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kvm/memory: Make memory type private by default if it has guest memfd backend

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KVM side leaves the memory to shared by default, which 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 <xiaoyao.li@intel.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Message-ID: <20240320083945.991426-16-michael.roth@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2024-03-20 03:39:11 -05:00 committed by Paolo Bonzini
parent ce5a983233
commit bd3bcf6962
1 changed files with 10 additions and 0 deletions
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10
accel/kvm/kvm-all.c
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@ -1431,6 +1431,16 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml,
strerror(-err));
abort();
}
if (memory_region_has_guest_memfd(mr)) {
err = kvm_set_memory_attributes_private(start_addr, slot_size);
if (err) {
error_report("%s: failed to set memory attribute private: %s",
__func__, strerror(-err));
exit(1);
}
}
start_addr += slot_size;
ram_start_offset += slot_size;
ram += slot_size;