From: Jeremy Fitzhardinge Date: Tue, 26 Sep 2006 06:32:25 +0000 (-0700) Subject: [PATCH] x86: make __FIXADDR_TOP variable to allow it to make space for a hypervisor X-Git-Tag: v2.6.19-rc1~1130 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=052e79941a042e5be4feffa03b1fd60d93fb9e9a;p=linux-2.6-omap-h63xx.git [PATCH] x86: make __FIXADDR_TOP variable to allow it to make space for a hypervisor Make __FIXADDR_TOP a variable, so that it can be set to not get in the way of address space a hypervisor may want to reserve. Original patch by Gerd Hoffmann Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Chris Wright Cc: Gerd Hoffmann Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig index b2751eadbc5..1f83efb7a60 100644 --- a/arch/i386/Kconfig +++ b/arch/i386/Kconfig @@ -794,6 +794,7 @@ config HOTPLUG_CPU config COMPAT_VDSO bool "Compat VDSO support" default y + depends on !PARAVIRT help Map the VDSO to the predictable old-style address too. ---help--- diff --git a/arch/i386/mm/init.c b/arch/i386/mm/init.c index 353453d550a..efd0bcdac65 100644 --- a/arch/i386/mm/init.c +++ b/arch/i386/mm/init.c @@ -629,6 +629,48 @@ void __init mem_init(void) (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)) ); +#if 1 /* double-sanity-check paranoia */ + printk("virtual kernel memory layout:\n" + " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" +#ifdef CONFIG_HIGHMEM + " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" +#endif + " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" + " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" + " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" + " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" + " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", + FIXADDR_START, FIXADDR_TOP, + (FIXADDR_TOP - FIXADDR_START) >> 10, + +#ifdef CONFIG_HIGHMEM + PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, + (LAST_PKMAP*PAGE_SIZE) >> 10, +#endif + + VMALLOC_START, VMALLOC_END, + (VMALLOC_END - VMALLOC_START) >> 20, + + (unsigned long)__va(0), (unsigned long)high_memory, + ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, + + (unsigned long)&__init_begin, (unsigned long)&__init_end, + ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10, + + (unsigned long)&_etext, (unsigned long)&_edata, + ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, + + (unsigned long)&_text, (unsigned long)&_etext, + ((unsigned long)&_etext - (unsigned long)&_text) >> 10); + +#ifdef CONFIG_HIGHMEM + BUG_ON(PKMAP_BASE+LAST_PKMAP*PAGE_SIZE > FIXADDR_START); + BUG_ON(VMALLOC_END > PKMAP_BASE); +#endif + BUG_ON(VMALLOC_START > VMALLOC_END); + BUG_ON((unsigned long)high_memory > VMALLOC_START); +#endif /* double-sanity-check paranoia */ + #ifdef CONFIG_X86_PAE if (!cpu_has_pae) panic("cannot execute a PAE-enabled kernel on a PAE-less CPU!"); diff --git a/arch/i386/mm/pgtable.c b/arch/i386/mm/pgtable.c index a9f4910a22f..10126e3f817 100644 --- a/arch/i386/mm/pgtable.c +++ b/arch/i386/mm/pgtable.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include @@ -139,6 +140,12 @@ void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags) __flush_tlb_one(vaddr); } +static int fixmaps; +#ifndef CONFIG_COMPAT_VDSO +unsigned long __FIXADDR_TOP = 0xfffff000; +EXPORT_SYMBOL(__FIXADDR_TOP); +#endif + void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags) { unsigned long address = __fix_to_virt(idx); @@ -148,6 +155,25 @@ void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags) return; } set_pte_pfn(address, phys >> PAGE_SHIFT, flags); + fixmaps++; +} + +/** + * reserve_top_address - reserves a hole in the top of kernel address space + * @reserve - size of hole to reserve + * + * Can be used to relocate the fixmap area and poke a hole in the top + * of kernel address space to make room for a hypervisor. + */ +void reserve_top_address(unsigned long reserve) +{ + BUG_ON(fixmaps > 0); +#ifdef CONFIG_COMPAT_VDSO + BUG_ON(reserve != 0); +#else + __FIXADDR_TOP = -reserve - PAGE_SIZE; + __VMALLOC_RESERVE += reserve; +#endif } pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) diff --git a/include/asm-i386/fixmap.h b/include/asm-i386/fixmap.h index a48cc3f7ccc..02428cb3662 100644 --- a/include/asm-i386/fixmap.h +++ b/include/asm-i386/fixmap.h @@ -19,7 +19,11 @@ * Leave one empty page between vmalloc'ed areas and * the start of the fixmap. */ -#define __FIXADDR_TOP 0xfffff000 +#ifndef CONFIG_COMPAT_VDSO +extern unsigned long __FIXADDR_TOP; +#else +#define __FIXADDR_TOP 0xfffff000 +#endif #ifndef __ASSEMBLY__ #include @@ -93,6 +97,7 @@ enum fixed_addresses { extern void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags); +extern void reserve_top_address(unsigned long reserve); #define set_fixmap(idx, phys) \ __set_fixmap(idx, phys, PAGE_KERNEL)