Re: [PATCH 3/8] arm64: cpufeature: Add CPU capability for AArch32 EL1 support

[Suzuki K Poulose]

On 04/15/2020 11:14 AM, Will Deacon wrote:
> On Wed, Apr 15, 2020 at 11:13:54AM +0100, Suzuki K Poulose wrote:
> > On 04/14/2020 10:31 PM, Will Deacon wrote:
> > > Although we emit a "SANITY CHECK" warning and taint the kernel if we
> > > detect a CPU mismatch for AArch32 support at EL1, we still online the
> > > CPU with disastrous consequences for any running 32-bit VMs.
> > >
> > > Introduce a capability for AArch32 support at EL1 so that late onlining
> > > of incompatible CPUs is forbidden.
> > >
> > > Signed-off-by: Will Deacon <will@xxxxxxxxxx>
> >
> > One of the other important missing sanity check for KVM is the VMID width
> > check. I will code something up.
>
> Cheers! Do we handle things like the IPA size already?

Good point. No, we don't. I will include this too.

Cheers
Suzuki