On Wednesday 24 December 2008 04:19:32 Marcelo Tosatti wrote: > On Tue, Dec 23, 2008 at 04:12:49PM +0800, Sheng Yang wrote: > > Hi Avi > > > > This patchset would enable MSI-X support. > > > > The main change is a new kind of fake device - intercepted MMIO device is > > added for supporting to intercept one page contained MSI-X entries table. > > > > I also consider of doing this intercept in userspace. But I think it's > > would be more complex to push it in userspace, for we also have to > > prevent KVM from creating page table for the page. > > Unmapping the page in userspace (with munmap) from the PCI MMIO map will > disallow KVM from creating pagetable for the page. > > > And in the future, we would add hook > > function in the read/write operation to enabling mask bit for each MSI-X > > entry, may be with pending bits. > > Can you explain it in more detail? Can't do it from userspace? > > Are there performance considerations to access in this page? > > > So I decided to put it in the kernel. > > > > Another thing is I am not very confident about modify the position of > > handling guest memory and MMIO in emulate read/write function. Is it > > would cause any side affect? > > Should not be necessary if done in userspace.
Oops... After reconsider, I think I have made a design mistake here. MMIO should can be emulated in userspace... I would update the patch. -- regards Yang, Sheng -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
