----- Original Message ----- > From: "Eduardo Habkost" <ehabk...@redhat.com> > To: "Paolo Bonzini" <pbonz...@redhat.com> > Cc: qemu-devel@nongnu.org, "Haozhong Zhang" <haozhong.zh...@intel.com> > Sent: Monday, October 31, 2016 7:20:10 PM > Subject: Re: [Qemu-devel] [PULL 08/27] hostmem-file: make option 'size' > optional > > On Mon, Oct 31, 2016 at 03:37:24PM +0100, Paolo Bonzini wrote: > [...] > > @@ -1309,21 +1317,27 @@ static void *file_ram_alloc(RAMBlock *block, > > > > file_size = get_file_size(fd); > > > > - if (memory < block->page_size) { > > + if (!mem_size && file_size > 0) { > > + mem_size = file_size; > > + memory_region_set_size(block->mr, mem_size); > > + } > > + > > + if (mem_size < block->page_size) { > > error_setg(errp, "memory size 0x" RAM_ADDR_FMT " must be equal to > > " > > "or larger than page size 0x%zx", > > - memory, block->page_size); > > + mem_size, block->page_size); > > goto error; > > } > > > > - if (file_size > 0 && file_size < memory) { > > + if (file_size > 0 && file_size < mem_size) { > > error_setg(errp, "backing store %s size %"PRId64 > > " does not match 'size' option %"PRIu64, > > - path, file_size, memory); > > + path, file_size, mem_size); > > goto error; > > } > > > > - memory = ROUND_UP(memory, block->page_size); > > + mem_size = ROUND_UP(mem_size, block->page_size); > > + *memory = mem_size; > > I suggested not touching *memory unless it was zero, and setting > it to the memory region size, not the rounded-up size. Haozhong > said this was going to be changed. > > This will have the side-effect of setting block->used_length and > block->max_length to the rounded up size in > qemu_ram_alloc_from_file() (instead of the original memory region > size). I don't know what could be the consequences of that. > > This patch also skip HOST_PAGE_ALIGN-ing mem_size after getting > the file size, which would be different from the behavior when > size is specified explicitly. (And I also don't know the > consequences of that) > > Considering that this pull request failed to build, I suggest > waiting for a new version from Haozhong.
Yes, I'll drop these three patches. Paolo