From patchwork Sun Jan 12 17:08:40 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 13936496 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 AE804E77188 for ; Sun, 12 Jan 2025 17:24:13 +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=vLkOUnfvrMr56Ihfpy3Sfoqx94Fc1N1WgaqZqbK0Eu4=; b=2XbBkg7HzhQOIAp4Oqx2cq9syh Oze7osBmGhOASAON9eyX/M/r7TRa4ZoepayJXlYK9TtFYS1cNDDtIJJyO8y8TKDsnTKf0xWZKZN3R 2kKtRai8/4xUVeTGxmJHRAIeAcr7RslIhhzCehwHnwPT1YIPcJQDgZgIi9fpRGiP54DziHmW8J/4F D2I3CFWypvoR64FloqOWsACIdz7PgSk43liHbhmxCZLKE3a/KwJvtbtCHXYvDaPJz6xs77/33J4mc ewk7/vTMm0oscNp35JH8sgEeMF/GdLBl/bmeizXxv1oqYvDnoM52AmiNeJyoWHPEhRE32c/Ul1Dkr PdrckX+g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tX1gx-000000039ii-3b3Q; Sun, 12 Jan 2025 17:24:03 +0000 Received: from nyc.source.kernel.org ([2604:1380:45d1:ec00::3]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tX1SJ-000000037i3-2sbr for linux-arm-kernel@lists.infradead.org; Sun, 12 Jan 2025 17:08:57 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 31B05A40A6C; Sun, 12 Jan 2025 17:07:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5217DC4CEE6; Sun, 12 Jan 2025 17:08:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736701733; bh=yZevPphbLIaRcs4edJZitg1YrBi5XxHxu0Vy608/eXQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Nn7phORi2D2cdJrrCJ+J6XtT2kCIx/ox4PbjewvjK1uRkcpBRd+9/2hI4lyE5DBD+ hF0+YtYEPlfkOlmag5yRgNE/Ub2KZ5XUaJuFcZZzlBnZDg0RLhLVufnupE2OsIv9wV a05ymBZlYer07/uisCAd3hhfg5/sqywBiTEFpHO55hcC1A1FxPy0o/XL/zKvwXfEii EbY1PJWHlINaQG5K0PE/YJLNHQGeCtf3i5LESOzrp2o8/KqNkVW65CBcf+qm43e3xA y9mnaXMCLa6filTVH6z8oGjzbKmWTXRaZnfaIw7KmDHF1+x7ivyDw+Ld7j2RnXNkb1 /R/FWHJ37ZM7A== 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 1tX1SF-00BNxR-Et; Sun, 12 Jan 2025 17:08:51 +0000 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 , Andre Przywara , Eric Auger Subject: [PATCH v2 12/17] KVM: arm64: nv: Respect virtual HCR_EL2.TWx setting Date: Sun, 12 Jan 2025 17:08:40 +0000 Message-Id: <20250112170845.1181891-13-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250112170845.1181891-1-maz@kernel.org> References: <20250112170845.1181891-1-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, andre.przywara@arm.com, eric.auger@redhat.com 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-20250112_090855_859015_D05CB7C6 X-CRM114-Status: GOOD ( 12.83 ) 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 From: Jintack Lim Forward exceptions due to WFI or WFE instructions to the virtual EL2 if they are not coming from the virtual EL2 and virtual HCR_EL2.TWx is set. Signed-off-by: Jintack Lim Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/kvm_emulate.h | 13 +++++++++++++ arch/arm64/kvm/handle_exit.c | 6 +++++- 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h index cf811009a33c9..5d2af20f75890 100644 --- a/arch/arm64/include/asm/kvm_emulate.h +++ b/arch/arm64/include/asm/kvm_emulate.h @@ -281,6 +281,19 @@ static __always_inline u64 kvm_vcpu_get_esr(const struct kvm_vcpu *vcpu) return vcpu->arch.fault.esr_el2; } +static inline bool guest_hyp_wfx_traps_enabled(const struct kvm_vcpu *vcpu) +{ + u64 esr = kvm_vcpu_get_esr(vcpu); + bool is_wfe = !!(esr & ESR_ELx_WFx_ISS_WFE); + u64 hcr_el2 = __vcpu_sys_reg(vcpu, HCR_EL2); + + if (!vcpu_has_nv(vcpu) || vcpu_is_el2(vcpu)) + return false; + + return ((is_wfe && (hcr_el2 & HCR_TWE)) || + (!is_wfe && (hcr_el2 & HCR_TWI))); +} + static __always_inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu) { u64 esr = kvm_vcpu_get_esr(vcpu); diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index d7c2990e7c9ed..206eb6698db70 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -129,8 +129,12 @@ static int kvm_handle_fpasimd(struct kvm_vcpu *vcpu) static int kvm_handle_wfx(struct kvm_vcpu *vcpu) { u64 esr = kvm_vcpu_get_esr(vcpu); + bool is_wfe = !!(esr & ESR_ELx_WFx_ISS_WFE); - if (esr & ESR_ELx_WFx_ISS_WFE) { + if (guest_hyp_wfx_traps_enabled(vcpu)) + return kvm_inject_nested_sync(vcpu, kvm_vcpu_get_esr(vcpu)); + + if (is_wfe) { trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true); vcpu->stat.wfe_exit_stat++; } else {