From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 93CCFC433EF for ; Tue, 21 Dec 2021 15:13:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239199AbhLUPNu (ORCPT ); Tue, 21 Dec 2021 10:13:50 -0500 Received: from mga04.intel.com ([192.55.52.120]:9809 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239194AbhLUPNs (ORCPT ); Tue, 21 Dec 2021 10:13:48 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1640099628; x=1671635628; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=GpzaY/v5Xy0pX72fyoYUfRrCzZUdqzkwMBDdLOr36fk=; b=AOClHpN8r7SfhapRWaqu4ST6+dUkSIzO9rwXpPXUABSlK4VoPBK1N6AP 8hgtO+d26ADSbiFi8mn3hkHnZMKcMqD/aL+l6F4Q2m0g0/F6dpDTGs26p Q0uAemlmujWZCfpk2yGA1ZKQPGwPCnz2pCJ2yF0GJnXxGl3Z46Nq5Cyx4 ZwYGYnYFTCf2SOUGFlpY7c8kp2CN7QuWOemuKkixyk/hcYaEwOfM+NFiV +EN9itZ0F63015SJjZNKi4fDIizbx6plPCv60o26AupO3sHRe0PZluYFS wjMxSZYMu2vq2hEuYXfhLI5s9i7Bp3rR9uzw/XJRKpGHQF+EYs7BSqnvS Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10204"; a="239157806" X-IronPort-AV: E=Sophos;i="5.88,223,1635231600"; d="scan'208";a="239157806" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Dec 2021 07:13:40 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,223,1635231600"; d="scan'208";a="684688608" Received: from chaop.bj.intel.com ([10.240.192.101]) by orsmga005.jf.intel.com with ESMTP; 21 Dec 2021 07:13:33 -0800 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 Cc: Paolo Bonzini , Jonathan Corbet , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H . Peter Anvin" , Hugh Dickins , Jeff Layton , "J . Bruce Fields" , Andrew Morton , Yu Zhang , Chao Peng , "Kirill A . Shutemov" , luto@kernel.org, john.ji@intel.com, susie.li@intel.com, jun.nakajima@intel.com, dave.hansen@intel.com, ak@linux.intel.com, david@redhat.com 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> Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org 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; }; +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 @@ -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. */ /* 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. */ -- 2.17.1