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| author | Ian Campbell <ian.campbell@citrix.com> | 2010-02-26 17:16:01 +0000 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-02-27 14:41:16 -0800 |
| commit | 3249b7e1df6380e9d7bb3238f64f445bf614f787 (patch) | |
| tree | 59672f302da25305202f10c696d19db509e8f8b9 | |
| parent | 817a824b75b1475f1b067c8cee318c7b4d66fcde (diff) | |
| download | linux-3249b7e1df6380e9d7bb3238f64f445bf614f787.tar.bz2 | |
x86, vmi: Disable highmem PTE allocation even when CONFIG_HIGHPTE=y
Preventing HIGHPTE allocations under VMI will allow us to remove the
kmap_atomic_pte paravirt op.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
LKML-Reference: <1267204562-11844-2-git-send-email-ian.campbell@citrix.com>
Acked-by: Alok Kataria <akataria@vmware.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| -rw-r--r-- | arch/x86/kernel/vmi_32.c | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/arch/x86/kernel/vmi_32.c b/arch/x86/kernel/vmi_32.c index d430e4c30193..58aca86193e5 100644 --- a/arch/x86/kernel/vmi_32.c +++ b/arch/x86/kernel/vmi_32.c @@ -33,6 +33,7 @@ #include <asm/fixmap.h> #include <asm/apicdef.h> #include <asm/apic.h> +#include <asm/pgalloc.h> #include <asm/processor.h> #include <asm/timer.h> #include <asm/vmi_time.h> @@ -272,19 +273,11 @@ static void *vmi_kmap_atomic_pte(struct page *page, enum km_type type) void *va = kmap_atomic(page, type); /* - * Internally, the VMI ROM must map virtual addresses to physical - * addresses for processing MMU updates. By the time MMU updates - * are issued, this information is typically already lost. - * Fortunately, the VMI provides a cache of mapping slots for active - * page tables. - * - * We use slot zero for the linear mapping of physical memory, and - * in HIGHPTE kernels, slot 1 and 2 for KM_PTE0 and KM_PTE1. - * - * args: SLOT VA COUNT PFN + * We disable highmem allocations for page tables so we should never + * see any calls to kmap_atomic_pte on a highmem page. */ - BUG_ON(type != KM_PTE0 && type != KM_PTE1); - vmi_ops.set_linear_mapping((type - KM_PTE0)+1, va, 1, page_to_pfn(page)); + + BUG_ON(PageHighmem(page)); return va; } @@ -640,6 +633,12 @@ static inline int __init activate_vmi(void) u64 reloc; const struct vmi_relocation_info *rel = (struct vmi_relocation_info *)&reloc; + /* + * Prevent page tables from being allocated in highmem, even if + * CONFIG_HIGHPTE is enabled. + */ + __userpte_alloc_gfp &= ~__GFP_HIGHMEM; + if (call_vrom_func(vmi_rom, vmi_init) != 0) { printk(KERN_ERR "VMI ROM failed to initialize!"); return 0; |