On Mon, Feb 14, 2022 at 3:41 AM Marc Zyngier <maz@xxxxxxxxxx> wrote: > > On Thu, 10 Feb 2022 22:41:41 +0000, > Kalesh Singh <kaleshsingh@xxxxxxxxxx> wrote: > > > > This series is based on v5.17-rc3 and adds the following stack features to > > the KVM nVHE hypervisor: > > > > == Hyp Stack Guard Pages == > > > > Based on the technique used by arm64 VMAP_STACK to detect overflow. > > i.e. the stack is aligned to twice its size which ensure that the > > 'stack shift' bit of any valid SP is 0. The 'stack shift' bit can be > > tested in the exception entry to detect overflow without corrupting GPRs. > > Having quickly parsed the code, this seems to only be effective for > pKVM and the EL2-allocated stack. Is there any technical reason not to > implement this for the much more common case of 'classic' KVM in nVHE > mode? Hi Marc, No technical reason. We hadn't thought of it from that perspective. It's a good idea, I'll look into this and repost a new version. Thanks, Kalesh > > Thanks, > > M. > > -- > Without deviation from the norm, progress is not possible. _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
