linux-kernel - Re: [RFC PATCH 2/5] entry: Add calls for save/restore auxiliary pt

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Date:   Fri, 05 Aug 2022 14:34:48 -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 2/5] entry: Add calls for save/restore auxiliary
 pt_regs

On Fri, 2022-08-05 at 10:30 -0700, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> Some architectures have auxiliary pt_regs space available to store
> information on the stack during exceptions.  This information is
> easier
> to obtain and store within C code rather than in arch specific
> assembly.
> 
> Define empty calls to architecture specific save and restore
> auxiliary
> pt_regs functions.  Call these functions on generic entry/exit.
> 
> NOTE: Due to the split nature of the Xen exit code
> irqentry_exit_cond_resched() requires an unbalanced call to
> arch_restore_aux_pt_regs().
> 
> 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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