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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1763482214; 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=oe9X9vrtzuAvfuKIbXQg7zoSn4VcD4HMrEpnSfOuFKg=; b=aaUDFUSkPaVAhVJa0DfZ3Q7rdRyNgqpAWQT5/UpoFnHp+hkqWfWRtxjpa0jsTkc71J1S1q F4nNjJjqxU7FsPLWlcsUZtIETe3gMecfJ9JCzDZ49cOx/A7cgihq6FyggbbYhblTwG6uVL mtz+/HDtU2t0BJOeoxxGYOZ08sn7Ux8= X-MC-Unique: E3JPMRIzOsevxW9EbuKpBA-1 X-Mimecast-MFC-AGG-ID: E3JPMRIzOsevxW9EbuKpBA_1763482208 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, maz@kernel.org, oliver.upton@linux.dev, sebott@redhat.com, gshan@redhat.com, ddutile@redhat.com, peterx@redhat.com, philmd@linaro.org, pbonzini@redhat.com Subject: [PATCH v2 7/8] target/arm/cpu: Expose x-mig-hidden-regs and x-mig-safe-missing-regs properties Date: Tue, 18 Nov 2025 17:07:37 +0100 Message-ID: <20251118160920.554809-8-eric.auger@redhat.com> In-Reply-To: <20251118160920.554809-1-eric.auger@redhat.com> References: <20251118160920.554809-1-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" Allows to set both array properties along with arm cpus. Their "x-" prefix reminds that those shall be used carefully for distro specific use cases to garantee cross kernel migration. This will allow to define such compat machine props like: static GlobalProperty arm_virt_kernel_compat_10_1[] =3D { /* KVM_REG_ARM_VENDOR_HYP_BMAP_2 */ { TYPE_ARM_CPU, "x-mig-hidden-regs", "0x6030000000160003" }, { TYPE_ARM_CPU, "x-mig-safe-missing-regs", /* TCR_EL1, PIRE0_EL1, PIR_EL1 */ "0x603000000013c103, 0x603000000013c512, 0x603000000013c513" }, } The first one means KVM_REG_ARM_VENDOR_HYP_BMAP_2 shall always been hidden for machine types older than 10.1. The second one means that along with 10.1 machine type we may receive in the incoming migration stream, 3 registers that are unknown on destination. Obvioulsy, using the reg index as defined in linux/Documentation/virt/kvm/api.rst is not user friendly. However those options, prefixed with "x-" are supposed to be used rarely by people who know the details. Signed-off-by: Eric Auger --- target/arm/cpu.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/target/arm/cpu.c b/target/arm/cpu.c index 066746d76f..c41774cb4c 100644 --- a/target/arm/cpu.c +++ b/target/arm/cpu.c @@ -2248,6 +2248,11 @@ static const Property arm_cpu_properties[] =3D { DEFINE_PROP_BOOL("backcompat-cntfrq", ARMCPU, backcompat_cntfrq, false= ), DEFINE_PROP_BOOL("backcompat-pauth-default-use-qarma5", ARMCPU, backcompat_pauth_default_use_qarma5, false), + DEFINE_PROP_ARRAY("x-mig-hidden-regs", ARMCPU, + nr_hidden_regs, hidden_regs, qdev_prop_uint64, uint6= 4_t), + DEFINE_PROP_ARRAY("x-mig-safe-missing-regs", ARMCPU, + nr_mig_safe_missing_regs, mig_safe_missing_regs, + qdev_prop_uint64, uint64_t), }; =20 static const gchar *arm_gdb_arch_name(CPUState *cs) --=20 2.51.1