From patchwork Wed Oct 9 19:00:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 13829188 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1F4BFCEE345 for ; Wed, 9 Oct 2024 20:10:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=zqISrRXha6dSZL8HjHpXJAPtu8HouhGprMPsFki3RbI=; b=PUNu81ikf/DUx5+gWSzn2FzANO 8SMeftRDFYSrCwT97lKr+cGpcW+fgcdqBLDuodkPE7qkycHbsOaErVafEYOn0bemCdOAAS2Lbl4Ku oxOA0zJwNtNmFQQMuepNMqdWxGUcwV/ijhkf4wXa7MbA+ffGi5GYhRYQ6IspQlRHfz+TD1v9p2FRv ayU95ICOrUuYxUw8gUM+ipXpR5gjZ2kMho3I9N/R/nZJLPsaMaREZ7SbVJR3yvii/uaxcIgKvPoN5 2u+85KRGp3BjAnl/hwq/2ePEA61rzitA56mazkHVNMI+IJDN2Of9+5MHWsKesP+Wig77sNW708dlq MHItBIaw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1syd0b-0000000AZuV-0Zwx; Wed, 09 Oct 2024 20:10:09 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1sybvW-0000000ARH7-24r7 for linux-arm-kernel@lists.infradead.org; Wed, 09 Oct 2024 19:00:57 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id E75855C5D30; Wed, 9 Oct 2024 19:00:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9DD71C4CEE5; Wed, 9 Oct 2024 19:00:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728500446; bh=t5+ESdUFFUdCGyZIUjbqtV8WtvkmdsB4SAcVKjsOytc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=We14Ac1BBvnduVnRmzzSPQaa9LIwcKdDZWuY9Gw6S7+gYadlW4GEob73zRLmagQ2Z SztNmF4SePXXf2FDjighHYO+RSpCTPZgM4oHUx76cM20atLSImk5s/5OzXy7nHpJzp lXoCzxs4KR+OphFwEptm2LUx/Fei/nTV8PI85kdHgzkWwjXlxrRUEfCCzQq5yvXpkp A50li2UxWYVn5LSO7N3xEyPLQN1wMv2TCef5rEabecftNKNP/W5J9+t+iuYqHK4JNA Dcm5wDI6hNj6qH/rda40n7ZJeePXG31GcNLMoJgwjuZxCOyfAFvKB7eKqYGTGJOzBR a6GGvmcscwWMw== 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 4.95) (envelope-from ) id 1sybvQ-001wcY-Qj; Wed, 09 Oct 2024 20:00:44 +0100 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Alexandru Elisei , Mark Brown Subject: [PATCH v4 20/36] KVM: arm64: Disable hierarchical permissions when S1PIE is enabled Date: Wed, 9 Oct 2024 20:00:03 +0100 Message-Id: <20241009190019.3222687-21-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20241009190019.3222687-1-maz@kernel.org> References: <20241009190019.3222687-1-maz@kernel.org> MIME-Version: 1.0 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, joey.gouly@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com, alexandru.elisei@arm.com, broonie@kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241009_120050_811908_DF32558D X-CRM114-Status: GOOD ( 11.97 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org S1PIE implicitly disables hierarchical permissions, as specified in R_JHSVW, by making TCR_ELx.HPDn RES1. Add a predicate for S1PIE being enabled for a given translation regime, and emulate this behaviour by forcing the hpd field to true if S1PIE is enabled for that translation regime. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/at.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/arm64/kvm/at.c b/arch/arm64/kvm/at.c index adcfce3f67f03..f5bd750288ff5 100644 --- a/arch/arm64/kvm/at.c +++ b/arch/arm64/kvm/at.c @@ -93,6 +93,23 @@ static enum trans_regime compute_translation_regime(struct kvm_vcpu *vcpu, u32 o } } +static bool s1pie_enabled(struct kvm_vcpu *vcpu, enum trans_regime regime) +{ + if (!kvm_has_feat(vcpu->kvm, ID_AA64MMFR3_EL1, S1PIE, IMP)) + return false; + + switch (regime) { + case TR_EL2: + case TR_EL20: + return vcpu_read_sys_reg(vcpu, TCR2_EL2) & TCR2_EL2_PIE; + case TR_EL10: + return (__vcpu_sys_reg(vcpu, HCRX_EL2) & HCRX_EL2_TCR2En) && + (__vcpu_sys_reg(vcpu, TCR2_EL1) & TCR2_EL1x_PIE); + default: + BUG(); + } +} + static int setup_s1_walk(struct kvm_vcpu *vcpu, u32 op, struct s1_walk_info *wi, struct s1_walk_result *wr, u64 va) { @@ -186,6 +203,8 @@ static int setup_s1_walk(struct kvm_vcpu *vcpu, u32 op, struct s1_walk_info *wi, (va55 ? FIELD_GET(TCR_HPD1, tcr) : FIELD_GET(TCR_HPD0, tcr))); + /* R_JHSVW */ + wi->hpd |= s1pie_enabled(vcpu, wi->regime); /* Someone was silly enough to encode TG0/TG1 differently */ if (va55) {