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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2e5a5ecf461sm15865645ad.53.2026.10.05.20.18.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 05 Oct 2026 20:18:51 -0700 (PDT) Message-ID: Date: Tue, 6 Oct 2026 13:18:42 +1000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v22 17/23] KVM: arm64: CCA: Add bare minimal S2 operations for Realm 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 References: <20261005090754.2140522-1-suzuki.poulose@arm.com> <20261005090754.2140522-18-suzuki.poulose@arm.com> From: Gavin Shan In-Reply-To: <20261005090754.2140522-18-suzuki.poulose@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: SJ1XKW2R5uiBZAKOGZRr96gR3mx-Qm0AxYMxgnC-C2g_1791256733 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261005_201859_183343_BDC13A31 X-CRM114-Status: GOOD ( 13.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 10/5/26 7:07 PM, Suzuki K Poulose wrote: > Add bare minimal MMU operation hooks for Realms. The mem_abort handling > is chosen as the default KVM variant. However this cannot be reached for > Realms yet and we would need real RMI command support to make it fully > functional. Similarly, unmapping stage2 requires RMI command support. > Until then reuse follow protected pKVM hook and ignore unmapping. > This will be addressed in the later series. > > RMM takes care of the TLB flushing as required, when the Stage2 is > modified. So host doesn't need to do anything explicitly. RMM doesn't > support access flags for the stage2, even for the shared IPA. > > Signed-off-by: Suzuki K Poulose > --- > Changes since v21: > - Reuse no_age_gfn for Realms. Also use no_stage2_unmap_range for > now, until we get proper RMI backed driver. > --- > arch/arm64/kvm/mmu.c | 23 +++++++++++++++++++++++ > 1 file changed, 23 insertions(+) > Reviewed-by: Gavin Shan