ACK: [SRU Focal, Jammy, OEM-5.17, OEM-6.0, OEM-6.1, Kinetic, Lunar 0/1] LP: #2023220

[Cengiz Can]

On Wed, 2023-06-07 at 17:33 -0300, Thadeu Lima de Souza Cascardo wrote:
> [Impact]
> When PCIDs are enabled on Alder Lake and Raptor Lake, INVLPG will not
> flush
> the global TLB entries. This can lead to info leak or undefined
> behavior.
> 
> [Mitigation]
> Boot with nopcid on affected systems.
> 
> [Backports]
> Clean cherry-pick, except for 5.4, where backport from linux-5.4.y
> was picked.
> 
> [Test case]
> There is no particular test case.
> 
> [Potential regressions]
> This affects performance on the affected systems. TLB behavior could
> also be
> affected.
> 
> Dave Hansen (1):
>   x86/mm: Avoid incomplete Global INVLPG flushes

Acked-by: Cengiz Can <cengiz.can at canonical.com>

> 
>  arch/x86/include/asm/intel-family.h |  5 +++++
>  arch/x86/mm/init.c                  | 25 +++++++++++++++++++++++++
>  2 files changed, 30 insertions(+)
> 
> -- 
> 2.34.1
> 
>