linux-kernel - Re: [PATCH v4] xen: get rid of paravirt op adjust_exception

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Date:   Sat, 12 Aug 2017 12:11:34 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        x86@...nel.org, boris.ostrovsky@...cle.com, hpa@...or.com,
        tglx@...utronix.de, mingo@...hat.com, luto@...capital.net
Subject: Re: [PATCH v4] xen: get rid of paravirt op adjust_exception_frame


* Juergen Gross <jgross@...e.com> wrote:

> When running as Xen pv-guest the exception frame on the stack contains
> %r11 and %rcx additional to the other data pushed by the processor.
> 
> Instead of having a paravirt op being called for each exception type
> prepend the Xen specific code to each exception entry. When running as
> Xen pv-guest just use the exception entry with prepended instructions,
> otherwise use the entry without the Xen specific code.
> 
> Signed-off-by: Juergen Gross <jgross@...e.com>
> ---
>  arch/x86/entry/entry_64.S             | 23 ++-------
>  arch/x86/entry/entry_64_compat.S      |  1 -
>  arch/x86/include/asm/paravirt.h       |  5 --
>  arch/x86/include/asm/paravirt_types.h |  4 --
>  arch/x86/include/asm/proto.h          |  3 ++
>  arch/x86/include/asm/traps.h          | 33 ++++++++++--
>  arch/x86/kernel/asm-offsets_64.c      |  1 -
>  arch/x86/kernel/paravirt.c            |  3 --
>  arch/x86/xen/enlighten_pv.c           | 96 +++++++++++++++++++++++------------
>  arch/x86/xen/irq.c                    |  3 --
>  arch/x86/xen/xen-asm_64.S             | 45 ++++++++++++++--
>  arch/x86/xen/xen-ops.h                |  1 -
>  12 files changed, 140 insertions(+), 78 deletions(-)

Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo