On 07/03/2016 12:12, Paul Mackerras wrote: > Thomas Huth discovered that a guest could cause a hard hang of a > host CPU by setting the Instruction Authority Mask Register (IAMR) > to a suitable value. It turns out that this is because when the > code was added to context-switch the new special-purpose registers > (SPRs) that were added in POWER8, we forgot to add code to ensure > that they were restored to a sane value on guest exit. > > This adds code to set the those registers where a bad value could > compromise the execution of the host kernel to a suitable neutral > value on guest exit. > > Cc: stable@xxxxxxxxxxxxxxx # v3.14+ > Fixes: b73117c49364 > Reported-by: Thomas Huth <thuth@xxxxxxxxxx> > Signed-off-by: Paul Mackerras <paulus@xxxxxxxxx> > --- > Paolo, since this fixes a bug where a guest can cause a hard hang > of a host CPU, I'd like it to go in 4.5 if possible. Sure. Paolo -- 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
