From patchwork Mon Mar 18 16:14:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 13595580 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 82E004A9BF; Mon, 18 Mar 2024 16:47:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710780431; cv=none; b=Gtl32L5vVjVx94schzFqlon71AK2PvW3eJqmSIcshFjC+E+IvZQfrhgiGfnNlx8EsFF8b4LQBKcLWhfPFzhmmJFmSXyLwtrzSgKH6DKxkVMOlqJqzaang1v86yqfDpck4P1F9JdgobFIKzgFyOLZZRkaP5X7vqjWmx13yuuySeg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710780431; c=relaxed/simple; bh=DLpACTWgg6UtjxsumUlE13iTjn9+HG31gwbzCwRyKA0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QAS3yP4vba/wiF2F1Kf885dIqSvYBzvJ2hOrPReFdbT7M6IZ46TsdTXDJkEy5L5/s64o+iC8gQJ1SCzbFZbImv4+zYDifHLyTYG3NbqT9WeD3wdfSUxKpsY2Tsj++Vkm/D2J3chbl07UxICAqP23P801jBTBFB6pd7wpM6FU9u0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=HKmXTHdT; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="HKmXTHdT" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=gpbsniFgtOHZgJp8y3v9VSnosB7+jAV6rr5l+o89n6M=; b=HKmXTHdTTZMqF1ebxpIkrA5AsZ C8J6BC5ZewVFQ8NI16Fla1sRbIWFe4/EAa9bMgApSmJe/DQUBE5esC/8gW+J+lwaLng2I8MAsLHv6 sG2By0Y0OJ5BlRDi0oUqUQnpVVTe8ZY3gGHBbMrYI6FYK5B47f2Nv7Mmv/mr8aeTTdfCdGWXffweK viBXqYUP0AZIR+70B6ffXypChI3qF724oGBbD1MlJ7lTNQyrmVnDrOH7KwRfY8bseXoRKZqU8mknX EPP7e9pJ6zg4Idtvnbna4SduTAVenAQ/NTmruHGv1MqT6W+ZeK+AL9o61BQNr7zQWixDzsyqKivwJ s2fIwQUQ==; Received: from [2001:8b0:10b:1::ebe] (helo=i7.infradead.org) by desiato.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1rmG8Z-0000000CjyC-1kfg; Mon, 18 Mar 2024 16:46:59 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1rmG8W-00000004F1D-0s8n; Mon, 18 Mar 2024 16:46:56 +0000 From: David Woodhouse To: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Paolo Bonzini , Jonathan Corbet , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Mark Rutland , Lorenzo Pieralisi , "Rafael J. Wysocki" , Len Brown , Pavel Machek , David Woodhouse , Mostafa Saleh , Jean-Philippe Brucker , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-pm@vger.kernel.org Subject: [RFC PATCH v2 1/4] firmware/psci: Add definitions for PSCI v1.3 specification (ALPHA) Date: Mon, 18 Mar 2024 16:14:23 +0000 Message-ID: <20240318164646.1010092-2-dwmw2@infradead.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240318164646.1010092-1-dwmw2@infradead.org> References: <20240318164646.1010092-1-dwmw2@infradead.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html From: David Woodhouse The v1.3 PSCI spec (https://developer.arm.com/documentation/den0022) adds SYSTEM_OFF2, CLEAN_INV_MEMREGION and CLEAN_INV_MEMREGION_ATTRIBUTES functions. Add definitions for them and their parameters, along with the new TIMEOUT, RATE_LIMITED and BUSY error values. Signed-off-by: David Woodhouse --- include/uapi/linux/psci.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/include/uapi/linux/psci.h b/include/uapi/linux/psci.h index 42a40ad3fb62..082ed689fdaf 100644 --- a/include/uapi/linux/psci.h +++ b/include/uapi/linux/psci.h @@ -59,6 +59,8 @@ #define PSCI_1_1_FN_SYSTEM_RESET2 PSCI_0_2_FN(18) #define PSCI_1_1_FN_MEM_PROTECT PSCI_0_2_FN(19) #define PSCI_1_1_FN_MEM_PROTECT_CHECK_RANGE PSCI_0_2_FN(20) +#define PSCI_1_3_FN_SYSTEM_OFF2 PSCI_0_2_FN(21) +#define PSCI_1_3_FN_CLEAN_INV_MEMREGION_ATTRIBUTES PSCI_0_2_FN(23) #define PSCI_1_0_FN64_CPU_DEFAULT_SUSPEND PSCI_0_2_FN64(12) #define PSCI_1_0_FN64_NODE_HW_STATE PSCI_0_2_FN64(13) @@ -68,6 +70,8 @@ #define PSCI_1_1_FN64_SYSTEM_RESET2 PSCI_0_2_FN64(18) #define PSCI_1_1_FN64_MEM_PROTECT_CHECK_RANGE PSCI_0_2_FN64(20) +#define PSCI_1_3_FN64_SYSTEM_OFF2 PSCI_0_2_FN64(21) +#define PSCI_1_3_FN64_CLEAN_INV_MEMREGION PSCI_0_2_FN64(22) /* PSCI v0.2 power state encoding for CPU_SUSPEND function */ #define PSCI_0_2_POWER_STATE_ID_MASK 0xffff @@ -100,6 +104,19 @@ #define PSCI_1_1_RESET_TYPE_SYSTEM_WARM_RESET 0 #define PSCI_1_1_RESET_TYPE_VENDOR_START 0x80000000U +/* PSCI v1.3 hibernate type for SYSTEM_OFF2 */ +#define PSCI_1_3_HIBERNATE_TYPE_OFF 0 + +/* PSCI v1.3 flags for CLEAN_INV_MEMREGION */ +#define PSCI_1_3_CLEAN_INV_MEMREGION_FLAG_DRY_RUN BIT(0) + +/* PSCI v1.3 attributes for CLEAN_INV_MEMREGION_ATTRIBUTES */ +#define PSCI_1_3_CLEAN_INV_MEMREGION_ATTR_OP_TYPE 0 +#define PSCI_1_3_CLEAN_INV_MEMREGION_ATTR_CPU_RDVZ 1 +#define PSCI_1_3_CLEAN_INV_MEMREGION_ATTR_LATENCY 2 +#define PSCI_1_3_CLEAN_INV_MEMREGION_ATTR_RATE_LIMIT 3 +#define PSCI_1_3_CLEAN_INV_MEMREGION_ATTR_TIMEOUT 4 + /* PSCI version decoding (independent of PSCI version) */ #define PSCI_VERSION_MAJOR_SHIFT 16 #define PSCI_VERSION_MINOR_MASK \ @@ -133,5 +150,8 @@ #define PSCI_RET_NOT_PRESENT -7 #define PSCI_RET_DISABLED -8 #define PSCI_RET_INVALID_ADDRESS -9 +#define PSCI_RET_TIMEOUT -10 +#define PSCI_RET_RATE_LIMITED -11 +#define PSCI_RET_BUSY -12 #endif /* _UAPI_LINUX_PSCI_H */ From patchwork Mon Mar 18 16:14:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 13595578 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 82E3452F6E; Mon, 18 Mar 2024 16:47:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710780431; cv=none; b=QLc1tzeWk7Te+oAFwy9fbXlOJM+Ai78IIeJwBPx68EcN4ob7fhM6mijnwKRoGcd+EA+5QID97b97jAP33T7eZbHMDKoZziQt6WV3FJHpZ3HL4SzsyZzhCTc+kLzXSY4J4Y3LkrJ0l2CCJ32XjWWYZ5VL3ACOEMbvOhNIZYF4fdM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710780431; c=relaxed/simple; bh=xCMcoBeAn92mm429fRpBaeAv+JW9JgKJuf/H7YpvXUo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; 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bh=Xyw6pk7zn4iFLKziLAKf5sK11Uu17VrJE78dXX+5XEk=; b=Yfi4kdXFo5ww+yFo2Q7L746RO3 hXmuv4GJNX1gSMcu8d4JM2BIxo4Tv57TKIHP3sLhORGEVEpNrnRcgy6XJrWwv6e6B5mlMSB8d8ld8 oCJL5M45rPGtGqABzd69bZzMnl7ahUwZ88dbMbwNy5Ha94r6xqk2tJQjHA3dugoOAD3pLrlyxi4BC BpRugeUSo6NDW85TPieORghou9/cVyJOW8H6tQi3U2ciyMrQKWqgIbaWmlaB/8ozEqMXH8ojBtrw6 Xm9ffYFVCQHJ9yJ7TVWayK59u4IqEmUvtQRjxjnYIo8oqMNF4yE78m7CqlGjxFK38aN1qm4IWagVi 4UM2cRBQ==; Received: from [2001:8b0:10b:1::ebe] (helo=i7.infradead.org) by desiato.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1rmG8Z-0000000CjyB-1jje; Mon, 18 Mar 2024 16:46:59 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1rmG8W-00000004F1G-16xY; Mon, 18 Mar 2024 16:46:56 +0000 From: David Woodhouse To: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Paolo Bonzini , Jonathan Corbet , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Mark Rutland , Lorenzo Pieralisi , "Rafael J. Wysocki" , Len Brown , Pavel Machek , David Woodhouse , Mostafa Saleh , Jean-Philippe Brucker , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-pm@vger.kernel.org Subject: [RFC PATCH v2 2/4] KVM: arm64: Add PSCI SYSTEM_OFF2 function for hibernation Date: Mon, 18 Mar 2024 16:14:24 +0000 Message-ID: <20240318164646.1010092-3-dwmw2@infradead.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240318164646.1010092-1-dwmw2@infradead.org> References: <20240318164646.1010092-1-dwmw2@infradead.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html From: David Woodhouse The PSCI v1.3 specification (alpha) adds support for a SYSTEM_OFF2 function which is analogous to ACPI S4 state. This will allow hosting environments to determine that a guest is hibernated rather than just powered off, and ensure that they preserve the virtual environment appropriately to allow the guest to resume safely (or bump the hardware_signature in the FACS to trigger a clean reboot instead). The beta version will be changed to say that PSCI_FEATURES returns a bit mask of the supported hibernate types, which is implemented here. Signed-off-by: David Woodhouse --- Documentation/virt/kvm/api.rst | 11 +++++++++ arch/arm64/include/asm/kvm_host.h | 2 ++ arch/arm64/include/uapi/asm/kvm.h | 6 +++++ arch/arm64/kvm/arm.c | 5 +++++ arch/arm64/kvm/psci.c | 37 +++++++++++++++++++++++++++++++ include/uapi/linux/kvm.h | 1 + 6 files changed, 62 insertions(+) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 0b5a33ee71ee..ff061b6a2393 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -6761,6 +6761,10 @@ the first `ndata` items (possibly zero) of the data array are valid. the guest issued a SYSTEM_RESET2 call according to v1.1 of the PSCI specification. + - for arm64, data[0] is set to KVM_SYSTEM_EVENT_SHUTDOWN_FLAG_PSCI_OFF2 + if the guest issued a SYSTEM_OFF2 call according to v1.3 of the PSCI + specification. + - for RISC-V, data[0] is set to the value of the second argument of the ``sbi_system_reset`` call. @@ -6794,6 +6798,13 @@ either: - Deny the guest request to suspend the VM. See ARM DEN0022D.b 5.19.2 "Caller responsibilities" for possible return values. +Hibernation using the PSCI SYSTEM_OFF2 call is enabled with the +KVM_CAP_ARM_SYSTEM_OFF2 VM capability. If a guest invokes the PSCI +SYSTEM_OFF2 function, KVM will exit to userspace with the +KVM_SYSTEM_EVENT_SHUTDOWN event type and with data[0] set to +KVM_SYSTEM_EVENT_SHUTDOWN_FLAG_PSCI_OFF2. The only supported hibernate +type for the SYSTEM_OFF2 function is HIBERNATE_OFF (0x0). + :: /* KVM_EXIT_IOAPIC_EOI */ diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 6883963bbc3a..6ed05791afdb 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -299,6 +299,8 @@ struct kvm_arch { #define KVM_ARCH_FLAG_ID_REGS_INITIALIZED 7 /* Fine-Grained UNDEF initialised */ #define KVM_ARCH_FLAG_FGU_INITIALIZED 8 + /* PSCI SYSTEM_OFF2 (hibernate) enabled for the guest */ +#define KVM_ARCH_FLAG_SYSTEM_OFF2_ENABLED 9 unsigned long flags; /* VM-wide vCPU feature set */ diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 964df31da975..66736ff04011 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -484,6 +484,12 @@ enum { */ #define KVM_SYSTEM_EVENT_RESET_FLAG_PSCI_RESET2 (1ULL << 0) +/* + * Shutdown caused by a PSCI v1.3 SYSTEM_OFF2 call. + * Valid only when the system event has a type of KVM_SYSTEM_EVENT_SHUTDOWN. + */ +#define KVM_SYSTEM_EVENT_SHUTDOWN_FLAG_PSCI_OFF2 (1ULL << 0) + /* run->fail_entry.hardware_entry_failure_reason codes. */ #define KVM_EXIT_FAIL_ENTRY_CPU_UNSUPPORTED (1ULL << 0) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 3dee5490eea9..47d23064d6f7 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -98,6 +98,10 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm, r = 0; set_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags); break; + case KVM_CAP_ARM_SYSTEM_OFF2: + r = 0; + set_bit(KVM_ARCH_FLAG_SYSTEM_OFF2_ENABLED, &kvm->arch.flags); + break; case KVM_CAP_ARM_EAGER_SPLIT_CHUNK_SIZE: new_cap = cap->args[0]; @@ -243,6 +247,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_VCPU_ATTRIBUTES: case KVM_CAP_PTP_KVM: case KVM_CAP_ARM_SYSTEM_SUSPEND: + case KVM_CAP_ARM_SYSTEM_OFF2: case KVM_CAP_IRQFD_RESAMPLE: case KVM_CAP_COUNTER_OFFSET: r = 1; diff --git a/arch/arm64/kvm/psci.c b/arch/arm64/kvm/psci.c index 1f69b667332b..59570eea8aa7 100644 --- a/arch/arm64/kvm/psci.c +++ b/arch/arm64/kvm/psci.c @@ -194,6 +194,12 @@ static void kvm_psci_system_off(struct kvm_vcpu *vcpu) kvm_prepare_system_event(vcpu, KVM_SYSTEM_EVENT_SHUTDOWN, 0); } +static void kvm_psci_system_off2(struct kvm_vcpu *vcpu) +{ + kvm_prepare_system_event(vcpu, KVM_SYSTEM_EVENT_SHUTDOWN, + KVM_SYSTEM_EVENT_SHUTDOWN_FLAG_PSCI_OFF2); +} + static void kvm_psci_system_reset(struct kvm_vcpu *vcpu) { kvm_prepare_system_event(vcpu, KVM_SYSTEM_EVENT_RESET, 0); @@ -353,6 +359,11 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor) if (test_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags)) val = 0; break; + case PSCI_1_3_FN_SYSTEM_OFF2: + case PSCI_1_3_FN64_SYSTEM_OFF2: + if (test_bit(KVM_ARCH_FLAG_SYSTEM_OFF2_ENABLED, &kvm->arch.flags)) + val = 1UL << PSCI_1_3_HIBERNATE_TYPE_OFF; + break; case PSCI_1_1_FN_SYSTEM_RESET2: case PSCI_1_1_FN64_SYSTEM_RESET2: if (minor >= 1) @@ -374,6 +385,32 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor) return 0; } break; + case PSCI_1_3_FN_SYSTEM_OFF2: + kvm_psci_narrow_to_32bit(vcpu); + fallthrough; + case PSCI_1_3_FN64_SYSTEM_OFF2: + if (!test_bit(KVM_ARCH_FLAG_SYSTEM_OFF2_ENABLED, &kvm->arch.flags)) + break; + + arg = smccc_get_arg1(vcpu); + if (arg != PSCI_1_3_HIBERNATE_TYPE_OFF) { + val = PSCI_RET_INVALID_PARAMS; + break; + } + kvm_psci_system_off2(vcpu); + /* + * We shouldn't be going back to guest VCPU after + * receiving SYSTEM_OFF2 request. + * + * If user space accidentally/deliberately resumes + * guest VCPU after SYSTEM_OFF request then guest + * VCPU should see internal failure from PSCI return + * value. To achieve this, we preload r0 (or x0) with + * PSCI return value INTERNAL_FAILURE. + */ + val = PSCI_RET_INTERNAL_FAILURE; + ret = 0; + break; case PSCI_1_1_FN_SYSTEM_RESET2: kvm_psci_narrow_to_32bit(vcpu); fallthrough; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 2190adbe3002..caa3845b80d6 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -917,6 +917,7 @@ struct kvm_enable_cap { #define KVM_CAP_MEMORY_ATTRIBUTES 233 #define KVM_CAP_GUEST_MEMFD 234 #define KVM_CAP_VM_TYPES 235 +#define KVM_CAP_ARM_SYSTEM_OFF2 236 struct kvm_irq_routing_irqchip { __u32 irqchip; From patchwork Mon Mar 18 16:14:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 13595577 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 A5A1C54BC4; Mon, 18 Mar 2024 16:47:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710780431; cv=none; b=ZVZHkI8n2rmVrm/cumVZGC3FfSl15wzVSM6aS1wRWQ9fDaGqQCe3i+Fvvmsjz8uo78MqBXhMZf0cVRMLN9aFNM1gMaKqFCn36qNsaAgjckokg8b03B2cB+qHA9jJ11ztuwBh+oO2xs4ieQbO8tT/Xo8fTxicXxUkG89XD+iFKQc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710780431; c=relaxed/simple; bh=JVi4X3Yp8llR/EjNT7yP76NQ5cLtcJoGUEbvuYaKKYU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DKbXfbOlaQlGVrmK3bgWIhRVXnBk00FrV1iG2Lm9qWVMvMvMgsfmsSHb3c+pGWAgR95lHslvWXEu/j7sBuRCzI6TU8oO/tYdEr8RQzxH7GnpsoqxQWZLfmkNxCXQ6qOBBhZK43OkWw7WlqbZ9Z2WUyjbL/6oUohdb9tG0FAwNzo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=ipCVPLOO; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ipCVPLOO" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=4Zpz2JcjWhGlazAgpId/FsjMBJt7sqHYOH/Rw/CmRqw=; b=ipCVPLOOed/JkOQ7fF2XxmRcmK 4Wru5XuYC6dRfKrzA1pgKjldfZ4KZBEoIcQcPPPhnTwH199fTLRQJy1vHvS8sCR5f9ENR6BhRkwTz wm1235unu71rA+0gWC8ckQiMGHzaIqzp3aCZ0SUPzrCQvo7r5dgm3qV285R6KiuqIK9gWFYIlwpFn sylBy6nqwmvlo5jLaPbtHTe2OubULNEfzeaAtKhxSoldoqhmtissBea2kO2HS7h8NtHiTLb+HskTT /kB+Uu9GckQ6m58bDpfjOtWOXIb/ObhLLMU/xSyf8n9aoFD0rS56j15E3x1Yzyr8xO6iqUSvsDfUi lhslC9Qg==; Received: from [2001:8b0:10b:1::ebe] (helo=i7.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1rmG8Y-0000000HYwj-0erY; Mon, 18 Mar 2024 16:47:02 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1rmG8W-00000004F1K-1QMs; Mon, 18 Mar 2024 16:46:56 +0000 From: David Woodhouse To: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Paolo Bonzini , Jonathan Corbet , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Mark Rutland , Lorenzo Pieralisi , "Rafael J. Wysocki" , Len Brown , Pavel Machek , David Woodhouse , Mostafa Saleh , Jean-Philippe Brucker , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-pm@vger.kernel.org Subject: [RFC PATCH v2 3/4] KVM: arm64: nvhe: Pass through PSCI v1.3 SYSTEM_OFF2 call Date: Mon, 18 Mar 2024 16:14:25 +0000 Message-ID: <20240318164646.1010092-4-dwmw2@infradead.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240318164646.1010092-1-dwmw2@infradead.org> References: <20240318164646.1010092-1-dwmw2@infradead.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html From: David Woodhouse Pass through the SYSTEM_OFF2 function for hibernation, just like SYSTEM_OFF. Signed-off-by: David Woodhouse --- arch/arm64/kvm/hyp/nvhe/psci-relay.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/psci-relay.c b/arch/arm64/kvm/hyp/nvhe/psci-relay.c index d57bcb6ab94d..76c7643e7eff 100644 --- a/arch/arm64/kvm/hyp/nvhe/psci-relay.c +++ b/arch/arm64/kvm/hyp/nvhe/psci-relay.c @@ -265,6 +265,8 @@ static unsigned long psci_1_0_handler(u64 func_id, struct kvm_cpu_context *host_ case PSCI_1_0_FN_PSCI_FEATURES: case PSCI_1_0_FN_SET_SUSPEND_MODE: case PSCI_1_1_FN64_SYSTEM_RESET2: + case PSCI_1_3_FN_SYSTEM_OFF2: + case PSCI_1_3_FN64_SYSTEM_OFF2: return psci_forward(host_ctxt); case PSCI_1_0_FN64_SYSTEM_SUSPEND: return psci_system_suspend(func_id, host_ctxt); From patchwork Mon Mar 18 16:14:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 13595579 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 A59EA5339C; Mon, 18 Mar 2024 16:47:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710780431; cv=none; b=rxZqMUgzet0zroRR7Kt+yNL0NXIjGFuQRSMa5nw2OGLqiFH0MpAsnxKNdQL5wP2F3KfJrbz7e8aiRk6zgXZbP7VLVuOqPsxDgb/cqYwAIRDmwTFMFuQszi+Lj/vcmyZIfE7aAMaNdANzqotSzpayt+J9NGeqvIMiN/uFA+Abt/k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710780431; c=relaxed/simple; bh=HMH0aJ/yhL4TtEL6UtwH+nkbeX43Qv6MTp6+ytOSTDE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=H72RgHjhNjWrTja8Ry0BqtKunnYvZkginL8oltbT1MARuYkgtQEUOI/zq6P9RTSGlzeCM38UvpZsbaDcRKmqqTSbImjoSm4l7tynYHdTGzGoUDa/44ir27ZVrb5gg+w25seGoyWaYtpppwQYUrE+89csPik9pjVuX6bmMtPYeRo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=ipGwZ57E; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ipGwZ57E" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=Pmgtt4mh52E0ERFpZQ40Zoz9sGIFhtqH6Ihl0RxJeMs=; b=ipGwZ57EX1Q/KSpJv+f0OXBCYd Hy6VePBB4Z9X44cgQUQ9V/aiL1NDW8dxU8mcQwywTlYJJk1wtnER13dL6xntj1XxzqtJjj3/g0Ifv /xERVlby30wfTGNAxaxgnTJ1OdZJzhVtepQhfBFUF+ZwLlkK+T13uO89gxqrPrNtwoJb5hESt/urx Rja8GYe8ou2L6pC6NLpk4wgLl4uQ9iqqZhed/muJcgJGerciUQlXcevKPop3A8LILP3cb03FkbVki OY7ymrYZNQf8yxVfgO/PE2ChvLLBEzsHKuDsuJ7UECQI70yDTlHBob7AwE0ANlZGPKPlTcxFL5sJQ d1Si48uA==; Received: from [2001:8b0:10b:1::ebe] (helo=i7.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1rmG8Y-0000000HYwi-0fKy; Mon, 18 Mar 2024 16:47:02 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1rmG8W-00000004F1N-1eQn; Mon, 18 Mar 2024 16:46:56 +0000 From: David Woodhouse To: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Paolo Bonzini , Jonathan Corbet , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Mark Rutland , Lorenzo Pieralisi , "Rafael J. Wysocki" , Len Brown , Pavel Machek , David Woodhouse , Mostafa Saleh , Jean-Philippe Brucker , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-pm@vger.kernel.org Subject: [RFC PATCH v2 4/4] arm64: Use SYSTEM_OFF2 PSCI call to power off for hibernate Date: Mon, 18 Mar 2024 16:14:26 +0000 Message-ID: <20240318164646.1010092-5-dwmw2@infradead.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240318164646.1010092-1-dwmw2@infradead.org> References: <20240318164646.1010092-1-dwmw2@infradead.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html From: David Woodhouse The PSCI v1.3 specification (alpha) adds support for a SYSTEM_OFF2 function which is analogous to ACPI S4 state. This will allow hosting environments to determine that a guest is hibernated rather than just powered off, and handle that state appropriately on subsequent launches. Since commit 60c0d45a7f7a ("efi/arm64: use UEFI for system reset and poweroff") the EFI shutdown method is deliberately preferred over PSCI or other methods. So register a SYS_OFF_MODE_POWER_OFF handler which *only* handles the hibernation, leaving the original PSCI SYSTEM_OFF as a last resort via the legacy pm_power_off function pointer. The hibernation code already exports a system_entering_hibernation() function which is be used by the higher-priority handler to check for hibernation. That existing function just returns the value of a static boolean variable from hibernate.c, which was previously only set in the hibernation_platform_enter() code path. Set the same flag in the simpler code path around the call to kernel_power_off() too. An alternative way to hook SYSTEM_OFF2 into the hibernation code would be to register a platform_hibernation_ops structure with an ->enter() method which makes the new SYSTEM_OFF2 call. But that would have the unwanted side-effect of making hibernation take a completely different code path in hibernation_platform_enter(), invoking a lot of special dpm callbacks. Another option might be to add a new SYS_OFF_MODE_HIBERNATE mode, with fallback to SYS_OFF_MODE_POWER_OFF. Or to use the sys_off_data to indicate whether the power off is for hibernation. But this version works and is relatively simple. Signed-off-by: David Woodhouse --- drivers/firmware/psci/psci.c | 35 +++++++++++++++++++++++++++++++++++ kernel/power/hibernate.c | 5 ++++- 2 files changed, 39 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c index d9629ff87861..69d2f6969438 100644 --- a/drivers/firmware/psci/psci.c +++ b/drivers/firmware/psci/psci.c @@ -78,6 +78,7 @@ struct psci_0_1_function_ids get_psci_0_1_function_ids(void) static u32 psci_cpu_suspend_feature; static bool psci_system_reset2_supported; +static bool psci_system_off2_supported; static inline bool psci_has_ext_power_state(void) { @@ -333,6 +334,28 @@ static void psci_sys_poweroff(void) invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); } +#ifdef CONFIG_HIBERNATION +static int psci_sys_hibernate(struct sys_off_data *data) +{ + if (system_entering_hibernation()) + invoke_psci_fn(PSCI_FN_NATIVE(1_3, SYSTEM_OFF2), + PSCI_1_3_HIBERNATE_TYPE_OFF, 0, 0); + return NOTIFY_DONE; +} + +static int __init psci_hibernate_init(void) +{ + if (psci_system_off2_supported) { + /* Higher priority than EFI shutdown, but only for hibernate */ + register_sys_off_handler(SYS_OFF_MODE_POWER_OFF, + SYS_OFF_PRIO_FIRMWARE + 2, + psci_sys_hibernate, NULL); + } + return 0; +} +subsys_initcall(psci_hibernate_init); +#endif + static int psci_features(u32 psci_func_id) { return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES, @@ -364,6 +387,7 @@ static const struct { PSCI_ID_NATIVE(1_1, SYSTEM_RESET2), PSCI_ID(1_1, MEM_PROTECT), PSCI_ID_NATIVE(1_1, MEM_PROTECT_CHECK_RANGE), + PSCI_ID_NATIVE(1_3, SYSTEM_OFF2), }; static int psci_debugfs_read(struct seq_file *s, void *data) @@ -523,6 +547,16 @@ static void __init psci_init_system_reset2(void) psci_system_reset2_supported = true; } +static void __init psci_init_system_off2(void) +{ + int ret; + + ret = psci_features(PSCI_FN_NATIVE(1_3, SYSTEM_OFF2)); + + if (ret != PSCI_RET_NOT_SUPPORTED) + psci_system_off2_supported = true; +} + static void __init psci_init_system_suspend(void) { int ret; @@ -653,6 +687,7 @@ static int __init psci_probe(void) psci_init_cpu_suspend(); psci_init_system_suspend(); psci_init_system_reset2(); + psci_init_system_off2(); kvm_init_hyp_services(); } diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index 4b0b7cf2e019..ac87b3cb670c 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -676,8 +676,11 @@ static void power_down(void) } fallthrough; case HIBERNATION_SHUTDOWN: - if (kernel_can_power_off()) + if (kernel_can_power_off()) { + entering_platform_hibernation = true; kernel_power_off(); + entering_platform_hibernation = false; + } break; } kernel_halt();