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[2003:f6:af15:7401:9b2c:5947:d8ec:139e]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48e71bae25dsm3102924f8f.59.2026.10.30.07.34.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Oct 2026 07:34:44 -0700 (PDT) From: Sebastian Ott To: Peter Maydell , Eric Auger Cc: qemu-arm@nongnu.org, qemu-devel@nongnu.org, Sebastian Ott Subject: [PATCH 2/2] target/arm/cpu64: Define cpreg migration tolerance for PMMIR_EL1 Date: Fri, 30 Oct 2026 15:34:32 +0100 Message-ID: <20261030143435.57230-3-sebott@redhat.com> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261030143435.57230-1-sebott@redhat.com> References: <20261030143435.57230-1-sebott@redhat.com> X-Archived-By: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: A4n8i6516RFp04FHJsq3bS8_jOU29Wmi1WIlybnHf2U_1793370885 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: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham 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-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 PMMIR_EL1 is exposed from Linux v7.3 onwards. Backward migration to an older kernel would fail without cpreg migration tolerance definition for this register. Since qemu does not set KVM_ARM_VCPU_PMU_V3_STRICT the guest will RAZ this register for both the old and new kernel. Signed-off-by: Sebastian Ott --- target/arm/cpu64.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c index 96aeb6c7a0..1547ad1cd3 100644 --- a/target/arm/cpu64.c +++ b/target/arm/cpu64.c @@ -787,6 +787,14 @@ static void kvm_arm_set_cpreg_mig_tolerances(ARMCPU *cpu) arm_register_cpreg_mig_tolerance(cpu, ARM64_SYS_REG(3, 0, 10, 2, 3), 0, 0, ToleranceNotOnBothEnds); + /* + * PMMIR_EL1 was unconditionally exposed for linux 7.3 with commit + * 453f6ff04b8d ("KVM: arm64: Expose PMMIR_EL1.SLOTS under strict + * PMUv3 UAPI"). Tolerate backward migration to an older kernel. + */ + arm_register_cpreg_mig_tolerance(cpu, ARM64_SYS_REG(3, 0, 9, 14, 6), + 0, 0, ToleranceNotOnBothEnds); + /* * KVM_REG_ARM_VENDOR_HYP_BMAP_2 pseudo FW register is exposed * from v6.15 onwards. Backward migration from a >= v6.15 to an older -- 2.56.0