linux-kernel - [RFC v2 PATCH 02/13] KVM: Add KVM_EXIT_MEMORY

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Message-Id: <20211119134739.20218-3-chao.p.peng@linux.intel.com>
Date:   Fri, 19 Nov 2021 21:47:28 +0800
From:   Chao Peng <chao.p.peng@...ux.intel.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        qemu-devel@...gnu.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jeff Layton <jlayton@...nel.org>,
        "J . Bruce Fields" <bfields@...ldses.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        luto@...nel.org, john.ji@...el.com, susie.li@...el.com,
        jun.nakajima@...el.com, dave.hansen@...el.com, ak@...ux.intel.com,
        david@...hat.com
Subject: [RFC v2 PATCH 02/13] KVM: Add KVM_EXIT_MEMORY_ERROR exit

This new exit allows userspace to handle memory related error. It will
be used for shared memory <-->private memory conversion.

Signed-off-by: Yu Zhang <yu.c.zhang@...ux.intel.com>
Signed-off-by: Chao Peng <chao.p.peng@...ux.intel.com>
---
 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 7c93d61cb19e..7e3a8935534b 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -285,6 +285,18 @@ 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
 
@@ -324,6 +336,7 @@ 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 */
@@ -542,6 +555,8 @@ 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