From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 6E1E4367294; Wed, 12 Aug 2026 19:13:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786562019; cv=none; b=CjibVH/4qgC1ebgjfjrBy5l3FOcycVHj9kWJw32aG7NqPK9YXhChrDUaVJ9LYy1XsnZPdNSuJQpiKR4+RDI7a4a6IrKxKeR+4m2X/YVgS7/8Y9MUaGyYCpAEHIEuRoXQ5MrkUG/BXGjq+97x1VZu4T8z/KGV+GYQdc2ASSCJ0ms= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786562019; c=relaxed/simple; bh=fG68MfhkwRfSg1W6YX0cbN8/yZcNS3S2f4yLKb+2+CU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ZZiHpdXN3zvwbcEasSRtc3es9boJbvlbFQ+hnyRsMjNsh32OLa+pAMeHlobDXWdX9hYwJqr3DCWwrmA/2S1hxFUmZc0ec408Css5BwyZ+/Zs9maExJ2rwoB6IavXJxbPDcrXjyLV3HZtIFPL4D8cogqpH0MFCnbVhyR6aPilSwU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aH/VAb63; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="aH/VAb63" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 30C701F00A3A; Wed, 12 Aug 2026 19:13:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786562018; bh=fiugukty1Mn9VBap85XV+9U6g61CkNYwrAZccCYiZGU=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=aH/VAb63NjO4aWXwR7JWuEYnBTHhuBjU+Z3WdshMCmFz64+M0jZXO7loOLriE2Mio XclGPrASPJe92tqkVCg+Gnlp6bpOOgozC6DI1HFhOCB1cBro5gn0Z7vvFCOPw7NHXm qgR8sbG6XK1EEt2ezn3nh+8zAlxDpWY/T1mxEc5kPBG9HBJ3xC/1lM5g4bIMRydbEz UEibOGEifsYFpygV2bfbzMx+xsdO5nDUCmI9OYfcP9L4a70PAX6mRElVro6RkP8VB7 0VLYsPm8zbT3USLE7ZcUhD7J608JSU3mAaxRPzlv53v8MblbXQNBFQiJa38Jl5lwpK XpokjY/5f70wg== From: Mark Brown Date: Wed, 12 Aug 2026 20:12:06 +0100 Subject: [PATCH v19 07/14] KVM: arm64: Forward GCS exceptions to nested guests Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260812-arm64-gcs-v19-7-9105afd828ac@kernel.org> References: <20260812-arm64-gcs-v19-0-9105afd828ac@kernel.org> In-Reply-To: <20260812-arm64-gcs-v19-0-9105afd828ac@kernel.org> To: Catalin Marinas , Will Deacon , Marc Zyngier , Joey Gouly , Suzuki K Poulose , Shuah Khan , Fuad Tabba , Oliver Upton Cc: Peter Maydell , Yao Yuan , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Mark Brown X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1286; i=broonie@kernel.org; h=from:subject:message-id; bh=fG68MfhkwRfSg1W6YX0cbN8/yZcNS3S2f4yLKb+2+CU=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBqfMW/S5d5PGH9T34XW+AA1po5WQjsknYblW3L3 C4IBv2XS2aJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCanzFvwAKCRAk1otyXVSH 0IAkCACBituvLEzDOaeuMRwbX42AwaQLAEUbskM76j5V8qSKjSK/Bf8H6BaOJ6TWn6DHWePPWL1 ILR0+l0PF72i1qJl/q02Q7s/gXAK/PI+pm9bG0dJ6DkIXtj7LIxgkU2tGNkB1ae23m0HTzzi2X/ 391xfgq2KAbVi+72vqu6oakyYPBf0N9XvEJqkcGkyTuJQU5An5h+TIMjbpnpY+EC8hHvc4K4Br3 CD7zkCUf5+KrJbOK8ZUHqciTfbXc2S4ws58mVotFbVpbTt2lM0a3vacQ9yZRDoF2y9prsIbaeTb CimgWWyuCpL9dATtag4rsJelCsDsZ1/xOskVMQaj8FYHoSjc X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB For nested guests where HFGITR_EL2.nGCSSTR_EL1 is clear or when there are L2 GCS data check exceptions we need to forward the exception to the guest. Add handling to do so. Signed-off-by: Mark Brown --- arch/arm64/kvm/handle_exit.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index 54aedf93c78b..63dcc4a0e69a 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -304,12 +304,24 @@ static int handle_svc(struct kvm_vcpu *vcpu) return 1; } +/* + * We might get GCS exceptions that need to be forwarded to the + * hypervisor when a nested guest has HFGITR_EL2.nGCSSTR_EL1 clear, or + * for a GCS data check exception for a L2 guest. + */ static int kvm_handle_gcs(struct kvm_vcpu *vcpu) { - /* We don't expect GCS, so treat it with contempt */ - if (kvm_has_feat(vcpu->kvm, ID_AA64PFR1_EL1, GCS, IMP)) - WARN_ON_ONCE(1); + if (!kvm_has_gcs(vcpu->kvm)) { + kvm_inject_undefined(vcpu); + return 1; + } + if (vcpu_has_nv(vcpu)) { + kvm_inject_nested_sync(vcpu, kvm_vcpu_get_esr(vcpu)); + return 1; + } + + WARN_ON_ONCE(1); kvm_inject_undefined(vcpu); return 1; } -- 2.47.3