Re: [PATCH v2 27/39] x86/entry,xen: Early rewrite of restore_regs_and_return_to_kernel()

[Andrew Cooper]

On 24/02/2022 14:52, Peter Zijlstra wrote:
> By doing an early rewrite of 'jmp native_iret` in
> restore_regs_and_return_to_kernel() we can get rid of the last
> INTERRUPT_RETURN user and paravirt_iret.
>
> Suggested-by: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>

As an observation, if you move this earlier in the series, you'll reduce
the churn by not needing to take out ENDBRs which you inserted previously.

Patches 25-27 all look like the can be prerequisites, ahead of patch 5.

~Andrew