From nobody Mon Jun 15 10:50:01 2026 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A74623DF010; Thu, 9 Apr 2026 15:29:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775748554; cv=none; b=c3YvlNFli5xdZxacOe3oa52HSIai0IhiMNFuypt0Z1t8ui0ozlXmV5cY0Jc8kaw/sl/DIFraJ3hJAQGA8cEqFYRXy7xk74pXR015DBIusUvLdodJ9YbaR6WFmJL9BXkboD7PneVHv4qFUiCIEEAerRyvT45jfIqqPQf89qsWZqQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775748554; c=relaxed/simple; bh=efHZCN1DJrFqL1fSQk1MrwRRN8zq1AkJYsw8UqbcTMw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=sIlqQweAXomGif7/babY1WMXX2+D6M+DePgIXO/GVybhzbCzfpzBr79/LNj/kFaTZYgJzuWYHCrFxy3yV9GkB28HddRUTVrwxyJSbDdd2z/numYSFqWg6/sqwHr8U8fu3VGo+1qIbmCJMg8fG4gYaZC/77DrFIT9x578ZReY/P0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=n1/wrVAs; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="n1/wrVAs" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=bhFlBoSxjJMIlReh1caBfDI3G8k5kHCJIUA4Zgiq094=; b=n1/wrVAsdN9fGhc8RZ64w59501 RFjiXhsGPvJzLhzK66hPBeOi7W+SHeD7X8qh5O2wlDWC7wVaRt0ioegU4bmrGwj8VjiZNKmhq2vp9 1JkWLD12veXOidcn7xGiUciTe541y6cF15mBmXHPu9gYkNn/R9yViA7ODqi52uUTKvyGhvxgmPMtT 72bZhf7cCX7E0TIvaduKJQJFZnuq7dgHqhPCQ4Fhah6rg8Qw5uMV8CZim5gT6DKfy5Ui8KR5/dst6 n28Og+N+m819DFgtltBDr8sGxLlg+Z9fE4V33HMXv0fpx1384DYweuuLO/gxek+f42LpkV6KZEkfU +B3av7kA==; Received: from [172.31.31.148] (helo=u09cd745991455d.lumleys.internal) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1wArJa-0000000BzQE-3Uqh; Thu, 09 Apr 2026 15:29:06 +0000 Message-ID: <7fb7b823c68e04321eb532a5b8ae21a818d4926d.camel@infradead.org> Subject: [PATCH] KVM: arm64: Add KVM_CAP_ARM_NATIVE_CACHE_CONFIG vcpu capability From: David Woodhouse To: akihiko.odaki@daynix.com, "Gutierrez Cantu, Bernardo" Cc: alexandru.elisei@arm.com, alyssa@rosenzweig.io, asahi@lists.linux.dev, broonie@kernel.org, catalin.marinas@arm.com, james.morse@arm.com, kvmarm@lists.cs.columbia.edu, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, marcan@marcan.st, mathieu.poirier@linaro.org, maz@kernel.org, oliver.upton@linux.dev, suzuki.poulose@arm.com, sven@svenpeter.dev, will@kernel.org Date: Thu, 09 Apr 2026 16:29:06 +0100 In-Reply-To: References: Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-fUCIPL1EFDn51viUi3G3" User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html --=-fUCIPL1EFDn51viUi3G3 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse Commit 7af0c2534f4c5 ("KVM: arm64: Normalize cache configuration") fabricates CLIDR_EL1 and CCSIDR_EL1 values instead of using the real hardware values. While this provides consistent values across heterogeneous CPUs, it does cause visible changes in the CPU model exposed to guests. The commit claims that userspace can restore the original values, but there is no way for userspace to obtain the real CLIDR_EL1 register value =E2=80=94 it is not fully reconstructible from sysfs, which lacks the LoC, LoUU, and LoUIS fields. Add a per-vcpu KVM_CAP_ARM_NATIVE_CACHE_CONFIG capability that reads the real CLIDR_EL1 and all CCSIDR_EL1 values from the current physical CPU and sets them on the vcpu. This allows hypervisors to present the real hardware cache configuration to guests, which is important for consistency of the environment across kernel versions and for migration compatibility with hosts running older kernels that exposed the real values. Fixes: 7af0c2534f4c ("KVM: arm64: Normalize cache configuration") Signed-off-by: David Woodhouse --- Documentation/virt/kvm/api.rst | 23 ++++++++ arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/kvm/arm.c | 17 ++++++ arch/arm64/kvm/sys_regs.c | 26 ++++++++++ include/uapi/linux/kvm.h | 1 + tools/testing/selftests/kvm/Makefile.kvm | 1 + .../selftests/kvm/arm64/native_cache_config.c | 52 +++++++++++++++++++ 7 files changed, 121 insertions(+) create mode 100644 tools/testing/selftests/kvm/arm64/native_cache_config.c diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index e3b3bd9edeec..ee47dc07ceac 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -8930,6 +8930,29 @@ no-op. =20 ``KVM_CHECK_EXTENSION`` returns the bitmask of exits that can be disabled. =20 +7.48 KVM_CAP_ARM_NATIVE_CACHE_CONFIG +------------------------------------- + +:Architecture: arm64 +:Target: vcpu +:Parameters: none +:Returns: 0 on success, -ENOMEM on allocation failure, -EINVAL if + args[0] or flags are non-zero. + +This per-vcpu capability reads the real CLIDR_EL1 and CCSIDR_EL1 values +from the physical CPU on which the ioctl is executed, and sets them on +the vcpu. This replaces the fabricated cache configuration that KVM +provides by default. + +The caller should ensure the vcpu thread is pinned to the desired +physical CPU before invoking this capability, so that the correct cache +topology is captured. On heterogeneous systems, different physical CPUs +may have different cache configurations. + +After this capability is enabled, the vcpu's CLIDR_EL1 and CCSIDR_EL1 +values can still be overridden individually via ``KVM_SET_ONE_REG`` and +the ``KVM_REG_ARM_DEMUX`` interface. + 8. Other capabilities. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =20 diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm= _host.h index a1bb025c641f..c9713a472c47 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -1296,6 +1296,7 @@ void kvm_sys_regs_create_debugfs(struct kvm *kvm); void kvm_reset_sys_regs(struct kvm_vcpu *vcpu); =20 int __init kvm_sys_reg_table_init(void); +int kvm_vcpu_set_native_cache_config(struct kvm_vcpu *vcpu); struct sys_reg_desc; int __init populate_sysreg_config(const struct sys_reg_desc *sr, unsigned int idx); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 326a99fea753..579583e8dc5c 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -393,6 +393,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long= ext) case KVM_CAP_ARM_DISABLE_EXITS: r =3D KVM_ARM_DISABLE_VALID_EXITS; break; + case KVM_CAP_ARM_NATIVE_CACHE_CONFIG: + case KVM_CAP_ENABLE_CAP: + r =3D 1; + break; case KVM_CAP_SET_GUEST_DEBUG2: return KVM_GUESTDBG_VALID_MASK; case KVM_CAP_ARM_SET_DEVICE_ADDR: @@ -1793,6 +1797,19 @@ long kvm_arch_vcpu_ioctl(struct file *filp, r =3D kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init); break; } + case KVM_ENABLE_CAP: { + struct kvm_enable_cap cap; + + r =3D -EFAULT; + if (copy_from_user(&cap, argp, sizeof(cap))) + break; + + r =3D -EINVAL; + if (cap.cap =3D=3D KVM_CAP_ARM_NATIVE_CACHE_CONFIG && + !cap.args[0] && !cap.flags) + r =3D kvm_vcpu_set_native_cache_config(vcpu); + break; + } case KVM_SET_ONE_REG: case KVM_GET_ONE_REG: { struct kvm_one_reg reg; diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 1b4cacb6e918..c19d84e48f8b 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -484,6 +484,32 @@ static int set_ccsidr(struct kvm_vcpu *vcpu, u32 cssel= r, u32 val) return 0; } =20 +int kvm_vcpu_set_native_cache_config(struct kvm_vcpu *vcpu) +{ + u32 csselr; + + if (!vcpu->arch.ccsidr) { + vcpu->arch.ccsidr =3D kmalloc_array(CSSELR_MAX, sizeof(u32), + GFP_KERNEL_ACCOUNT); + if (!vcpu->arch.ccsidr) + return -ENOMEM; + } + + local_irq_disable(); + + __vcpu_assign_sys_reg(vcpu, CLIDR_EL1, read_sysreg(clidr_el1)); + + for (csselr =3D 0; csselr < CSSELR_MAX; csselr++) { + write_sysreg(csselr, csselr_el1); + isb(); + vcpu->arch.ccsidr[csselr] =3D read_sysreg(ccsidr_el1); + } + + local_irq_enable(); + + return 0; +} + static bool access_rw(struct kvm_vcpu *vcpu, struct sys_reg_params *p, const struct sys_reg_desc *r) diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 694cf699ed0a..2d8bbb4dd69b 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -995,6 +995,7 @@ struct kvm_enable_cap { #define KVM_CAP_S390_USER_OPEREXEC 246 #define KVM_CAP_S390_KEYOP 247 #define KVM_CAP_ARM_DISABLE_EXITS 248 +#define KVM_CAP_ARM_NATIVE_CACHE_CONFIG 249 =20 struct kvm_irq_routing_irqchip { __u32 irqchip; diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selft= ests/kvm/Makefile.kvm index ad9f9fa181a1..8e05cc8ec204 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -182,6 +182,7 @@ TEST_GEN_PROGS_arm64 +=3D arm64/vgic_group_iidr TEST_GEN_PROGS_arm64 +=3D arm64/vgic_group_v2 TEST_GEN_PROGS_arm64 +=3D arm64/vpmu_counter_access TEST_GEN_PROGS_arm64 +=3D arm64/no-vgic-v3 +TEST_GEN_PROGS_arm64 +=3D arm64/native_cache_config TEST_GEN_PROGS_arm64 +=3D arm64/idreg-idst TEST_GEN_PROGS_arm64 +=3D arm64/kvm-uuid TEST_GEN_PROGS_arm64 +=3D access_tracking_perf_test diff --git a/tools/testing/selftests/kvm/arm64/native_cache_config.c b/tool= s/testing/selftests/kvm/arm64/native_cache_config.c new file mode 100644 index 000000000000..4afea32f2348 --- /dev/null +++ b/tools/testing/selftests/kvm/arm64/native_cache_config.c @@ -0,0 +1,52 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * native_cache_config.c - Test KVM_CAP_ARM_NATIVE_CACHE_CONFIG + * + * Verify that enabling the capability populates the vcpu's CLIDR_EL1 + * with the real hardware value instead of the fabricated default. + */ +#include "test_util.h" +#include "kvm_util.h" +#include "processor.h" + +#define CLIDR_EL1_REG_ID ARM64_SYS_REG(3, 1, 0, 0, 1) + +int main(int argc, char *argv[]) +{ + struct kvm_enable_cap cap =3D { + .cap =3D KVM_CAP_ARM_NATIVE_CACHE_CONFIG, + }; + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + uint64_t clidr_before, clidr_after; + int r; + + TEST_REQUIRE(kvm_has_cap(KVM_CAP_ARM_NATIVE_CACHE_CONFIG)); + + vm =3D vm_create_with_one_vcpu(&vcpu, NULL); + + /* Read the fabricated CLIDR_EL1 */ + clidr_before =3D vcpu_get_reg(vcpu, CLIDR_EL1_REG_ID); + + /* Enable native cache config */ + r =3D __vcpu_ioctl(vcpu, KVM_ENABLE_CAP, &cap); + TEST_ASSERT(!r, "KVM_ENABLE_CAP failed: %d (errno %d)", r, errno); + + /* Read CLIDR_EL1 again */ + clidr_after =3D vcpu_get_reg(vcpu, CLIDR_EL1_REG_ID); + + pr_info("CLIDR_EL1 before: 0x%016lx\n", clidr_before); + pr_info("CLIDR_EL1 after: 0x%016lx\n", clidr_after); + + TEST_ASSERT(clidr_after !=3D 0, + "CLIDR_EL1 should not be zero after native config"); + + /* Invalid: non-zero args should fail */ + cap.args[0] =3D 1; + r =3D __vcpu_ioctl(vcpu, KVM_ENABLE_CAP, &cap); + TEST_ASSERT(r =3D=3D -1 && errno =3D=3D EINVAL, + "Non-zero args should fail: got %d errno %d", r, errno); + + kvm_vm_free(vm); + return 0; +} --=20 2.43.0 --=-fUCIPL1EFDn51viUi3G3 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx 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