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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-359b2e0e1aasm16842789a91.15.2026.03.08.23.45.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 08 Mar 2026 23:45:41 -0700 (PDT) Message-ID: Date: Mon, 9 Mar 2026 16:45:24 +1000 Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 11/41] KVM: arm64: Force guest EL1 to use user-space's partid configuration To: Ben Horgan Cc: amitsinght@marvell.com, baisheng.gao@unisoc.com, baolin.wang@linux.alibaba.com, carl@os.amperecomputing.com, dave.martin@arm.com, david@kernel.org, dfustini@baylibre.com, fenghuay@nvidia.com, james.morse@arm.com, jonathan.cameron@huawei.com, kobak@nvidia.com, lcherian@marvell.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, peternewman@google.com, punit.agrawal@oss.qualcomm.com, quic_jiles@quicinc.com, reinette.chatre@intel.com, rohit.mathew@arm.com, scott@os.amperecomputing.com, sdonthineni@nvidia.com, tan.shaopeng@fujitsu.com, xhao@linux.alibaba.com, catalin.marinas@arm.com, will@kernel.org, corbet@lwn.net, maz@kernel.org, oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, kvmarm@lists.linux.dev, zengheng4@huawei.com, linux-doc@vger.kernel.org, Shaopeng Tan References: <20260224175720.2663924-1-ben.horgan@arm.com> <20260224175720.2663924-12-ben.horgan@arm.com> From: Gavin Shan In-Reply-To: <20260224175720.2663924-12-ben.horgan@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: PCb7RvTtMZiuo_yLT12ZwQBXbMZiacWzEK_hlTYk22A_1773038743 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/25/26 3:56 AM, Ben Horgan wrote: > From: James Morse > > While we trap the guest's attempts to read/write the MPAM control > registers, the hardware continues to use them. Guest-EL0 uses KVM's > user-space's configuration, as the value is left in the register, and > guest-EL1 uses either the host kernel's configuration, or in the case of > VHE, the UNKNOWN reset value of MPAM1_EL1. > > We want to force the guest-EL1 to use KVM's user-space's MPAM > configuration. On nVHE rely on MPAM0_EL1 and MPAM1_EL1 always being > programmed the same and on VHE copy MPAM0_EL1 into the guest's > MPAM1_EL1. There is no need to restore as this is out of context once TGE > is set. > > Tested-by: Gavin Shan > Tested-by: Shaopeng Tan > Tested-by: Peter Newman > Tested-by: Zeng Heng > Reviewed-by: Shaopeng Tan > Reviewed-by: Jonathan Cameron > Signed-off-by: James Morse > Signed-off-by: Ben Horgan > --- > Changes since rfc: > Drop the unneeded __mpam_guest_load() in nvhre and the MPAM1_EL1 save restore > Defer EL2 handling until next patch > > Changes since v2: > Use mask (Oliver) > > Changes since v4: > Explicitly set the mpam enable bit > --- > arch/arm64/kvm/hyp/vhe/sysreg-sr.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > Reviewed-by: Gavin Shan