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Re: [Xen-devel] [PATCH 3/6] x86/suspend: Don't save unnecessary GPRs
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 17 Dec 2019 12:10:55 +0000
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
- Delivery-date: Tue, 17 Dec 2019 12:11:09 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 17/12/2019 12:04, Roger Pau Monné wrote:
>> diff --git a/xen/arch/x86/acpi/wakeup_prot.S
>> b/xen/arch/x86/acpi/wakeup_prot.S
>> index 35fd7a5e9f..2f6c8e18ef 100644
>> --- a/xen/arch/x86/acpi/wakeup_prot.S
>> +++ b/xen/arch/x86/acpi/wakeup_prot.S
>> @@ -11,24 +11,14 @@
>> #define REF(x) x(%rip)
>>
>> ENTRY(do_suspend_lowlevel)
>> + push %rbp
>> + push %rbx
>> + push %r12
>> + push %r13
>> + push %r14
>> + push %r15
> I was expecting Xen had a macro for this (and the restore
> counterpart), but I haven't found any (neither any other places where
> it would be useful).
We have macros for saving and restoring all GPRs as part of an
exception, but this is just regular function prologue/epilogue logic
(which happens to be hand written asm because this function isn't quite
a regular function).
~Andrew
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