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x86: reserve end-of-conventional-memory to 1MB, 64-bit, use paravirt_enabled

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Jeremy Fitzhardinge pointed out that looking at the boot_params
struct to determine if the system is running in a paravirtual
environment is not reliable for the Xen case, currently. He also
points out that there already exists a function to determine if
the system is running in a paravirtual environment. So let's use
that instead. This gets rid of the preprocessor test too.

Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Alexander van Heukelum 2008-03-04 20:12:28 +01:00 committed by Ingo Molnar
parent 2fde61fdb0
commit ecd94c0809
1 changed files with 1 additions and 5 deletions
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6
arch/x86/kernel/head64.c
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@ -72,12 +72,8 @@ static void __init reserve_ebda_region(void)
/* that area is absent. We'll just have to assume */
/* that the paravirt case can handle memory setup */
/* correctly, without our help. */
#ifdef CONFIG_PARAVIRT
if ((boot_params.hdr.version >= 0x207) &&
(boot_params.hdr.hardware_subarch != 0)) {
if (paravirt_enabled())
return;
}
#endif
/* end of low (conventional) memory */
lowmem = *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES);