From patchwork Mon Mar 10 12:24:50 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 14009827 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 DCC52227EAE; Mon, 10 Mar 2025 12:25:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741609513; cv=none; b=XcOzbbG726Ja9D4coQFDn/77ITBH4bQ+Kvv7/ydvTK/ZCvSXXaq2NiOokiDLg5LCE8u7tBbMEBiptuITyHUYm9guyPCWOVLq69TZsKe/Vi/0an9dXvhSZUnR4T6eo89iAGRiFSagpDRqcNIMjociNNZNQe8hxSwetmz0G064Wlc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741609513; c=relaxed/simple; bh=ZD1y0xgxzq9f9Jo/IS2k524ME5JZt65ppnEfB//OQRw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=qJv9qCzrFe1MLJm1FjETR1q6MniioHtEQDbq79w3nAzyJ5Na/j1+I8pDUsGsOE81S9XFT6V7qL/e5k0+FZyfDQa+xn5hXTrcmndm8wiR4+D0mnWGwLdldXb7nuqu1XkJwhSMcmOlwr7fM1Q9ejWT38Nt/cImRXIwNsUnLLrsEOc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KdXfaTcv; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="KdXfaTcv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BBE1EC4CEF7; Mon, 10 Mar 2025 12:25:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741609513; bh=ZD1y0xgxzq9f9Jo/IS2k524ME5JZt65ppnEfB//OQRw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KdXfaTcvnr3wgA4J0AlNItmJ/J8Dx0y/I5wcxDwVuSfE2TOtXEq3pi93vgr3cdxm7 zPM+cDb3SvpwlN//TAIgbH79aUx8zfSI4xWl4Bfva4hhzCxGk+WeA4xuK05aUV53B0 HG+I29XUOnDY2Us/dykGu4e2Qhhq48233dEFH5o8eLGRR28woJgi/RuBMWHoSPT/92 KEgoOolhmdKSwfWbEb8E0JPDaEVIMLe+SF0BQXbRd4RPJcQqVu5F0nEzc3f74FVt6S LUaEoJSFxJCqYxK0nZ2BNNUr2XZyU/C7ZEJyByOpX+BTRZGyHX4/Ondm3P5YEJ6pv+ 4iauqUiOfgOMw== 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 1trcBz-00CAea-TO; Mon, 10 Mar 2025 12:25:11 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Mark Rutland , Fuad Tabba Subject: [PATCH v2 08/23] KVM: arm64: Plug FEAT_GCS handling Date: Mon, 10 Mar 2025 12:24:50 +0000 Message-Id: <20250310122505.2857610-9-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250310122505.2857610-1-maz@kernel.org> References: <20250310122505.2857610-1-maz@kernel.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, joey.gouly@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com, mark.rutland@arm.com, tabba@google.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false We don't seem to be handling the GCS-specific exception class. Handle it by delivering an UNDEF to the guest, and populate the relevant trap bits. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/handle_exit.c | 11 +++++++++++ arch/arm64/kvm/sys_regs.c | 8 ++++++++ 2 files changed, 19 insertions(+) diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index b2d11cd0447c1..bf08c44491b4a 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -294,6 +294,16 @@ static int handle_svc(struct kvm_vcpu *vcpu) return 1; } +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); + + kvm_inject_undefined(vcpu); + return 1; +} + static int handle_other(struct kvm_vcpu *vcpu) { bool is_l2 = vcpu_has_nv(vcpu) && !is_hyp_ctxt(vcpu); @@ -376,6 +386,7 @@ static exit_handle_fn arm_exit_handlers[] = { [ESR_ELx_EC_BRK64] = kvm_handle_guest_debug, [ESR_ELx_EC_FP_ASIMD] = kvm_handle_fpasimd, [ESR_ELx_EC_PAC] = kvm_handle_ptrauth, + [ESR_ELx_EC_GCS] = kvm_handle_gcs, }; static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 18721c773475d..2ecd0d51a2dae 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -5056,6 +5056,14 @@ void kvm_calculate_traps(struct kvm_vcpu *vcpu) HFGITR_EL2_nBRBIALL); } + if (!kvm_has_feat(kvm, ID_AA64PFR1_EL1, GCS, IMP)) { + kvm->arch.fgu[HFGxTR_GROUP] |= (HFGxTR_EL2_nGCS_EL0 | + HFGxTR_EL2_nGCS_EL1); + kvm->arch.fgu[HFGITR_GROUP] |= (HFGITR_EL2_nGCSPUSHM_EL1 | + HFGITR_EL2_nGCSSTR_EL1 | + HFGITR_EL2_nGCSEPP); + } + set_bit(KVM_ARCH_FLAG_FGU_INITIALIZED, &kvm->arch.flags); out: mutex_unlock(&kvm->arch.config_lock);