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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1768843667; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=aPvnPaaK0u+4ohUVkIOSAe2b7NOHsNsQPRfXZZ57nGg=; b=iax16mGFLwM4DWl4RytHc8lM8TwST8dzZbqja1fK9360DzhFhws/O9xBKZpdnH9+yJm4sC GRVuz9643h6PbdVaIOLlMZlMU5hvo+UFIH3Qcjc4Xq99EyZlmge/lgHYQdS8XIZDXVcb1k Pev6xkaqXRddZhHB+bmXoRweTnwevOY= X-MC-Unique: 3vyIL3JZNGqiYUmB6tx-Qw-1 X-Mimecast-MFC-AGG-ID: 3vyIL3JZNGqiYUmB6tx-Qw_1768843665 From: Cornelia Huck To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Cc: Peter Maydell , Eric Auger , Cornelia Huck Subject: [PATCH RFC 3/3] arm/kvm: get demuxed ID registers from kvm Date: Mon, 19 Jan 2026 18:27:32 +0100 Message-ID: <20260119172732.140613-4-cohuck@redhat.com> In-Reply-To: <20260119172732.140613-1-cohuck@redhat.com> References: <20260119172732.140613-1-cohuck@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" We now have the infrastructure in place to get and save demuxed ID registers from kvm. Use it to get the values that kvm emulates for CCSIDR_EL1. Signed-off-by: Cornelia Huck --- target/arm/kvm.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/target/arm/kvm.c b/target/arm/kvm.c index 48f853fff80e..ab73b3a29f0f 100644 --- a/target/arm/kvm.c +++ b/target/arm/kvm.c @@ -243,6 +243,33 @@ static int get_host_cpu_reg(int fd, ARMHostCPUFeatures= *ahcf, return ret; } =20 +static int get_host_cpu_reg_demux(int fd, ARMHostCPUFeatures *ahcf, + ARMIDRegisterIdx index, int subindex) +{ + + struct kvm_one_reg one_reg =3D { + .id =3D KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX, + }; + ARMIDRegisterDemuxIdx demux_index; + + switch (index) { + case CCSIDR_EL1_IDX: + if (subindex < 14) { + one_reg.id |=3D KVM_REG_ARM_DEMUX_ID_CCSIDR | subindex; + } else { + return -EINVAL; + } + demux_index =3D CCSIDR_EL1_DEMUX_IDX; + break; + default: + return -EINVAL; + } + one_reg.addr =3D (uintptr_t)&ahcf->isar.idregs_demux[demux_index][subi= ndex]; + + return ioctl(fd, KVM_GET_ONE_REG, &one_reg); + +} + static bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf) { /* Identify the feature bits corresponding to the host CPU, and @@ -256,6 +283,7 @@ static bool kvm_arm_get_host_cpu_features(ARMHostCPUFea= tures *ahcf) bool pmu_supported =3D false; uint64_t features =3D 0; int err; + int i; =20 /* * target =3D -1 informs kvm_arm_create_scratch_host_vcpu() @@ -416,6 +444,11 @@ static bool kvm_arm_get_host_cpu_features(ARMHostCPUFe= atures *ahcf) */ err |=3D get_host_cpu_reg(fd, ahcf, ID_AA64ZFR0_EL1_IDX); } + /* grab demuxed registers */ + for (i =3D 0; i < 14; i++) { + /* KVM only allows 0..13 */ + err |=3D get_host_cpu_reg_demux(fd, ahcf, CCSIDR_EL1_IDX, i); + } } =20 kvm_arm_destroy_scratch_host_vcpu(fdarray); --=20 2.52.0