Re: [PATCH v5 18/18] kvm: arm64: Allow tuning the physical address size for VM

[Suzuki K Poulose]

Hi Peter,

On 17/09/2018 15:20, Peter Maydell wrote:
> On 17 September 2018 at 11:41, Suzuki K Poulose <suzuki.poulose@xxxxxxx> wrote:
> > Allow specifying the physical address size limit for a new
> > VM via the kvm_type argument for the KVM_CREATE_VM ioctl. This
> > allows us to finalise the stage2 page table as early as possible
> > and hence perform the right checks on the memory slots
> > without complication. The size is ecnoded as Log2(PA_Size) in
> > bits[7:0] of the type field. For backward compatibility the
> > value 0 is reserved and implies 40bits. Also, lift the limit
> > of the IPA to host limit and allow lower IPA sizes (e.g, 32).
> >
> > The userspace could check the extension KVM_CAP_ARM_VM_PHYS_SHIFT
> > for the availability of this feature. The cap check returns the
> > maximum limit for the physical address shift supported by the host.
> >
> > Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
> > Cc: Christoffer Dall <cdall@xxxxxxxxxx>
> > Cc: Peter Maydel <peter.maydell@xxxxxxxxxx>
>
> Typo: my surname has two "l"s in it.

Sorry about that. I have fixed this locally. Btw, did you get
a chance to look at the patch itself ? If you did, are you fine
with the API ?

Suzuki