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

From: Chao Peng <chao.p.peng@linux.intel.com>
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 <pbonzini@redhat.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
	Hugh Dickins <hughd@google.com>, Jeff Layton <jlayton@kernel.org>,
	"J . Bruce Fields" <bfields@fieldses.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Yu Zhang <yu.c.zhang@linux.intel.com>,
	Chao Peng <chao.p.peng@linux.intel.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	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: [RFC PATCH 11/13] kvm: register private memory slots
Date: Thu, 11 Nov 2021 22:13:50 +0800	[thread overview]
Message-ID: <20211111141352.26311-12-chao.p.peng@linux.intel.com> (raw)
In-Reply-To: <20211111141352.26311-1-chao.p.peng@linux.intel.com>

Signed-off-by: Chao Peng <chao.p.peng@linux.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

