From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id ACCD841A4E7; Mon, 3 Aug 2026 13:46:47 +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=1785764809; cv=none; b=uThud77Fu8D2NPggH0WzX4a/jlSR9iob5+pq0zAhae4z8V8uLZ5AMKAPmj7gcA9C5RkICcxl5n9mDqUuGB5y647JSjvy741r/erzXnfY+OKzJisgkW9WRBEyvksDkNO+H4loSFe86cR+dxPaJBZEqTkCHyzBwbmw03gFfrLQwMg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785764809; c=relaxed/simple; bh=rE5FH9m6cgbxv4oXJ1XSPENbjK143njy6sCuV+SL+fo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=S2nqoy++/pqkO//rJf4WtcA0B88ffMRd263qsQTSgMKKMfXP314xbF1nJOvbQKNWosIPXDey0iSKWXtcD3X918w+gh1H6BLrVsrKnP2jVDbp/qqFU245u5Jt6J8EZA2CDfhFg3KEMIq/iBImKWl4XnI+iPAh8ccpfJ5bI/OBRTc= 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; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=ckVzX19e; 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 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="ckVzX19e" 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 F0C2F1476; Mon, 3 Aug 2026 06:46:42 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.25.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BBB873F66F; Mon, 3 Aug 2026 06:46:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1785764807; bh=rE5FH9m6cgbxv4oXJ1XSPENbjK143njy6sCuV+SL+fo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ckVzX19es7E2Ac9HZIzWyIGBb0UzHKb0HeLvoqyl/wXBsBzXU7/zUXzLh4mmsAvX4 Wm246oY5mYIzCBXgMKG4ozQJ5tKXpAHRkweVj+5xPjNI/WM94dTBtrdz7+yvWPt5v8 PyzLiCgxjHUyFZW2jNGDGl+CiSG8LmHDkA3EOOhQ= 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" , Emi Kisanuki , Vishal Annapurve , WeiLin.Chang@arm.com, Lorenzo Pieralisi Subject: [PATCH v16 32/45] KVM: arm64: CCA: Handle Realm PSCI requests Date: Mon, 3 Aug 2026 14:43:48 +0100 Message-ID: <20260803134403.80630-33-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260803134403.80630-1-steven.price@arm.com> References: <20260803134403.80630-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Some PSCI commands cause a REC exit and the host has to call RMI_PSCI_COMPLETE to provide the status value to return to the guest. Co-developed-by: Suzuki K Poulose Signed-off-by: Suzuki K Poulose Signed-off-by: Steven Price --- Changes since v15: * Adapt to new exit handling. Changes since v14: * Dropped the support for providing the target REC for a PSCI call (as per v2.0-bet2 spec). Changes since v13: * The ioctl KVM_ARM_VCPU_RMI_PSCI_COMPLETE has gone. The RMI call is made automatically just before entering the REC again. Changes since v12: * Change return code for non-realms to -ENXIO to better represent that the ioctl is invalid for non-realms (checkpatch is insistent that "ENOSYS means 'invalid syscall nr' and nothing else"). Changes since v11: * RMM->RMI renaming. Changes since v6: * Use vcpu_is_rec() rather than kvm_is_realm(vcpu->kvm). * Minor renaming/formatting fixes. --- arch/arm64/include/asm/kvm_rmi.h | 2 ++ arch/arm64/kvm/rmi.c | 38 ++++++++++++++++++++++++++++++++ 2 files changed, 40 insertions(+) diff --git a/arch/arm64/include/asm/kvm_rmi.h b/arch/arm64/include/asm/kvm_rmi.h index 967c0a6e8e9c..0fb685004d5c 100644 --- a/arch/arm64/include/asm/kvm_rmi.h +++ b/arch/arm64/include/asm/kvm_rmi.h @@ -123,6 +123,8 @@ int realm_map_ipa(struct kvm *kvm, phys_addr_t ipa, enum kvm_pgtable_prot prot, struct kvm_mmu_memory_cache *memcache); +int realm_psci_complete(struct kvm_vcpu *source, unsigned long status); + static inline bool kvm_realm_is_private_address(struct realm *realm, unsigned long addr) { diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c index 3ef185bc8210..3f31ad25680f 100644 --- a/arch/arm64/kvm/rmi.c +++ b/arch/arm64/kvm/rmi.c @@ -3,6 +3,7 @@ * Copyright (C) 2023-2026 ARM Ltd. */ +#include #include #include @@ -120,6 +121,17 @@ static void free_rtt(phys_addr_t phys) kvm_account_pgtable_pages(phys_to_virt(phys), -1); } +int realm_psci_complete(struct kvm_vcpu *source, unsigned long status) +{ + long ret; + + ret = rmi_psci_complete(source->arch.rec.rec_phys, status); + if (ret) + return -ENXIO; + + return 0; +} + static long realm_rtt_create(struct realm *realm, unsigned long addr, int level, @@ -1145,6 +1157,30 @@ static int kvm_complete_ripas_change(struct kvm_vcpu *vcpu) return 1; } +static int kvm_rec_complete_psci(struct kvm_vcpu *vcpu) +{ + struct rec_run *run = vcpu->arch.rec.run; + unsigned long status = PSCI_RET_DENIED; + unsigned long ret = vcpu_get_reg(vcpu, 0); + int r; + + switch (run->exit.gprs[0]) { + case PSCI_0_2_FN64_CPU_ON: { + if (ret != PSCI_RET_SUCCESS && + ret != PSCI_RET_ALREADY_ON) + status = PSCI_RET_DENIED; + else + status = PSCI_RET_SUCCESS; + break; + } + default: + return 1; + } + + r = realm_psci_complete(vcpu, status); + return r ?: 1; +} + int kvm_rec_handle_request(struct kvm_vcpu *vcpu) { struct realm_rec *rec = &vcpu->arch.rec; @@ -1163,6 +1199,8 @@ int kvm_rec_handle_request(struct kvm_vcpu *vcpu) vcpu_get_reg(vcpu, rt); } break; + case RMI_EXIT_PSCI: + return kvm_rec_complete_psci(vcpu); case RMI_EXIT_RIPAS_CHANGE: return kvm_complete_ripas_change(vcpu); default: -- 2.43.0