On 15/01/18 19:39, James Morse wrote: > We expect to have firmware-first handling of RAS SErrors, with errors > notified via an APEI method. For systems without firmware-first, add > some minimal handling to KVM. > > There are two ways KVM can take an SError due to a guest, either may be a > RAS error: we exit the guest due to an SError routed to EL2 by HCR_EL2.AMO, > or we take an SError from EL2 when we unmask PSTATE.A from __guest_exit. > > For SError that interrupt a guest and are routed to EL2 the existing > behaviour is to inject an impdef SError into the guest. > > Add code to handle RAS SError based on the ESR. For uncontained and > uncategorized errors arm64_is_fatal_ras_serror() will panic(), these > errors compromise the host too. All other error types are contained: > For the fatal errors the vCPU can't make progress, so we inject a virtual > SError. We ignore contained errors where we can make progress as if > we're lucky, we may not hit them again. > > If only some of the CPUs support RAS the guest will see the cpufeature > sanitised version of the id registers, but we may still take RAS SError > on this CPU. Move the SError handling out of handle_exit() into a new > handler that runs before we can be preempted. This allows us to use > this_cpu_has_cap(), via arm64_is_ras_serror(). > > Signed-off-by: James Morse <james.morse@xxxxxxx> > --- > Changes since v4: > * Moved SError handling into handle_exit_early(). This will need to move > earlier, into an SError-masked region once we support kernel-first. > (hence the vauge name) > * Dropped Marc & Christoffer's Reviewed-by due to handle_exit_early(). > > arch/arm/include/asm/kvm_host.h | 3 +++ > arch/arm64/include/asm/kvm_host.h | 2 ++ > arch/arm64/kvm/handle_exit.c | 18 +++++++++++++++++- > virt/kvm/arm/arm.c | 3 +++ > 4 files changed, 25 insertions(+), 1 deletion(-) Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx> M. -- Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
