From patchwork Mon Nov 11 10:27:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Orlov X-Patchwork-Id: 13870504 Received: from smtp-fw-2101.amazon.com (smtp-fw-2101.amazon.com [72.21.196.25]) (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 E86761946CF; Mon, 11 Nov 2024 10:28:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=72.21.196.25 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731320896; cv=none; b=dz1JGcWUDm8ro4J2m0gMHs0BjrZP9m9NNFrSFvniteQMFi1ND7c5Q4VdWC8BmsdAQ2bysnZZY9Jotek/XfF+VydLPWqeo2t2ZChUmnaytY63bzFh4UAUM55x4rsoWXuTdzAluwUC2+8cw1ilmS+KLJ73oqJikZhHVKNsZO7mIFM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731320896; c=relaxed/simple; bh=ld2htNMH0wPiH0yxfy3DynYM6vkDFeKlfvMRDP8V8sM=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=WRFlDHmKc08ZD4PVqYluaRdbhSqDzddsZFQZyEUb68TnyL+fkls7M/wI7smYGdLBwy9UCpvYf/6y75bkjepF+kzRLO3YepoAxEAUC0t/VmEKZ79x/10Z767gu0smzc4OwaLtOUDzpY6xVCdtSV7yN1IxcuUSb1GRRwF1xL5Dxgk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com; spf=pass smtp.mailfrom=amazon.co.uk; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b=V173LC85; arc=none smtp.client-ip=72.21.196.25 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.co.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="V173LC85" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1731320895; x=1762856895; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ssZRDwUFYvqJoo1dkCRAk/I8OZ5DCMExWyKykGpw3fw=; b=V173LC85Ld6MJ8D9Ry48jalfF5u2K2Ru0Tipdvh3jJqVsrbwbHMpuP5U McJdN1QVe1AZQaxboGXnOyx1l+rYnT3jVuNrWKEFAqMAMeZNIj1Q9twl/ t4uza4QXrvo/WTYkhwitT1kIM6nQyxkjacfKrr5oZsSrhX1tk587DgRme I=; X-IronPort-AV: E=Sophos;i="6.12,144,1728950400"; d="scan'208";a="441674387" Received: from iad6-co-svc-p1-lb1-vlan3.amazon.com (HELO smtpout.prod.us-east-1.prod.farcaster.email.amazon.dev) ([10.124.125.6]) by smtp-border-fw-2101.iad2.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Nov 2024 10:28:14 +0000 Received: from EX19MTAUEA002.ant.amazon.com [10.0.0.204:45389] by smtpin.naws.us-east-1.prod.farcaster.email.amazon.dev [10.0.26.144:2525] with esmtp (Farcaster) id c672870c-d482-4391-913e-d42e6c81d821; Mon, 11 Nov 2024 10:28:13 +0000 (UTC) X-Farcaster-Flow-ID: c672870c-d482-4391-913e-d42e6c81d821 Received: from EX19D008UEA004.ant.amazon.com (10.252.134.191) by EX19MTAUEA002.ant.amazon.com (10.252.134.9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34; Mon, 11 Nov 2024 10:28:08 +0000 Received: from EX19MTAUWC002.ant.amazon.com (10.250.64.143) by EX19D008UEA004.ant.amazon.com (10.252.134.191) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34; Mon, 11 Nov 2024 10:28:08 +0000 Received: from email-imr-corp-prod-iad-all-1b-3ae3de11.us-east-1.amazon.com (10.25.36.210) by mail-relay.amazon.com (10.250.64.149) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34 via Frontend Transport; Mon, 11 Nov 2024 10:28:07 +0000 Received: from dev-dsk-iorlov-1b-d2eae488.eu-west-1.amazon.com (dev-dsk-iorlov-1b-d2eae488.eu-west-1.amazon.com [10.253.74.38]) by email-imr-corp-prod-iad-all-1b-3ae3de11.us-east-1.amazon.com (Postfix) with ESMTPS id 9F7EBA04F9; Mon, 11 Nov 2024 10:28:05 +0000 (UTC) From: Ivan Orlov To: , , , , , , CC: Ivan Orlov , , , , , , , Subject: [PATCH v2 4/6] KVM: SVM: Handle MMIO during vectroing error Date: Mon, 11 Nov 2024 10:27:47 +0000 Message-ID: <20241111102749.82761-5-iorlov@amazon.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20241111102749.82761-1-iorlov@amazon.com> References: <20241111102749.82761-1-iorlov@amazon.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Handle MMIO during vectoring error in check_emulate_instruction to prevent infinite loop on SVM and eliminate the difference in how the situation when the guest accesses MMIO during vectoring is handled on SVM and VMX. Signed-off-by: Ivan Orlov --- V1 -> V2: - Detect the unhandleable vectoring error in svm_check_emulate_instruction instead of handling it in the common MMU code (which is specific for cached MMIO) arch/x86/kvm/svm/svm.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index c1e29307826b..b69f0f98c576 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -4797,9 +4797,16 @@ static void svm_enable_smi_window(struct kvm_vcpu *vcpu) static int svm_check_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type, void *insn, int insn_len) { - bool smep, smap, is_user; + bool smep, smap, is_user, is_vect; u64 error_code; + is_vect = to_svm(vcpu)->vmcb->control.exit_int_info & + SVM_EXITINTINFO_TYPE_MASK; + + /* Emulation is not possible when MMIO happens during event vectoring. */ + if (kvm_is_emul_type_mmio(emul_type) && is_vect) + return X86EMUL_UNHANDLEABLE_VECTORING_IO; + /* Emulation is always possible when KVM has access to all guest state. */ if (!sev_guest(vcpu->kvm)) return X86EMUL_CONTINUE;