From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.136 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793883925; b=x6dEe9hgxEqMyim8nsAG1f2FnK0nWULxYumJffH0Yt8POI64i7v2Wc/QhBGViH39Qid/ IujACt4W4KkrFYGJRv90cJhrjY1QeeWcqCjombufvYS6jtMjhxReqJdjlxXU62qlsF6ip Z3DdX12DFqzSSkHshBXEmHO0N9S9c7nvwkUkS5OHBstOyRPOrrx0zZmgpxjhLXLrOsl4m PXNXf1AaFjLkjh+aFcgsuXjKvq05vFqOVDlymELu7UKWWw5n6K0EI48cUdo3smNvCzPb9 z+8bsGxWWWM3ZlSTkukFdVs9LV+8IJKKsg/AjuhTGVUqxs+N0rg98BNLrFPV+fcmVmw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793883925; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:From:To:Cc:Subject:Date:Message-ID: X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; bh=9k9K8nTEYmyXFaOgzj1P2GDgV/Rf++l8doHLxGAc6VA=; b=ez8m1MWG9tWllRntraVAuye+tfRwVgiCLwXELiiuzKVpQgmgnp4CLO2HXP9NNumGKDFq JZ/BCwNHjlOfZSreL/ONFiA5YHIuZ35RcAg59EPutCI4BeZWUw3xZI31zEaQxp+C+JGII 4g4btBInCtbCq6skb0nmbyfeqcQKRuU2Ig+k/+YQ0RZcFf7OB0c7WFwI2JTkODKtEnx9l 0rFvgaiIXi1hR0SZwds/HpUf9TdYMfzaTN7B9dNskY4LN4TmsBk5fkT608LD0OFBFm3i1 57JdpvM5C+kyCSErn2Fu67Lzs7+Y8Ht4MMy/qfpbPHjokSF9sciBac2M7Jg6bRKqDtQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=fltH9I28; arc=none smtp.remote-ip=95.215.58.136 Received: from mta1.migadu.com (out-136.mta1.migadu.com [95.215.58.136]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B68CA606D82B for ; Thu, 5 Nov 2026 13:05:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org B68CA606D82B Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=fltH9I28 X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=l8jzR9UTrR8//YSZuL9grlpdOXVS3eekgMJRG6e6qXQ=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1793883923; v=1; x=1794488723; b=fltH9I28zS669EFKUw+4626g8jMomi52ozVGsHX8+4nTibDk8LwCRW+mxUnSuT9BW5V0LVvb ZkaVjKFyOd182dd38jCE+Y+MCUFtp5CTM2J3F9mUEjnVnjgoRU8neRHDQid7dcGF+2C0LZmjHpv 8G5UuXdSBG2Z8jMegRmgJbNE= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 4942c736930b283a; Thu, 05 Nov 2026 13:05:19 +0000 X-Mizu-Trace-ID: 4942c736930b283a X-Migadu-Flow: FLOW_OUT From: Fuad Tabba To: Marc Zyngier , Oliver Upton , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: Joey Gouly , Suzuki K Poulose , Zenghui Yu , Steffen Eiden , Catalin Marinas , Will Deacon , Mark Rutland , Vincent Donnefort , Fuad Tabba , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/4] KVM: arm64: Advertise ID_AA64ZFR0_EL1 to protected VMs Date: Thu, 5 Nov 2026 13:04:55 +0000 Message-ID: <20261105130456.1617185-4-fuad.tabba@linux.dev> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261105130456.1617185-1-fuad.tabba@linux.dev> References: <20261105130456.1617185-1-fuad.tabba@linux.dev> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit EL2 builds a protected guest's ID registers from the host's sanitised values, most of them capped per field. It has no case for ID_AA64ZFR0_EL1, so the register reads as 0, and a protected guest with SVE wouldn't see any of the SVE extensions the CPUs implement. Keep a copy of the host's sanitised ID_AA64ZFR0_EL1 at EL2, and advertise it when the guest has SVE, as KVM does for a non-protected guest. Cap each field at the highest value the sysreg file defines. Signed-off-by: Fuad Tabba --- arch/arm64/include/asm/kvm_hyp.h | 1 + arch/arm64/kvm/arm.c | 1 + arch/arm64/kvm/hyp/nvhe/sys_regs.c | 19 +++++++++++++++++++ 3 files changed, 21 insertions(+) diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h index 8cf42f87526dd..b9455ff8d7bdb 100644 --- a/arch/arm64/include/asm/kvm_hyp.h +++ b/arch/arm64/include/asm/kvm_hyp.h @@ -144,6 +144,7 @@ void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt); extern u64 kvm_nvhe_sym(id_aa64pfr0_el1_sys_val); extern u64 kvm_nvhe_sym(id_aa64pfr1_el1_sys_val); extern u64 kvm_nvhe_sym(id_aa64pfr2_el1_sys_val); +extern u64 kvm_nvhe_sym(id_aa64zfr0_el1_sys_val); extern u64 kvm_nvhe_sym(id_aa64isar0_el1_sys_val); extern u64 kvm_nvhe_sym(id_aa64isar1_el1_sys_val); extern u64 kvm_nvhe_sym(id_aa64isar2_el1_sys_val); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 157bf4b812020..be5127ce388a8 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -2827,6 +2827,7 @@ static void kvm_hyp_init_symbols(void) kvm_nvhe_sym(id_aa64pfr0_el1_sys_val) = get_hyp_id_aa64pfr0_el1(); kvm_nvhe_sym(id_aa64pfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1); kvm_nvhe_sym(id_aa64pfr2_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64PFR2_EL1); + kvm_nvhe_sym(id_aa64zfr0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ZFR0_EL1); kvm_nvhe_sym(id_aa64isar0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR0_EL1); kvm_nvhe_sym(id_aa64isar1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR1_EL1); kvm_nvhe_sym(id_aa64isar2_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR2_EL1); diff --git a/arch/arm64/kvm/hyp/nvhe/sys_regs.c b/arch/arm64/kvm/hyp/nvhe/sys_regs.c index 06ea91415ad8b..e6bbc897cd7b1 100644 --- a/arch/arm64/kvm/hyp/nvhe/sys_regs.c +++ b/arch/arm64/kvm/hyp/nvhe/sys_regs.c @@ -21,6 +21,7 @@ u64 id_aa64pfr0_el1_sys_val; u64 id_aa64pfr1_el1_sys_val; u64 id_aa64pfr2_el1_sys_val; +u64 id_aa64zfr0_el1_sys_val; u64 id_aa64isar0_el1_sys_val; u64 id_aa64isar1_el1_sys_val; u64 id_aa64isar2_el1_sys_val; @@ -114,6 +115,22 @@ static const struct pvm_ftr_bits pvmid_aa64pfr2[] = { FEAT_END }; +static const struct pvm_ftr_bits pvmid_aa64zfr0[] = { + MAX_FEAT_FUNC(ID_AA64ZFR0_EL1, SVEver, SVE2p3, vm_has_sve), + MAX_FEAT_FUNC(ID_AA64ZFR0_EL1, AES, AES2, vm_has_sve), + MAX_FEAT_FUNC(ID_AA64ZFR0_EL1, EltPerm, IMP, vm_has_sve), + MAX_FEAT_FUNC(ID_AA64ZFR0_EL1, BitPerm, IMP, vm_has_sve), + MAX_FEAT_FUNC(ID_AA64ZFR0_EL1, BF16, EBF16, vm_has_sve), + MAX_FEAT_FUNC(ID_AA64ZFR0_EL1, B16B16, B16MM, vm_has_sve), + MAX_FEAT_FUNC(ID_AA64ZFR0_EL1, SHA3, IMP, vm_has_sve), + MAX_FEAT_FUNC(ID_AA64ZFR0_EL1, SM4, IMP, vm_has_sve), + MAX_FEAT_FUNC(ID_AA64ZFR0_EL1, I8MM, IMP, vm_has_sve), + MAX_FEAT_FUNC(ID_AA64ZFR0_EL1, F16MM, IMP, vm_has_sve), + MAX_FEAT_FUNC(ID_AA64ZFR0_EL1, F32MM, IMP, vm_has_sve), + MAX_FEAT_FUNC(ID_AA64ZFR0_EL1, F64MM, IMP, vm_has_sve), + FEAT_END +}; + static const struct pvm_ftr_bits pvmid_aa64mmfr0[] = { MAX_FEAT_ENUM(ID_AA64MMFR0_EL1, PARANGE, 40), MAX_FEAT_ENUM(ID_AA64MMFR0_EL1, ASIDBITS, 16), @@ -232,6 +249,8 @@ static u64 pvm_calc_id_reg(const struct kvm_vcpu *vcpu, u32 id) return get_restricted_features(vcpu, id_aa64pfr1_el1_sys_val, pvmid_aa64pfr1); case SYS_ID_AA64PFR2_EL1: return get_restricted_features(vcpu, id_aa64pfr2_el1_sys_val, pvmid_aa64pfr2); + case SYS_ID_AA64ZFR0_EL1: + return get_restricted_features(vcpu, id_aa64zfr0_el1_sys_val, pvmid_aa64zfr0); case SYS_ID_AA64ISAR0_EL1: return id_aa64isar0_el1_sys_val; case SYS_ID_AA64ISAR1_EL1: -- 2.47.3