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 2078F3BB9EB; Thu, 30 Jul 2026 07:11:04 +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=1785395468; cv=none; b=ZJI1fNg/uVjCgQIEQaea7cluaV2e8rnhHT03rg5hklr6GZvWShEzNasTklcSohZKyQmqmocyO41f2zGWANPxL+PuxsBREJgj+Q9ux2JwV040apAM+9M+qTJ7VSbZu8GfX26um6befYH7kGOqc/P7EGNeVAPngAhj7NOkvl82uiQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785395468; c=relaxed/simple; bh=1a6g0FUNYjctw5B94xyjRpZGAbx7YJm1TxMbIoRmB4Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Zi9Le9RO/phed7QvpWgoagkAlQ7uw2ejdNFIFfLXo1zc0xk1DpdSaKbAD3ULeWIK52chwWe/yWscVKy8lR3MyISC+P2prakMfhIweqlv2eK9VWehdl8GnblJJc2RdlH6MjG13alCbrbSXNhKJZD4xP4pXNtCYNWvvj/JDYwpyg8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=B4EI8Mgt; 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="B4EI8Mgt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BFC4F1F01573; Thu, 30 Jul 2026 07:10:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785395454; bh=xvfRoiVVXMz5ozRg++qNQ5fER4Qs3LDX4/NpXBs7HWc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=B4EI8MgtwgNFmzLk66mckYalz5k0UsVHZg/+KnxJYfcmTb4ILMzkrM3+TZRgQ/QW5 zDZ6V7yHI87IT7t6gww1ww6aADHGLnrLRLajQrGF37qS26Pv0D3+f+IxEi/YR+ENG/ bqA4C7C0kyV0LB9Y1Ff45QvHhpLOB2wkxvfLpFJ5Pcfj3LOImw9colz/s6CkPXaYH2 h8QlWkAHPaxSpinohrV3sTLwFoE4g6WZSi/CkjolMVlGkoNEGVXCRICOjDmnjfaGDu +9Qd8um1XFrUOPdDq5NlWuiNdZ3vt8LK0O1VNsS1RjUVCAAqO3ZWX6VhoxSS/S/pi9 zAU5kek6UUrYQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1wpKur-0000000AOpW-0YI6; Thu, 30 Jul 2026 07:10:53 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Steffen Eiden , Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Yao Yuan , Wei-Lin Chang , Vladimir Murzin Subject: [PATCH v4 22/29] KVM: arm64: Add routing for NVHCR_EL2 trap Date: Thu, 30 Jul 2026 08:10:15 +0100 Message-ID: <20260730071022.296811-23-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260730071022.296811-1-maz@kernel.org> References: <20260730071022.296811-1-maz@kernel.org> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, seiden@linux.ibm.com, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, yuzenghui@huawei.com, yaoyuan@linux.alibaba.com, weilin.chang@arm.com, vladimir.murzin@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false NVHCR_EL2 accesses from EL1 are taken to EL2 when HCRX_EL2.NVTGE==0 and HCR_EL2.NV==1. Describe this in the exception routing tables. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/emulate-nested.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/arm64/kvm/emulate-nested.c b/arch/arm64/kvm/emulate-nested.c index b7f3d86a94031..625604019fb32 100644 --- a/arch/arm64/kvm/emulate-nested.c +++ b/arch/arm64/kvm/emulate-nested.c @@ -136,6 +136,8 @@ enum cgt_group_id { CGT_CPTR_TTA, CGT_MDCR_HPMN, + CGT_HCR_NV_HCRX_nNVTGE, + /* Must be last */ __NR_CGT_GROUP_IDS__ }; @@ -588,6 +590,15 @@ static enum trap_behaviour check_mdcr_hpmn(struct kvm_vcpu *vcpu) return BEHAVE_HANDLE_LOCALLY; } +static enum trap_behaviour check_hcr_nv_hcrx_nnvtge(struct kvm_vcpu *vcpu) +{ + if ((__vcpu_sys_reg(vcpu, HCR_EL2) & HCR_EL2_NV) && + !(__vcpu_sys_reg(vcpu, HCRX_EL2) & HCRX_EL2_NVTGE)) + return BEHAVE_FORWARD_RW; + + return BEHAVE_HANDLE_LOCALLY; +} + #define CCC(id, fn) \ [id - __COMPLEX_CONDITIONS__] = fn @@ -598,6 +609,7 @@ static const complex_condition_check ccc[] = { CCC(CGT_CNTHCTL_EL1NVVCT, check_cnthctl_el1nvvct), CCC(CGT_CPTR_TTA, check_cptr_tta), CCC(CGT_MDCR_HPMN, check_mdcr_hpmn), + CCC(CGT_HCR_NV_HCRX_nNVTGE, check_hcr_nv_hcrx_nnvtge), }; /* @@ -853,6 +865,7 @@ static const struct encoding_to_trap_config encoding_to_cgt[] __initconst = { SR_TRAP(SYS_SCTLR2_EL2, CGT_HCR_NV), SR_RANGE_TRAP(SYS_HCR_EL2, SYS_HCRX_EL2, CGT_HCR_NV), + SR_TRAP(SYS_NVHCR_EL2, CGT_HCR_NV_HCRX_nNVTGE), SR_TRAP(SYS_SMPRIMAP_EL2, CGT_HCR_NV), SR_TRAP(SYS_SMCR_EL2, CGT_HCR_NV), SR_RANGE_TRAP(SYS_TTBR0_EL2, -- 2.47.3