On 22/08/14 11:23, Mark Rutland wrote: > Hi Pranav, > > On Thu, Jul 31, 2014 at 07:53:23AM +0100, Pranavkumar Sawargaonkar wrote: >> X-Gene u-boot runs in EL2 mode with MMU enabled hence we might >> have stale EL2 tlb enteris when we enable EL2 MMU on each host CPU. > > Nit: entries > >> This can happen on any ARM/ARM64 board running bootloader in >> Hyp-mode (or EL2-mode) with MMU enabled. >> >> This patch ensures that we flush all Hyp-mode (or EL2-mode) TLBs >> on each host CPU before enabling Hyp-mode (or EL2-mode) MMU. > > I hit a similar issue intermittently on a Juno board when I boot Linux > as an EFI application, where CPU0 would get stuck in a recursive > exception at EL2 while initialising hyp. We don't nuke the TLBs in > efi_stub_entry nor do we do so in el2_setup, so there's the possibility > of stale EL2 TLB entries lying around from UEFI. > > With this patch applied I'm unable to reproduce the issue (with ~30 > boots so far). So: > > Tested-by: Mark Rutland <mark.rutland@xxxxxxx> > > It would be nice to see this hit mainline soon. Thanks for testing. I guess this is a candidate for stable as well. M. -- Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
