On Wed, May 6, 2015 at 4:12 PM, Christoffer Dall <christoffer.dall@xxxxxxxxxx> wrote: > Hi Jérémy, > > On Tue, May 05, 2015 at 11:13:11AM +0200, Jérémy Fanguède wrote: >> To maintain cache coherency on ARM, we may need a mechanism to flush >> the data cache. > > In addition to generally just making this functionality available (see > below), do you have an actual use case in mind for this? To solve the > VGA issue, for example, we already have a patch series from Drew trying > to address this. Does that not work for you? > > There was a long discussion about this here: > https://lists.cs.columbia.edu/pipermail/kvmarm/2015-February/013593.html > > Drew then created a patch set, here: > https://lists.nongnu.org/archive/html/qemu-devel/2015-03/msg01254.html > > and replied to himself, here: > https://www.marc.info/?l=android-virt&m=142670523929132&w=3 > > Which basically says that he doesn't like having to do flushes all over > QEMU (IIUC), so he sent this version instead: > https://lists.cs.columbia.edu/pipermail/kvmarm/2015-March/014027.html > > Which he now said he'd respin. In fact, I used this ioctl in pairs with this QEMU patch series: https://lists.nongnu.org/archive/html/qemu-devel/2015-05/msg00407.html My current work doesn't do anything about vga ram, so vga issue probably still persists, but it solves others issues with some emulated devices (mainly PCI) which were failing before and now work fine with this patch. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
