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x86/xen: Get rid of paravirt op adjust_exception_frame

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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.

[ tglx: Merged through tip to avoid ugly merge conflict ]

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: xen-devel@lists.xenproject.org
Cc: boris.ostrovsky@oracle.com
Cc: luto@amacapital.net
Link: http://lkml.kernel.org/r/20170831174249.26853-1-jg@pfupf.net
This commit is contained in:
Juergen Gross
2017-08-31 19:42:49 +02:00
committed by Thomas Gleixner
parent ef1d4deab9
commit 5878d5d6fd
12 changed files with 133 additions and 77 deletions
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arch/x86/entry/entry_64_compat.S
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@@ -293,7 +293,6 @@ ENTRY(entry_INT80_compat)
/*
* Interrupts are off on entry.
*/
PARAVIRT_ADJUST_EXCEPTION_FRAME
ASM_CLAC /* Do this early to minimize exposure */
SWAPGS