qemu/accel/kvm
Shannon Zhao 6c090d4a75 kvm: Delete the slot if and only if the KVM_MEM_READONLY flag is changed
According to KVM commit 75d61fbc, it needs to delete the slot before
changing the KVM_MEM_READONLY flag. But QEMU commit 235e8982 only check
whether KVM_MEM_READONLY flag is set instead of changing. It doesn't
need to delete the slot if the KVM_MEM_READONLY flag is not changed.

This fixes a issue that migrating a VM at the OVMF startup stage and
VM is executing the codes in rom. Between the deleting and adding the
slot in kvm_set_user_memory_region, there is a chance that guest access
rom and trap to KVM, then KVM can't find the corresponding memslot.
While KVM (on ARM) injects an abort to guest due to the broken hva, then
guest will get stuck.

Signed-off-by: Shannon Zhao <zhaoshenglong@huawei.com>
Message-Id: <1526462314-19720-1-git-send-email-zhaoshenglong@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-06-28 19:05:31 +02:00
..
kvm-all.c kvm: Delete the slot if and only if the KVM_MEM_READONLY flag is changed 2018-06-28 19:05:31 +02:00
Makefile.objs kvm: add memory encryption context 2018-03-13 12:04:03 +01:00
sev-stub.c kvm: introduce memory encryption APIs 2018-03-13 12:04:03 +01:00
trace-events kvm: Add kvm_set_user_memory tracepoint 2018-02-05 13:54:38 +01:00