From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=91.218.175.237 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794214138; b=WZhyYIK05zzCzDBtl+D/boaUsaSI9KaMRwWADn9tzrcJH9S9IQWx+qMEGgs/vuaOOw2L H4o0iRuubN+wG8jWbVQFSsGA3vDoNwCqXdg5Yst6ejuU+6wstfo3nXHq8+ph102eBKEKY PFzncENdi9+m6tRudjoouUb+8qsg6hfrU0DfaASEOlGrpPlDCppB+Vlec53nFSvTT7kR4 mh/8ScRDMnHJ9fOGV/qYQr/oWZ9JDOBWbVdhVFsgWduuaRu/cUxdD06s3vqJwCErPJuZn VlMrPCi9uIZdmmmLas4ZiMrk9aJxTBiDZOPLNb0ioJhIa72t5nB2SwX7CgsOn5AfR1w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794214138; 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=9EDiuahpoC5a8fdBVjn+7UwWB1qVxtY459zTXN5uFBc=; b=LN14AFJQQXVQeWDoYTAlvzI+U43d9PZLflLr+KxxfuFAQSAxECtIGrO5cy7bHqL/3PH3 UaPwfuwuBPNw4Xl0ZdnUKeFjMHc/8JMiiVJoPn9QFOoIb2fjcN8DCdt9TmGEuAgwn+CKL rrKq/pNlbUMZCZOE+IocN/bjeG945/zRBoDFkKCCv6kwDKmF1C8ggj/MAiHxhuComjvLl dZ83mcFJ4c+UBSwotOBdkO8tr2jxzqrJuTwbdkKxvQnh4MjxXfe6CBheeYRFQDckP8fRi 0Q+mjYOOor9sGd8qnlx1uUPdIn5lTCs/j2WVW7DvIkY1586VD4U3qhT6xWTFwRg5QbA== 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=aKniBgn2; arc=none smtp.remote-ip=91.218.175.237 Received: from mta0.migadu.com (out-237.mta0.migadu.com [91.218.175.237]) (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 C9378606A32A for ; Mon, 9 Nov 2026 08:48:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org C9378606A32A 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=aKniBgn2 X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=zpKaD0TgIJfqXkuMLyaymhMm6AH9D97hWArAafrSB6U=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1794214136; v=1; x=1794818936; b=aKniBgn25IHI6/+paezktja3kzUe2XHYTbZvR+c/c7IlRhOWL6NzzF3m11fb8KQs/r5okijz /HUM78yf3sesqRmdI2T9Ze8vyBoxAkGO0SMDUqxoZWloB6hglXKhuB9wlHE1fyeWgZUyqlOV3x1 R8V3eI0h2bytT8Y8YlFyZWJ8= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 9a819a32ecff5883; Mon, 09 Nov 2026 08:48:55 +0000 X-Mizu-Trace-ID: 9a819a32ecff5883 X-Migadu-Flow: FLOW_OUT From: Fuad Tabba To: Marc Zyngier , Oliver Upton Cc: Will Deacon , Catalin Marinas , Mark Rutland , Paolo Bonzini , Sean Christopherson , Shuah Khan , Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Vincent Donnefort , Quentin Perret , Fuad Tabba , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 01/19] KVM: arm64: Hide generic ptrauth from protected VMs without ptrauth Date: Mon, 9 Nov 2026 08:48:36 +0000 Message-ID: <20261109084854.840576-2-fuad.tabba@linux.dev> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261109084854.840576-1-fuad.tabba@linux.dev> References: <20261109084854.840576-1-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 A protected VM without the ptrauth vCPU features shouldn't have pointer authentication in its ID registers. Commit 3d7ff00700d1 ("KVM: arm64: Rework specifying restricted features for protected VMs") gated APA, API, APA3 and GPA3 on vm_has_ptrauth(), but left GPA and GPI capped at IMP. So generic authentication is advertised to a protected guest without ptrauth, and PACGA UNDEFs. Gate GPA and GPI on vm_has_ptrauth() too. Fixes: 3d7ff00700d1 ("KVM: arm64: Rework specifying restricted features for protected VMs") Signed-off-by: Fuad Tabba --- arch/arm64/kvm/hyp/nvhe/sys_regs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/hyp/nvhe/sys_regs.c b/arch/arm64/kvm/hyp/nvhe/sys_regs.c index 32e82653ebf7e..e5502d5651b05 100644 --- a/arch/arm64/kvm/hyp/nvhe/sys_regs.c +++ b/arch/arm64/kvm/hyp/nvhe/sys_regs.c @@ -157,8 +157,8 @@ static const struct pvm_ftr_bits pvmid_aa64isar1[] = { MAX_FEAT(ID_AA64ISAR1_EL1, JSCVT, IMP), MAX_FEAT(ID_AA64ISAR1_EL1, FCMA, IMP), MAX_FEAT(ID_AA64ISAR1_EL1, LRCPC, LRCPC3), - MAX_FEAT(ID_AA64ISAR1_EL1, GPA, IMP), - MAX_FEAT(ID_AA64ISAR1_EL1, GPI, IMP), + MAX_FEAT_FUNC(ID_AA64ISAR1_EL1, GPA, IMP, vm_has_ptrauth), + MAX_FEAT_FUNC(ID_AA64ISAR1_EL1, GPI, IMP, vm_has_ptrauth), MAX_FEAT(ID_AA64ISAR1_EL1, FRINTTS, IMP), MAX_FEAT(ID_AA64ISAR1_EL1, SB, IMP), MAX_FEAT(ID_AA64ISAR1_EL1, SPECRES, COSP_RCTX), -- 2.47.3