From nobody Mon Feb 9 04:46:12 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail header.i=@intel.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=linux.intel.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1640100736611882.2323814551289; Tue, 21 Dec 2021 07:32:16 -0800 (PST) Received: from localhost ([::1]:50510 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mzh7f-0000c1-IZ for importer@patchew.org; Tue, 21 Dec 2021 10:32:15 -0500 Received: from eggs.gnu.org ([209.51.188.92]:46298) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mzgpm-0000df-Pu for qemu-devel@nongnu.org; Tue, 21 Dec 2021 10:13:46 -0500 Received: from mga05.intel.com ([192.55.52.43]:21424) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mzgpj-0008M0-6x for qemu-devel@nongnu.org; Tue, 21 Dec 2021 10:13:46 -0500 Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Dec 2021 07:13:40 -0800 Received: from chaop.bj.intel.com ([10.240.192.101]) by orsmga005.jf.intel.com with ESMTP; 21 Dec 2021 07:13:33 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1640099623; x=1671635623; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=GpzaY/v5Xy0pX72fyoYUfRrCzZUdqzkwMBDdLOr36fk=; b=JhtuZDxUhFLym4pFmWPk6pRnTzqO4azkJez8h0DjXBNJBh7VgShXHADR e73j9RnLrvfSBsmrpd+2saNrNJcN6eOECZsNdAj+ioORBgz/Z/LijYGHg CpmE8zODe+R6gciNsBlnQCT6Ub+5ds/+lLXh8gWiEi153W75Tk1OAw9vM V+b9Qm7TlTSywPxduQrTd1wkpYx9veCCEVjcLb4nG0elP4mJ+93SgOiiD fFlx9B+aOYbOtMi2XGqNgSQ97EaMPsebN5CVoZB/kanmU4hXp/7V8tJ24 MgLwlM/ELTRWN3Gl2aBOZ92Uh7tGhf0nkptUvzj93Blk/ZRDK53XtCLj1 w==; X-IronPort-AV: E=McAfee;i="6200,9189,10204"; a="326709936" X-IronPort-AV: E=Sophos;i="5.88,223,1635231600"; d="scan'208";a="326709936" X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,223,1635231600"; d="scan'208";a="684688608" From: Chao Peng To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, qemu-devel@nongnu.org Subject: [PATCH v3 12/15] KVM: Add KVM_EXIT_MEMORY_ERROR exit Date: Tue, 21 Dec 2021 23:11:22 +0800 Message-Id: <20211221151125.19446-13-chao.p.peng@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211221151125.19446-1-chao.p.peng@linux.intel.com> References: <20211221151125.19446-1-chao.p.peng@linux.intel.com> Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=192.55.52.43; envelope-from=chao.p.peng@linux.intel.com; helo=mga05.intel.com X-Spam_score_int: -44 X-Spam_score: -4.5 X-Spam_bar: ---- X-Spam_report: (-4.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.203, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Wanpeng Li , jun.nakajima@intel.com, david@redhat.com, "J . Bruce Fields" , dave.hansen@intel.com, "H . Peter Anvin" , Chao Peng , ak@linux.intel.com, Jonathan Corbet , Joerg Roedel , x86@kernel.org, Hugh Dickins , Ingo Molnar , Borislav Petkov , luto@kernel.org, Thomas Gleixner , Vitaly Kuznetsov , Jim Mattson , Sean Christopherson , susie.li@intel.com, Jeff Layton , john.ji@intel.com, Yu Zhang , Paolo Bonzini , Andrew Morton , "Kirill A . Shutemov" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1640100737553100001 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This new exit allows user space to handle memory-related errors. Currently it supports two types (KVM_EXIT_MEM_MAP_SHARED/PRIVATE) of errors which are used for shared memory <-> private memory conversion in memory encryption usage. After private memory is enabled, there are two places in KVM that can exit to userspace to trigger private <-> shared conversion: - explicit conversion: happens when guest explicitly calls into KVM to map a range (as private or shared), KVM then exits to userspace to do the map/unmap operations. - implicit conversion: happens in KVM page fault handler. * if the fault is due to a private memory access then causes a userspace exit for a shared->private conversion request when the page has not been allocated in the private memory backend. * If the fault is due to a shared memory access then causes a userspace exit for a private->shared conversion request when the page has already been allocated in the private memory backend. Signed-off-by: Yu Zhang Signed-off-by: Chao Peng --- include/uapi/linux/kvm.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index a2c1fb8c9843..d0c2af431cd9 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -297,6 +297,18 @@ struct kvm_tdx_exit { } u; }; =20 +struct kvm_memory_exit { +#define KVM_EXIT_MEM_MAP_SHARED 1 +#define KVM_EXIT_MEM_MAP_PRIVATE 2 + __u32 type; + union { + struct { + __u64 gpa; + __u64 size; + } map; + } u; +}; + #define KVM_S390_GET_SKEYS_NONE 1 #define KVM_S390_SKEYS_MAX 1048576 =20 @@ -336,6 +348,7 @@ struct kvm_tdx_exit { #define KVM_EXIT_X86_BUS_LOCK 33 #define KVM_EXIT_XEN 34 #define KVM_EXIT_RISCV_SBI 35 +#define KVM_EXIT_MEMORY_ERROR 36 #define KVM_EXIT_TDX 50 /* dump number to avoid conflict. */ =20 /* For KVM_EXIT_INTERNAL_ERROR */ @@ -554,6 +567,8 @@ struct kvm_run { unsigned long args[6]; unsigned long ret[2]; } riscv_sbi; + /* KVM_EXIT_MEMORY_ERROR */ + struct kvm_memory_exit mem; /* KVM_EXIT_TDX_VMCALL */ struct kvm_tdx_exit tdx; /* Fix the size of the union. */ --=20 2.17.1