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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3a8543b0c1fsm3110944a91.14.2026.10.05.20.10.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 05 Oct 2026 20:10:23 -0700 (PDT) Message-ID: <9f9575f0-be48-4dd0-ba1f-98d8dd39f10c@redhat.com> Date: Tue, 6 Oct 2026 13:10:13 +1000 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v22 14/23] KVM: arm64: Mandate VGIC v3 for pKVM VMs and Realms To: Suzuki K Poulose , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: maz@kernel.org, will@kernel.org, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, steven.price@arm.com, aneesh.kumar@kernel.org, oupton@kernel.org, joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com, linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com, sdonthineni@nvidia.com, alpergun@google.com, fj0570is@fujitsu.com, WeiLin.Chang@arm.com, lpieralisi@kernel.org, enju.kohei@fujitsu.com, sudeep.holla@arm.com, jonathan.cameron@oss.qualcomm.com, Fuad Tabba References: <20261005090754.2140522-1-suzuki.poulose@arm.com> <20261005090754.2140522-15-suzuki.poulose@arm.com> From: Gavin Shan In-Reply-To: <20261005090754.2140522-15-suzuki.poulose@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 7Fzwyn6t0KWG-BqBRs7-GZmUV4yO_pJudfNBHhpdSbM_1791256225 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/5/26 7:07 PM, Suzuki K Poulose wrote: > pKVM does not trust the host. Realm VMs follow a similar trust model, with > the Realm Management Monitor owning the protected state instead of the > host. Add a helper to identify VMs that run under a host-distrusting > hypervisor. > > Use this for blocking ioremap of vgic-v2 into stage2 and prevent creation > of VGIC other than v3. > > Reviewed-by: Jonathan Cameron > Reviewed-by: Fuad Tabba > Tested-by: Gavin Shan > Signed-off-by: Suzuki K Poulose > --- > arch/arm64/include/asm/kvm_host.h | 4 ++++ > arch/arm64/kvm/mmu.c | 2 +- > arch/arm64/kvm/vgic/vgic-init.c | 2 ++ > 3 files changed, 7 insertions(+), 1 deletion(-) > Reviewed-by: Gavin Shan