lkml.org 
[lkml]   [2020]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v3 3/7] arm64/kvm: disable access to AMU registers from kvm guests
From
Date
On 11/02/2020 18:45, Ionela Voinescu wrote:
> Access to the AMU counters should be disabled by default in kvm guests,
> as information from the counters might reveal activity in other guests
> or activity on the host.
>
> Therefore, disable access to AMU registers from EL0 and EL1 in kvm
> guests by:
> - Hiding the presence of the extension in the feature register
> (SYS_ID_AA64PFR0_EL1) on the VCPU.
> - Disabling access to the AMU registers before switching to the guest.
> - Trapping accesses and injecting an undefined instruction into the
> guest.
>
> Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
> Cc: Marc Zyngier <maz@kernel.org>
> Cc: James Morse <james.morse@arm.com>
> Cc: Julien Thierry <julien.thierry.kdev@gmail.com>
> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> ---

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>

\
 
 \ /
  Last update: 2020-02-12 17:34    [W:0.349 / U:0.256 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site