Re: [PATCH v4 05/19] kvm: arm64: Disable guest access to trace filter controls

[Suzuki K Poulose]

On 23/03/2021 09:16, Marc Zyngier wrote:
> Hi Suzuki,
>
> On 2021-03-22 22:24, Suzuki K Poulose wrote:
> > Hi Marc,
> >
> > On 25/02/2021 19:35, Suzuki K Poulose wrote:
> > > Disable guest access to the Trace Filter control registers.
> > > We do not advertise the Trace filter feature to the guest
> > > (ID_AA64DFR0_EL1: TRACE_FILT is cleared) already, but the guest
> > > can still access the TRFCR_EL1 unless we trap it.
> > >
> > > This will also make sure that the guest cannot fiddle with
> > > the filtering controls set by a nvhe host.
> > >
> > > Cc: Marc Zyngier <maz@xxxxxxxxxx>
> > > Cc: Will Deacon <will@xxxxxxxxxx>
> > > Cc: Mark Rutland <mark.rutland@xxxxxxx>
> > > Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> > > Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
> >
> > We have already have the v8.4 self hosted tracing support in 5.12-rcX.
> > Do you think you can pick this up for this 5.12 ?
>
> Sure, no problem. Shall I pick patch #3 at the same time?

Yes please.

Thanks !
Suzuki