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[2003:f6:af0e:1b00:fa6b:1469:8c8a:91c3]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-485958f1493sm32933395f8f.37.2026.09.09.07.42.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Sep 2026 07:42:02 -0700 (PDT) From: Sebastian Ott To: Peter Maydell , Eric Auger , Jonathan Cameron , Alireza Sanaee , Richard Henderson , Cornelia Huck , khushit.shah@nutanix.com Cc: qemu-arm@nongnu.org, qemu-devel@nongnu.org, Sebastian Ott Subject: [PATCH v5 3/3] arm/kvm: get demuxed ID registers from kvm Date: Wed, 9 Sep 2026 16:41:51 +0200 Message-ID: <20260909144151.26803-4-sebott@redhat.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260909144151.26803-1-sebott@redhat.com> References: <20260909144151.26803-1-sebott@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: SEDseP2qwCm_5ZC9HaxDK1KVdGW1xN6vhNXzy0HVJ6I_1788964924 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true Received-SPF: pass client-ip=170.10.133.124; envelope-from=sebott@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org From: Cornelia Huck We now have the infrastructure in place to handle demuxed ID registers from kvm. Use it to get the values that kvm emulates for CCSIDR_EL1. Tested-by: Alireza Sanaee Signed-off-by: Cornelia Huck Signed-off-by: Sebastian Ott --- target/arm/kvm.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/target/arm/kvm.c b/target/arm/kvm.c index ed99be7fd8..1230acaff0 100644 --- a/target/arm/kvm.c +++ b/target/arm/kvm.c @@ -244,6 +244,33 @@ static int get_host_cpu_reg(int fd, ARMHostCPUFeatures *ahcf, return ret; } + +/* CSSELR values supported by kvm; used to index KVM_REG_ARM_DEMUX_ID_CCSIDR */ +#define CSSELR_MAX 14 + +static int get_host_cpu_reg_demux(int fd, ARMHostCPUFeatures *ahcf, + ARMIDRegisterIdx index, int subindex) +{ + + struct kvm_one_reg one_reg = { + .id = KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX, + }; + + switch (index) { + case CCSIDR_EL1_IDX: + if (subindex >= CSSELR_MAX) { + return -EINVAL; + } + one_reg.id |= KVM_REG_ARM_DEMUX_ID_CCSIDR | subindex; + one_reg.addr = (uintptr_t)&ahcf->isar.idregs[index + subindex]; + break; + default: + return -EINVAL; + } + + return ioctl(fd, KVM_GET_ONE_REG, &one_reg); +} + static uint32_t kvm_arm_sve_get_vls(int fd) { uint64_t vls[KVM_ARM64_SVE_VLS_WORDS]; @@ -454,6 +481,10 @@ static void kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf) /* Read the set of supported vector lengths. */ arm_host_cpu_features.sve_vq_supported = kvm_arm_sve_get_vls(fd); } + /* Grab demuxed registers. */ + for (int i = 0; i < CSSELR_MAX; i++) { + err |= get_host_cpu_reg_demux(fd, ahcf, CCSIDR_EL1_IDX, i); + } } kvm_arm_destroy_scratch_host_vcpu(fdarray); -- 2.55.0