Re: [PATCH v3] vfio-pci: Allow to mmap sub-page MMIO BARs if the mmio page is exclusive

On 2016/5/23 23:20, Alex Williamson wrote: On Mon, 23 May 2016 11:45:34 +0800 Yongji Xie wrote: On 2016/5/20 6:33, Alex Williamson wrote: On Thu, 12 May 2016 18:20:51 +0800 Yongji Xie wrote: Current vfio-pci implementation disallows to mmap sub-page(size < PAGE_SIZE) MMIO BARs because

Re: [PATCH v3] vfio-pci: Allow to mmap sub-page MMIO BARs if the mmio page is exclusive

On Mon, 23 May 2016 11:45:34 +0800 Yongji Xie wrote: > On 2016/5/20 6:33, Alex Williamson wrote: > > > On Thu, 12 May 2016 18:20:51 +0800 > > Yongji Xie wrote: > > > >> Current vfio-pci implementation disallows to mmap > >> sub-page(size < PAGE_SIZE) MMIO BARs because these BARs' mmio > >> pa

Re: [PATCH v3] vfio-pci: Allow to mmap sub-page MMIO BARs if the mmio page is exclusive

On 2016/5/20 6:33, Alex Williamson wrote: On Thu, 12 May 2016 18:20:51 +0800 Yongji Xie wrote: Current vfio-pci implementation disallows to mmap sub-page(size < PAGE_SIZE) MMIO BARs because these BARs' mmio page may be shared with other BARs. This will cause some performance issues when we pa

Re: [PATCH v3] vfio-pci: Allow to mmap sub-page MMIO BARs if the mmio page is exclusive

On Thu, 12 May 2016 18:20:51 +0800 Yongji Xie wrote: > Current vfio-pci implementation disallows to mmap > sub-page(size < PAGE_SIZE) MMIO BARs because these BARs' mmio > page may be shared with other BARs. This will cause some > performance issues when we passthrough a PCI device with > this kin

[PATCH v3] vfio-pci: Allow to mmap sub-page MMIO BARs if the mmio page is exclusive

Current vfio-pci implementation disallows to mmap sub-page(size < PAGE_SIZE) MMIO BARs because these BARs' mmio page may be shared with other BARs. This will cause some performance issues when we passthrough a PCI device with this kind of BARs. Guest will be not able to handle the mmio accesses to