On Tue, Sep 06, 2016 at 02:01:58PM +0100, Marc Zyngier wrote: > A little known "feature" of giving guest access to real memory mapped > HW is that it could trigger asynchronous aborts (SError on ARMv8) if > the guest accesses it in a non-conventional way (and depending on how > HW and firmware have been integrated). So far, KVM lacks any support > to handle this gracefully. > > This series introduces a set of mechanisms to catch such a fault and > deliver a vSError (or Virtual Abort for 32bit) to the offending vcpu. > > These aborts can either trigger at EL1 (whilst the guest is running), > or at EL2 (during the handling of an exit). The first case is pretty > easy to handle (use the ad-hoc vectors on arm64, or decode the EA bit > on arm), but the second one is a bit more fiddly, as we need to ensure > that the exception is pending by the time we unmask it. This is > achived by using some heavy DSBs on the hot path, with the following > caveats: > > - I've only been able to trigger the EL2 handling on A57 (Seatle, > Juno). > - I've measured a 40/50 cycles hit on Juno (A57), but I haven't > measured the impact on bigger systems > > The last patch of this series adds a missing feature to the > GICV-proxying series, delivering a vSError to a guest that performed > an illegal access to the GIC. > > Patches on top of current kvmarm/queue + the GICV przying series. przying? proxying? Or something in Polish perhaps? For the series: Reviewed-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx> Applied, thanks. -Christoffer -- 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
