,6 +152,25 @@ static unsigned long kvm_psci_vcpu_affinity_info(struct kvm_vcpu *vcpu) /* Ignore other bits of target affinity */ target_affinity &= target_affinity_mask; + if (vcpu_is_rec(vcpu)) { + struct kvm_vcpu *target_vcpu; + + /* RMM supports only zero affinity level */ + if (lowest_affinity_level != 0) + return PSCI_RET_INVALID_PARAMS; + + target_vcpu = kvm_mpidr_to_vcpu(kvm, target_affinity); + if (!target_vcpu) + return PSCI_RET_INVALID_PARAMS; + + /* + * Provide the references of running and target RECs to the RMM + * so that the RMM can complete the PSCI request. + */ + realm_psci_complete(vcpu, target_vcpu, PSCI_RET_SUCCESS); + return PSCI_RET_SUCCESS; + } + /* * If one or more VCPU matching target affinity are running * then ON else OFF diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c index 146ef598a581..5831d379760a 100644 --- a/arch/arm64/kvm/rme.c +++ b/arch/arm64/kvm/rme.c @@ -118,6 +118,21 @@ static void free_delegated_granule(phys_addr_t phys) free_page((unsigned long)phys_to_virt(phys)); } +int realm_psci_complete(struct kvm_vcpu *calling, struct kvm_vcpu *target, + unsigned long status) +{ + int ret; + + ret = rmi_psci_complete(virt_to_phys(calling->arch.rec.rec_page), + virt_to_phys(target->arch.rec.rec_page), + status); + + if (ret) + return -EINVAL; + + return 0; +} + static int realm_rtt_create(struct realm *realm, unsigned long addr, int level,