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KVM: set_memory_region: Disallow changing read-only attribute later
As Xiao pointed out, there are a few problems with it: - kvm_arch_commit_memory_region() write protects the memory slot only for GET_DIRTY_LOG when modifying the flags. - FNAME(sync_page) uses the old spte value to set a new one without checking KVM_MEM_READONLY flag. Since we flush all shadow pages when creating a new slot, the simplest fix is to disallow such problematic flag changes: this is safe because no one is doing such things. Reviewed-by: Gleb Natapov <[email protected]> Signed-off-by: Takuya Yoshikawa <[email protected]> Cc: Xiao Guangrong <[email protected]> Cc: Alex Williamson <[email protected]> Signed-off-by: Marcelo Tosatti <[email protected]>
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