From patchwork Tue Dec 17 18:14:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Orlov X-Patchwork-Id: 851560 Received: from smtp-fw-52002.amazon.com (smtp-fw-52002.amazon.com [52.119.213.150]) (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 83AC31F8926; Tue, 17 Dec 2024 18:15:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=52.119.213.150 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734459323; cv=none; b=CC1IA12GJQaHD2374KElojAhnZ2I/RDe19FLX+U6xWtQRPHXN+LguKAbkudWHdN4rSxLwWSDpB4Jcn14Gy80XV51AQePLtXZjfCXyiLpQYOPORpfaliXwN6dANSESPnOdQLJNvSBgVFnmIYB6oOKupbSxFk0bc7yFRkQGmQRU+o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734459323; c=relaxed/simple; bh=BlFiVRX84VKB+lYW0JlENh5OHc/YiO1YD8ZW2XFsitY=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=XYSdiBr2n5mjP7p+nwwJgzOm5joC9AJSV56n0F3VziC6eFGqZLqpvSb2YAjDzgW25KWfMuSvJkyXZPlG3IYbwo7VRax0szwSvkRmhdDXeVmI5tuT3Gb6bcprYAG4YKwVP0gCFgHNxuHpOG230hyxin7PFOXPKsx88Q74JACNEJk= 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=SO9mURks; arc=none smtp.client-ip=52.119.213.150 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="SO9mURks" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1734459321; x=1765995321; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=6Bb3yk5m8+2ssI3UJ2EET3EK/UrkVfIMo+0kcIuYef0=; b=SO9mURksLHEZ2EOElVjKX1wjJjnYEFQrC6GitprwmlGqhEpMRZaRwAfH 83B7qScdvLQYNgiOdkSMd6a+eVOzrnCICS6c0fppIgItNz3V+bRC41oXR BqsG8w5O4e3cl79x/v9Srz9IvMjDrXOQ+rYXPZhDVwgvM0205z4s39saM I=; X-IronPort-AV: E=Sophos;i="6.12,242,1728950400"; d="scan'208";a="682125540" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO smtpout.prod.us-east-1.prod.farcaster.email.amazon.dev) ([10.43.8.6]) by smtp-border-fw-52002.iad7.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Dec 2024 18:15:18 +0000 Received: from EX19MTAUEC002.ant.amazon.com [10.0.29.78:60145] by smtpin.naws.us-east-1.prod.farcaster.email.amazon.dev [10.0.36.121:2525] with esmtp (Farcaster) id 365cb594-0db9-4605-a381-469b8f367db5; Tue, 17 Dec 2024 18:15:18 +0000 (UTC) X-Farcaster-Flow-ID: 365cb594-0db9-4605-a381-469b8f367db5 Received: from EX19D008UEA003.ant.amazon.com (10.252.134.116) by EX19MTAUEC002.ant.amazon.com (10.252.135.253) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.39; Tue, 17 Dec 2024 18:15:18 +0000 Received: from EX19MTAUEB002.ant.amazon.com (10.252.135.47) by EX19D008UEA003.ant.amazon.com (10.252.134.116) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.39; Tue, 17 Dec 2024 18:15:18 +0000 Received: from email-imr-corp-prod-pdx-1box-2b-8c2c6aed.us-west-2.amazon.com (10.43.8.2) by mail-relay.amazon.com (10.252.135.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.39 via Frontend Transport; Tue, 17 Dec 2024 18:15:18 +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-pdx-1box-2b-8c2c6aed.us-west-2.amazon.com (Postfix) with ESMTPS id 7FA39A0790; Tue, 17 Dec 2024 18:15:15 +0000 (UTC) From: Ivan Orlov To: , , , , , , CC: Ivan Orlov , , , , , , , , Subject: [PATCH v3 5/7] KVM: SVM: Handle vectoring error in check_emulate_instruction Date: Tue, 17 Dec 2024 18:14:56 +0000 Message-ID: <20241217181458.68690-6-iorlov@amazon.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20241217181458.68690-1-iorlov@amazon.com> References: <20241217181458.68690-1-iorlov@amazon.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Detect unhandleable vectoring in check_emulate_instruction to prevent infinite loop on SVM and eliminate the difference in how intercepted #PF 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) V2 -> V3: - Use more generic function to check if emulation is allowed when vectoring arch/x86/kvm/svm/svm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index dd15cc635655..e89c6fc2c4e6 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -4802,6 +4802,12 @@ static int svm_check_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type, bool smep, smap, is_user; u64 error_code; + /* Check that emulation is possible during event vectoring */ + if ((to_svm(vcpu)->vmcb->control.exit_int_info & + SVM_EXITINTINFO_TYPE_MASK) && + !kvm_can_emulate_event_vectoring(emul_type)) + return X86EMUL_UNHANDLEABLE_VECTORING; + /* Emulation is always possible when KVM has access to all guest state. */ if (!sev_guest(vcpu->kvm)) return X86EMUL_CONTINUE;