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 C312740EBB2; Wed, 15 Jul 2026 14:30:28 +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=1784125830; cv=none; b=GVZi355r1ZH5CjpU8G80sf3m4pesHx1vtHYEUIDi0F7lkrl9CFERjz7gLSrBnGtXHja3k1Xzn6ku577LCx36KlxKUQy5PCEoHvZv5iAVVVTStxw5LVEqUqPiukbJsU+8K684EZgs9S4B7XQL4kGLFfpYknhafqSKtSrOF2gSRV4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784125830; c=relaxed/simple; bh=LrO5HmU/ibLzJRg9BZGCtuLiyBzz5qn2yu+Rs6vdwr0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sS4NQ1NJST57WKWw9jfU5ZZPauhhvqzFynYWa8iQulE6Abwvo65XMoLJ7h43icNsFMCc7+50N7ChcTZDBTRCvQk8fMy+kjZU9t35or/kWqBl3zHtSzlFGnpt7ZwkL9oSnr0+T+dIX1JfOlhGNbO5YCceJUMSNshv0VYMghgFakU= 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=NgKFafBp; 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="NgKFafBp" 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 72F14153B; Wed, 15 Jul 2026 07:30:23 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.25.27]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2BAA13F93E; Wed, 15 Jul 2026 07:30:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1784125827; bh=LrO5HmU/ibLzJRg9BZGCtuLiyBzz5qn2yu+Rs6vdwr0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NgKFafBpcNrozMkY3ZI3/MZOZv9KSw3iCP9c41LG+bwRNeaAbG51H2DB03FRw2JGC xIuEQSWuyIM/P3d9N0EYNrn7jHu6Zjo5aNYzXvK5W3vFaprTARBttRJ1ofUvPV4rtm 7ffTpuO8lsRacLCbKDyyrE7IqbLKtmrXu82CFIgw= 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 v15 19/37] KVM: arm64: CCA: Activate realms on first vCPU run Date: Wed, 15 Jul 2026 15:28:21 +0100 Message-ID: <20260715142841.80544-20-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260715142841.80544-1-steven.price@arm.com> References: <20260715142841.80544-1-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 Use kvm_arch_vcpu_run_pid_change() to check if this is the first time the realm guest has run. If this is the first run then activate the realm. Signed-off-by: Steven Price --- Changes since v12: * Fix commit message * Change realm_state checks to be >= REALM_STATE_ACTIVE to avoid a dead guest being revived by kvm_activate_realm(). --- arch/arm64/include/asm/kvm_rmi.h | 1 + arch/arm64/kvm/arm.c | 6 +++++ arch/arm64/kvm/rmi.c | 45 ++++++++++++++++++++++++++++++-- 3 files changed, 50 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/kvm_rmi.h b/arch/arm64/include/asm/kvm_rmi.h index 5461c49bea4d..5cb99c187202 100644 --- a/arch/arm64/include/asm/kvm_rmi.h +++ b/arch/arm64/include/asm/kvm_rmi.h @@ -96,6 +96,7 @@ void kvm_init_rmi(void); u32 kvm_rmm_ipa_limit(void); int kvm_init_realm(struct kvm *kvm); +int kvm_activate_realm(struct kvm *kvm); void kvm_destroy_realm(struct kvm *kvm); int kvm_realm_teardown_stage2(struct kvm *kvm); void kvm_destroy_rec(struct kvm_vcpu *vcpu); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 534d33b7c67a..df33322b8fea 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1034,6 +1034,12 @@ int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu) return ret; } + if (kvm_is_realm(vcpu->kvm)) { + ret = kvm_activate_realm(kvm); + if (ret) + return ret; + } + mutex_lock(&kvm->arch.config_lock); set_bit(KVM_ARCH_FLAG_HAS_RAN_ONCE, &kvm->arch.flags); mutex_unlock(&kvm->arch.config_lock); diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c index 94776a9262c9..53b5b18f2275 100644 --- a/arch/arm64/kvm/rmi.c +++ b/arch/arm64/kvm/rmi.c @@ -687,7 +687,7 @@ static int realm_set_ipa_state(struct kvm_vcpu *vcpu, return ret; } -static int __maybe_unused realm_ensure_created(struct kvm *kvm) +static int realm_ensure_created(struct kvm *kvm) { lockdep_assert_held(&kvm->arch.config_lock); @@ -793,7 +793,7 @@ int noinstr kvm_rec_enter(struct kvm_vcpu *vcpu) return ret; } -static int __maybe_unused kvm_create_rec(struct kvm_vcpu *vcpu) +static int kvm_create_rec(struct kvm_vcpu *vcpu) { struct user_pt_regs *vcpu_regs = vcpu_gp_regs(vcpu); unsigned long mpidr = kvm_vcpu_get_mpidr_aff(vcpu); @@ -893,6 +893,47 @@ void kvm_destroy_rec(struct kvm_vcpu *vcpu) rec->rec_page = NULL; } +int kvm_activate_realm(struct kvm *kvm) +{ + struct realm *realm = &kvm->arch.realm; + struct kvm_vcpu *vcpu; + unsigned long i; + int ret; + + if (kvm_realm_state(kvm) >= REALM_STATE_ACTIVE) + return 0; + + if (!irqchip_in_kernel(kvm)) { + /* Userspace irqchip not yet supported with realms */ + return -EOPNOTSUPP; + } + + guard(mutex)(&kvm->arch.config_lock); + /* Check again with the lock held */ + if (kvm_realm_state(kvm) >= REALM_STATE_ACTIVE) + return 0; + + ret = realm_ensure_created(kvm); + if (ret) + return ret; + + /* Mark state as dead in case we fail */ + kvm_set_realm_state(kvm, REALM_STATE_DEAD); + + kvm_for_each_vcpu(i, vcpu, kvm) { + ret = kvm_create_rec(vcpu); + if (ret) + return ret; + } + + ret = rmi_realm_activate(virt_to_phys(realm->rd)); + if (ret) + return -ENXIO; + + kvm_set_realm_state(kvm, REALM_STATE_ACTIVE); + return 0; +} + void kvm_destroy_realm(struct kvm *kvm) { struct realm *realm = &kvm->arch.realm; -- 2.43.0