| Message ID | 20240821153844.60084-27-steven.price@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show
Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 6433D1C2DCD; Wed, 21 Aug 2024 15:40:41 +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=1724254842; cv=none; b=MsmVpd4eYp4LXqrNTtWm9fxAVDg7yGEQt4tq0XYPaOrkyTCn1AGxLzv3d02jlrSPqZbRtBNMkXvF+3OvAoVU4JKSrY36EH3/1sCzLsKcPVoySWoHR52j58OJ8WItEjti40ElbMfKdk7TGNomHxmc8hslNRjh56tRzbFch8BXfL0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724254842; c=relaxed/simple; bh=7qzxI8Qlc0Z2RLMTqv9MTzVqfg4jitNEiOqnBGTUYNI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=sJWyo077TXp7iTFS/C0LR/3dkeRC8r1xVywBBwTwOjiOnIwfxdULSMh8mqYEdDtv4RMHdFuv36OOcvu8i4PrT7GUNJ1QHTuMx/QM6+wF0Y6F2WV2QTUmLT6vYVPuTJP7RSzMmgU4b8sGuo+O+SK2JIjo6pL1gy22feAde7Ct+ng= 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 222D9152B; Wed, 21 Aug 2024 08:41:07 -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 065403F73B; Wed, 21 Aug 2024 08:40:37 -0700 (PDT) From: Steven Price <steven.price@arm.com> To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price <steven.price@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>, James Morse <james.morse@arm.com>, Oliver Upton <oliver.upton@linux.dev>, Suzuki K Poulose <suzuki.poulose@arm.com>, Zenghui Yu <yuzenghui@huawei.com>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly <joey.gouly@arm.com>, Alexandru Elisei <alexandru.elisei@arm.com>, Christoffer Dall <christoffer.dall@arm.com>, Fuad Tabba <tabba@google.com>, linux-coco@lists.linux.dev, Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>, Gavin Shan <gshan@redhat.com>, Shanker Donthineni <sdonthineni@nvidia.com>, Alper Gun <alpergun@google.com> Subject: [PATCH v4 26/43] arm64: Don't expose stolen time for realm guests Date: Wed, 21 Aug 2024 16:38:27 +0100 Message-Id: <20240821153844.60084-27-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: <kvm.vger.kernel.org> List-Subscribe: <mailto:kvm+subscribe@vger.kernel.org> List-Unsubscribe: <mailto:kvm+unsubscribe@vger.kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit |
| Series |
arm64: Support for Arm CCA in KVM
|
expand
|
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index c57ed4f41bbc..2d7cbd4a2483 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -429,7 +429,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = system_supports_mte(); break; case KVM_CAP_STEAL_TIME: - r = kvm_arm_pvtime_supported(); + if (kvm_is_realm(kvm)) + r = 0; + else + r = kvm_arm_pvtime_supported(); break; case KVM_CAP_ARM_EL1_32BIT: r = cpus_have_final_cap(ARM64_HAS_32BIT_EL1);
It doesn't make much sense as a realm guest wouldn't want to trust the host. It will also need some extra work to ensure that KVM will only attempt to write into a shared memory region. So for now just disable it. Signed-off-by: Steven Price <steven.price@arm.com> --- arch/arm64/kvm/arm.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)