>>> On 08.01.19 at 16:45, <sergey.dya...@citrix.com> wrote: > Currently dma_bitsize is zero by default on single NUMA node machines. > This makes all alloc_domheap_pages() calls with MEMF_no_dma return NULL. > > There is only 1 user of MEMF_no_dma: dom0_memflags, which are used > during memory allocation for Dom0. Failing allocation with default > dom0_memflags is especially severe for the PV Dom0 case: it makes > alloc_chunk() to use suboptimal 2MB allocation algorithm with a search > for higher memory addresses. > > This can lead to the NMI watchdog timeout during PV Dom0 construction > on some machines, which can be worked around by specifying "dma_bits" > in Xen's cmdline manually. > > Fix the issue by ignoring MEMF_no_dma in cases when dma_bitsize is zero, > which means there is no DMA zone. This shouldn't cause any issues for > Dom0 because alloc_heap_pages() will first use higher memory addresses > for satisfying memory allocation requests. > > Signed-off-by: Sergey Dyasli <sergey.dya...@citrix.com>
Reviewed-by: Jan Beulich <jbeul...@suse.com> (could also be Suggested-by) Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
