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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1772619794; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=03mbM0/BeN+WXm2eQJUmR9ksOYXDVh2zXytC95ekuZY=; b=Qh/0EJbfBZ7T5MXjocdyI7hQcet965k3qAJSomnNo7HzGkAsQZ9MLEtnH80Ne1cCtTPbfS t9cKD7oeSL/1sxSIy1iXPS9Nq2yaCGpDCC5Ny6sXQj1d/1Ez0rxrNpciCcdmHGovUAH+3m RPwgi5J7KqWAaL6OMKbAIdpC7ZSZp9M= X-MC-Unique: lfGPHIYaO1uPdMOYo0zHcA-1 X-Mimecast-MFC-AGG-ID: lfGPHIYaO1uPdMOYo0zHcA_1772619790 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, cohuck@redhat.com, sebott@redhat.com, peterx@redhat.com, philmd@linaro.org, alex.bennee@linaro.org Subject: [PATCH v8 4/6] target/arm/cpu64: Define cpreg migration tolerance for KVM_REG_ARM_VENDOR_HYP_BMAP_2 Date: Wed, 4 Mar 2026 11:22:08 +0100 Message-ID: <20260304102249.1963784-5-eric.auger@redhat.com> In-Reply-To: <20260304102249.1963784-1-eric.auger@redhat.com> References: <20260304102249.1963784-1-eric.auger@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" KVM_REG_ARM_VENDOR_HYP_BMAP_2 pseudo FW register is exposed from v6.15 onwards. Backward migration from a >=3D v6.15 to an older kernel would fail without cpreg migration tolerance definition for this register. Signed-off-by: Eric Auger Reviewed-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 4cfddc6e8c0..abc6b78ef7d 100644 --- a/target/arm/cpu64.c +++ b/target/arm/cpu64.c @@ -833,6 +833,14 @@ static void kvm_arm_set_cpreg_mig_tolerances(ARMCPU *c= pu) 0, 0, ToleranceNotOnBothEnds); arm_register_cpreg_mig_tolerance(cpu, ARM64_SYS_REG(3, 0, 10, 2, 3), 0, 0, ToleranceNotOnBothEnds); + + /* + * KVM_REG_ARM_VENDOR_HYP_BMAP_2 pseudo FW register is exposed + * from v6.15 onwards. Backward migration from a >=3D v6.15 to an older + * kernel would fail without cpreg migration tolerance definition + */ + arm_register_cpreg_mig_tolerance(cpu, KVM_REG_ARM_FW_FEAT_BMAP_REG(3), + 0, 0, ToleranceNotOnBothEnds); } =20 static void aarch64_host_initfn(Object *obj) --=20 2.53.0