From patchwork Wed Oct 23 14:53:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 13847295 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 58CD6D2C56C for ; Wed, 23 Oct 2024 15:33:06 +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=OiHU+RGzzr4QpQkTFm33dPeV4vASMP8CImMEmnlICDk=; b=j3vFTtvv3K8VtM4i/DCPF8KIEN ZdoK3wlWRFsb/HfOzABoLjos6N+JXxStwiBYt95ZaNXBZvZ5eqfUWEzM0jlM/raoxmwcmMsGzzi73 TqHP8B/dLpbfMLftB5FfyEDHai5bOUrEnSskMNoPFeMt2ew41YIPXhnJDhRLZ0teDK0T4o3RkJU6V Wao+gajl5izaKPuell9ysYr74GEsN6O4S4N9YL1GSZJzbA5xdL9ZwfcZ29Wl2/itdGLyGwvJXpqnJ vWc/yQgUMp6ZgRi2Ch/7W2gqgJjVGzmuh3NfUvHoxnB/UXGDHZLbAPiG/2M5LunsHVnIvuA7Sao+T q1wsHHPg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t3dLx-0000000EyVz-0osd; Wed, 23 Oct 2024 15:32:53 +0000 Received: from nyc.source.kernel.org ([147.75.193.91]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t3ckK-0000000EpJL-1Xie for linux-arm-kernel@lists.infradead.org; Wed, 23 Oct 2024 14:54:05 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 95561A45040; Wed, 23 Oct 2024 14:53:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 96600C4CECD; Wed, 23 Oct 2024 14:53:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729695235; bh=LYdBETnn2M88/sr9XD6Wu4WwdOew9iodz0Dr8K47paA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CB3D9WZwyVqUkgAk6CJ0EmYhuneyYy+AN+Rm4VE3DukctgyrCmv4P4k2wErFNzI7P 9BGIz96t3aFMmU8aSNsxNN+8pMrPONEeNR/WP/MPP9mnOjQ4cNNug3yHIFLaDKX4yj R3O3pSEbkRVoIDYr5dkaJrt80GoR/oqD/nuEw4qd/EOS2DIGnj7PdtljFLuQothzid 7/9/rIr+z3B4DohK0aQENLBGS2lMWx0HmuNpRFwS3oXXnTXtWnTaAj2YrEHW0f2iYb M+ux05CnhqZOQAKiLrD9IQjBLEAL7WXr5N9H7JxixX/S+4+S7EZvpS1ZK8aXB8dUBq EcP2q6K/a5LDw== 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 1t3ckD-0068vz-RV; Wed, 23 Oct 2024 15:53:53 +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 v5 21/37] KVM: arm64: Implement AT S1PIE support Date: Wed, 23 Oct 2024 15:53:29 +0100 Message-Id: <20241023145345.1613824-22-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20241023145345.1613824-1-maz@kernel.org> References: <20241023145345.1613824-1-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-20241023_075400_791573_7FD510D3 X-CRM114-Status: GOOD ( 16.72 ) 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 It doesn't take much effort to implement S1PIE support in AT. It is only a matter of using the AArch64.S1IndirectBasePermissions() encodings for the permission, ignoring GCS which has no impact on AT, and enforce FEAT_PAN3 being enabled as this is a requirement of FEAT_S1PIE. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/at.c | 117 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 116 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/at.c b/arch/arm64/kvm/at.c index f5bd750288ff5..3d93ed1795603 100644 --- a/arch/arm64/kvm/at.c +++ b/arch/arm64/kvm/at.c @@ -781,6 +781,9 @@ static bool pan3_enabled(struct kvm_vcpu *vcpu, enum trans_regime regime) if (!kvm_has_feat(vcpu->kvm, ID_AA64MMFR1_EL1, PAN, PAN3)) return false; + if (s1pie_enabled(vcpu, regime)) + return true; + if (regime == TR_EL10) sctlr = vcpu_read_sys_reg(vcpu, SCTLR_EL1); else @@ -862,11 +865,123 @@ static void compute_s1_hierarchical_permissions(struct kvm_vcpu *vcpu, } } +#define perm_idx(v, r, i) ((vcpu_read_sys_reg((v), (r)) >> ((i) * 4)) & 0xf) + +#define set_priv_perms(wr, r, w, x) \ + do { \ + (wr)->pr = (r); \ + (wr)->pw = (w); \ + (wr)->px = (x); \ + } while (0) + +#define set_unpriv_perms(wr, r, w, x) \ + do { \ + (wr)->ur = (r); \ + (wr)->uw = (w); \ + (wr)->ux = (x); \ + } while (0) + +/* Similar to AArch64.S1IndirectBasePermissions(), without GCS */ +#define set_perms(w, wr, ip) \ + do { \ + /* R_LLZDZ */ \ + switch ((ip)) { \ + case 0b0000: \ + set_ ## w ## _perms((wr), false, false, false); \ + break; \ + case 0b0001: \ + set_ ## w ## _perms((wr), true , false, false); \ + break; \ + case 0b0010: \ + set_ ## w ## _perms((wr), false, false, true ); \ + break; \ + case 0b0011: \ + set_ ## w ## _perms((wr), true , false, true ); \ + break; \ + case 0b0100: \ + set_ ## w ## _perms((wr), false, false, false); \ + break; \ + case 0b0101: \ + set_ ## w ## _perms((wr), true , true , false); \ + break; \ + case 0b0110: \ + set_ ## w ## _perms((wr), true , true , true ); \ + break; \ + case 0b0111: \ + set_ ## w ## _perms((wr), true , true , true ); \ + break; \ + case 0b1000: \ + set_ ## w ## _perms((wr), true , false, false); \ + break; \ + case 0b1001: \ + set_ ## w ## _perms((wr), true , false, false); \ + break; \ + case 0b1010: \ + set_ ## w ## _perms((wr), true , false, true ); \ + break; \ + case 0b1011: \ + set_ ## w ## _perms((wr), false, false, false); \ + break; \ + case 0b1100: \ + set_ ## w ## _perms((wr), true , true , false); \ + break; \ + case 0b1101: \ + set_ ## w ## _perms((wr), false, false, false); \ + break; \ + case 0b1110: \ + set_ ## w ## _perms((wr), true , true , true ); \ + break; \ + case 0b1111: \ + set_ ## w ## _perms((wr), false, false, false); \ + break; \ + } \ + } while (0) + +static void compute_s1_indirect_permissions(struct kvm_vcpu *vcpu, + struct s1_walk_info *wi, + struct s1_walk_result *wr) +{ + u8 up, pp, idx; + + idx = pte_pi_index(wr->desc); + + switch (wi->regime) { + case TR_EL10: + pp = perm_idx(vcpu, PIR_EL1, idx); + up = perm_idx(vcpu, PIRE0_EL1, idx); + break; + case TR_EL20: + pp = perm_idx(vcpu, PIR_EL2, idx); + up = perm_idx(vcpu, PIRE0_EL2, idx); + break; + case TR_EL2: + pp = perm_idx(vcpu, PIR_EL2, idx); + up = 0; + break; + } + + set_perms(priv, wr, pp); + + if (wi->regime != TR_EL2) + set_perms(unpriv, wr, up); + else + set_unpriv_perms(wr, false, false, false); + + /* R_VFPJF */ + if (wr->px && wr->uw) { + set_priv_perms(wr, false, false, false); + set_unpriv_perms(wr, false, false, false); + } +} + static void compute_s1_permissions(struct kvm_vcpu *vcpu, u32 op, struct s1_walk_info *wi, struct s1_walk_result *wr) { - compute_s1_direct_permissions(vcpu, wi, wr); + if (!s1pie_enabled(vcpu, wi->regime)) + compute_s1_direct_permissions(vcpu, wi, wr); + else + compute_s1_indirect_permissions(vcpu, wi, wr); if (!wi->hpd) compute_s1_hierarchical_permissions(vcpu, wi, wr);