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hostmem: introduce host_memory_backend_mr_inited()

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We were checking this against memory region size of host memory
backend's mr field to see whether the mr has been inited. This is
efficient but less elegant. Let's make a helper for it to avoid
confusions, along with some notes.

Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <1489151370-15453-2-git-send-email-peterx@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Peter Xu 2017-03-10 21:09:29 +08:00 committed by Eduardo Habkost
parent 991db24774
commit 4728b57410
2 changed files with 10 additions and 0 deletions
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9
backends/hostmem.c
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@ -237,6 +237,15 @@ static void host_memory_backend_init(Object *obj)
backend->prealloc = mem_prealloc;
}
bool host_memory_backend_mr_inited(HostMemoryBackend *backend)
{
/*
* NOTE: We forbid zero-length memory backend, so here zero means
* "we haven't inited the backend memory region yet".
*/
return memory_region_size(&backend->mr) != 0;
}
MemoryRegion *
host_memory_backend_get_memory(HostMemoryBackend *backend, Error **errp)
{

1
include/sysemu/hostmem.h
View File

@ -62,6 +62,7 @@ struct HostMemoryBackend {
MemoryRegion mr;
};
bool host_memory_backend_mr_inited(HostMemoryBackend *backend);
MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend,
Error **errp);