linux-kernel - [RFC PATCH 11/13] kvm: register private memory slots

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Date:   Thu, 11 Nov 2021 22:13:50 +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 PATCH 11/13] kvm: register private memory slots

Signed-off-by: Chao Peng <chao.p.peng@...ux.intel.com>
---
 accel/kvm/kvm-all.c      | 9 +++++++++
 include/sysemu/kvm_int.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 0125c17edb..d336458e9e 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -138,6 +138,7 @@ struct KVMState
     QTAILQ_HEAD(, KVMMSIRoute) msi_hashtab[KVM_MSI_HASHTAB_SIZE];
 #endif
     KVMMemoryListener memory_listener;
+    KVMMemoryListener private_memory_listener;
     QLIST_HEAD(, KVMParkedVcpu) kvm_parked_vcpus;
 
     /* For "info mtree -f" to tell if an MR is registered in KVM */
@@ -359,6 +360,7 @@ static int kvm_set_user_memory_region(KVMMemoryListener *kml, KVMSlot *slot, boo
     mem.guest_phys_addr = slot->start_addr;
     mem.userspace_addr = (unsigned long)slot->ram;
     mem.flags = slot->flags;
+    mem.fd = slot->fd;
 
     if (slot->memory_size && !new && (mem.flags ^ slot->old_flags) & KVM_MEM_READONLY) {
         /* Set the slot size to 0 before setting the slot to the desired
@@ -1423,6 +1425,9 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml,
         mem->ram_start_offset = ram_start_offset;
         mem->ram = ram;
         mem->flags = kvm_mem_flags(mr);
+        if (mr->ram_block) {
+            mem->fd = mr->ram_block->fd;
+        }
         kvm_slot_init_dirty_bitmap(mem);
         err = kvm_set_user_memory_region(kml, mem, true);
         if (err) {
@@ -2580,6 +2585,9 @@ static int kvm_init(MachineState *ms)
 
     kvm_memory_listener_register(s, &s->memory_listener,
                                  &address_space_memory, 0);
+    kvm_memory_listener_register(s, &s->private_memory_listener,
+                                 &address_space_private_memory, 2);
+
     if (kvm_eventfds_allowed) {
         memory_listener_register(&kvm_io_listener,
                                  &address_space_io);
@@ -2613,6 +2621,7 @@ err:
         close(s->fd);
     }
     g_free(s->memory_listener.slots);
+    g_free(s->private_memory_listener.slots);
 
     return ret;
 }
diff --git a/include/sysemu/kvm_int.h b/include/sysemu/kvm_int.h
index c788452cd9..0c11c63263 100644
--- a/include/sysemu/kvm_int.h
+++ b/include/sysemu/kvm_int.h
@@ -28,6 +28,7 @@ typedef struct KVMSlot
     int as_id;
     /* Cache of the offset in ram address space */
     ram_addr_t ram_start_offset;
+    int fd;
 } KVMSlot;
 
 typedef struct KVMMemoryListener {
-- 
2.17.1