| Message ID | 20240610134202.54893-27-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 2115913D278; Mon, 10 Jun 2024 13:43:45 +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=1718027026; cv=none; b=hQasuSfRQMQz3WO72RcEPofptYSO1u4YJ7piRZCW3PxemtN+zkHFMUsx3e7WsT3KvTcqe1fxqaaTHe4NILrE0857PmaoAqBmstuhHlXG95eNnZ2TJkZHRG8w0m4aLy7cMmulBXYx3BLf6qLXGaLOm2P0BhCKk7beullWUWZQ/Tk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718027026; c=relaxed/simple; bh=2iu8E7+wuj6oKBgbTmuHms6htCryC5gxsoYCxceLMoo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=d7Ef3o6b9zBH/6MuQZrhOPnLbfD7dXYGRIa44CKGdyUWCcKdKEa94JoBmWZoRF2X3+okiYgLm2cOYt9pY2CNFCTcOVJ1ZoQItFGG20zFegZMtsD48MmsU4G30o+qCSMytVS9mJz4EizuSBRB7ZKsIrINmm8TIydPlK0iZ9bqsf0= 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 5185B12FC; Mon, 10 Jun 2024 06:44:09 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.35.41]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 0A5FE3F58B; Mon, 10 Jun 2024 06:43:40 -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> Subject: [PATCH v3 26/43] arm64: Don't expose stolen time for realm guests Date: Mon, 10 Jun 2024 14:41:45 +0100 Message-Id: <20240610134202.54893-27-steven.price@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240610134202.54893-1-steven.price@arm.com> References: <20240610134202.54893-1-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
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expand
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diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 77ea231cfb04..f78e92dfaa72 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -418,7 +418,10 @@ 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 && 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 and with the ABI as it is it's a footgun for the VMM which makes fatal granule protection faults easy to trigger. Signed-off-by: Steven Price <steven.price@arm.com> --- arch/arm64/kvm/arm.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)