Re: [Xen-devel] [PATCH] x86: store cr4 during suspend/resume

[Jan Beulich <jbeulich@xxxxxxxx>]

On 09.12.2019 19:06, Roger Pau Monne wrote:
> Currently cr4 is not cached before suspension, and mmu_cr4_features is
> used in order to restore the expected cr4 value. This is correct so
> far because the tasklet that executes the suspend/resume code is
> running in the idle vCPU context.
> 
> In order to make the code less fragile, explicitly save the current
> cr4 value before suspension, so that it can be restored afterwards.
> This ensures that the cr4 value cached in the cpu_info doesn't get out
> of sync after resume from suspension.
> 
> Suggested-by: Jan Beulich <jbeulich@xxxxxxxx>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

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