On 07/28/2009 12:32 AM, Stephen Donnelly wrote:
What I don't understand is how to turn the host address returned from
mmap into a ram_addr_t to pass to pci_register_bar.
Memory must be allocated using the qemu RAM functions.
That seems to be the problem. The memory cannot be allocated by
qemu_ram_alloc, because it is coming from the mmap call. The memory is
already allocated outside the qemu process. mmap can indicate where in
the qemu process address space the local mapping should be, but
mapping it 'on top' of memory allocated with qemu_ram_alloc doesn't
seem to work (I get a BUG in gfn_to_pfn).
You need a variant of qemu_ram_alloc() that accepts an fd and offset and
mmaps that. A less intrusive, but uglier, alternative is to call
qemu_ram_alloc() and them mmap(MAP_FIXED) on top of that.
--
error compiling committee.c: too many arguments to function
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