On Wed, Mar 04, 2020 at 11:59:48AM +0100, Greg Kurz wrote: > On Tue, 3 Mar 2020 10:56:45 -0800 > Ram Pai <linuxram@xxxxxxxxxx> wrote: > > > On Tue, Mar 03, 2020 at 06:45:20PM +0100, Greg Kurz wrote: ....snip. > > > > > > This patch would allow at least to answer Cedric's question about > > > kernel_irqchip=off, since this looks like the only thing needed > > > to make it work. > > > > hmm.. I am not sure. Are you saying > > (a) patch the guest kernel to share the event queue page > > (b) run the qemu with "kernel_irqchip=off" > > (c) and the guest kernel with "svm=on" > > > > and it should all work? > > > > Yes. Ok. (1) applied the patch which shares the EQ-page with the hypervisor. (2) set "kernel_irqchip=off" (3) set "ic-mode=xive" (4) set "svm=on" on the kernel command line. (5) no changes to the hypervisor and ultravisor. And Boom it works!. So you were right. I am sending out the patch for (1) above ASAP. Thanks, RP
