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

[Tim Gardner]

On 6/7/23 2:33 PM, 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
> 
>   arch/x86/include/asm/intel-family.h |  5 +++++
>   arch/x86/mm/init.c                  | 25 +++++++++++++++++++++++++
>   2 files changed, 30 insertions(+)
> 
Acked-by: Tim Gardner <tim.gardner at canonical.com>
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Tim Gardner
Canonical, Inc