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Message-ID: <28914dc436a3f8b3ef39bb5d24b2dbc21cff180e.camel@surriel.com>
Subject: Re: [RFC PATCH 2/5] entry: Add calls for save/restore auxiliary
 pt_regs
From:   Rik van Riel <riel@surriel.com>
To:     ira.weiny@intel.com, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@intel.com>
Cc:     Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, kernel-team@fb.com
Date:   Fri, 05 Aug 2022 14:34:48 -0400
In-Reply-To: <20220805173009.3128098-3-ira.weiny@intel.com>
References: <20220805173009.3128098-1-ira.weiny@intel.com>
         <20220805173009.3128098-3-ira.weiny@intel.com>
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On Fri, 2022-08-05 at 10:30 -0700, ira.weiny@intel.com wrote:
> From: Ira Weiny <ira.weiny@intel.com>
>=20
> Some architectures have auxiliary pt_regs space available to store
> information on the stack during exceptions.=C2=A0 This information is
> easier
> to obtain and store within C code rather than in arch specific
> assembly.
>=20
> Define empty calls to architecture specific save and restore
> auxiliary
> pt_regs functions.=C2=A0 Call these functions on generic entry/exit.
>=20
> 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().
>=20
> Cc: Rik van Riel <riel@surriel.com>
> Cc: Dave Hansen <dave.hansen@linux.intel.com>
> Cc: Borislav Petkov <bp@alien8.de>
> Signed-off-by: Ira Weiny <ira.weiny@intel.com>
>=20
Acked-by: Rik van Riel <riel@surriel.com>

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