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charset="utf-8" From: Xiaoyao Li KVM side leaves the memory to shared by default, while may incur the overhead of paging conversion on the first visit of each page. Because the expectation is that page is likely to private for the VMs that require private memory (has guest memfd). Explicitly set the memory to private when memory region has valid guest memfd backend. Signed-off-by: Xiaoyao Li Signed-off-by: Michael Roth --- accel/kvm/kvm-all.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 9a8b365a69..53ce4f091e 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -1451,6 +1451,16 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml, strerror(-err)); abort(); } + + if (memory_region_has_guest_memfd(mr)) { + err =3D kvm_set_memory_attributes_private(start_addr, slot_siz= e); + if (err) { + error_report("%s: failed to set memory attribute private: = %s\n", + __func__, strerror(-err)); + exit(1); + } + } + start_addr +=3D slot_size; ram_start_offset +=3D slot_size; ram +=3D slot_size; --=20 2.25.1