linux-kernel - Re: [crash, bisected] Re: [PATCH 3/4] x86

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Message-ID: <48691CC5.4050603@sgi.com>
Date:	Mon, 30 Jun 2008 10:49:57 -0700
From:	Mike Travis <travis@....com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	len.brown@...el.com, Jack Steiner <steiner@....com>
Subject: Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu
 area

Jeremy Fitzhardinge wrote:
> Mike Travis wrote:
...
>> I'm not sure yet what to put into acpi_save_state_mem:
>>
>>         initial_code = (unsigned long)wakeup_long64;
>> +       /* ZZZ initial_pda = (unsigned long)?; */
>>   
> 
> You'll need to change wakeup_long64 to load the right value into the
> GS_BASE msr anyway.
> 
>    J

I'm afraid I don't quite understand the transitioning of the
ACPI states to figure out the correct thing to do.  My first
inclination would be to:  [sorry, cut and pasted]

--- linux-2.6.tip.orig/arch/x86/kernel/acpi/sleep.c
+++ linux-2.6.tip/arch/x86/kernel/acpi/sleep.c
@@ -89,6 +89,8 @@ int acpi_save_state_mem(void)
 #ifdef CONFIG_SMP
        stack_start.sp = temp_stack + 4096;
 #endif
+       early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
+       initial_pda = (unsigned long)get_cpu_pda(cpu);
        initial_code = (unsigned long)wakeup_long64;
        saved_magic = 0x123456789abcdef0;
 #endif /* CONFIG_64BIT */


But I'd like some confirmation that this is right thing to do...

[This mimics what smpboot.c:do_boot_cpu() does.]

Len - I'll cc you on the full patch submission shortly.

Thanks,
Mike
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