linux-kernel - Re: [RFC PATCH 1/5] entry: Pass pt_regs to irqentry_exit_cond

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Date:   Fri, 05 Aug 2022 14:33:32 -0400
From:   Rik van Riel <riel@...riel.com>
To:     ira.weiny@...el.com, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...el.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [RFC PATCH 1/5] entry: Pass pt_regs to
 irqentry_exit_cond_resched()

On Fri, 2022-08-05 at 10:30 -0700, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> Auxiliary pt_regs space needs to be manipulated by the generic
> entry/exit code.
> 
> Ideally irqentry_exit() would take care of handling any auxiliary
> pt_regs on exit.  Unfortunately, irqentry_exit() is not the only exit
> from exception path.  The call to irqentry_exit_cond_resched() from
> xen_pv_evtchn_do_upcall() bypasses irqentry_exit().
> 
> Make irqentry_exit_cond_resched() symmetrical with irqentry_enter()
> by
> passing pt_regs to it.  This makes irqentry_exit_cond_resched()
> capable
> of handling auxiliary pt_regs in future patches.
> 
> Cc: Rik van Riel <riel@...riel.com>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>

Acked-by: Rik van Riel <riel@...riel.com>

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