[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 9/9] x86: remove the Xen-specific _PAGE_IOMAP PTE flag
The _PAGE_IO_MAP PTE flag was only used by Xen PV guests to mark PTEs that were used to map I/O regions that are 1:1 in the p2m. This allowed Xen to obtain the correct PFN when converting the MFNs read from a PTE back to their PFN. Xen guests no longer use _PAGE_IOMAP for this. Instead mfn_to_pfn() returns the correct PFN by using a combination of the m2p and p2m to determine if an MFN corresponds to a 1:1 mapping in the the p2m. Remove _PAGE_IOMAP, replacing it with _PAGE_UNUSED2 to allow for future uses of the PTE flag. Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx> Acked-by: "H. Peter Anvin" <hpa@xxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: x86@xxxxxxxxxx --- This depends on the preceeding Xen changes, so this will be merged via the Xen tree. --- arch/x86/include/asm/pgtable_types.h | 12 ++++++------ arch/x86/mm/init_32.c | 2 +- arch/x86/mm/init_64.c | 2 +- arch/x86/pci/i386.c | 2 -- arch/x86/xen/enlighten.c | 2 -- 5 files changed, 8 insertions(+), 12 deletions(-) diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index eb3d449..ead3cb7 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -17,7 +17,7 @@ #define _PAGE_BIT_PAT 7 /* on 4KB pages */ #define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */ #define _PAGE_BIT_UNUSED1 9 /* available for programmer */ -#define _PAGE_BIT_IOMAP 10 /* flag used to indicate IO mapping */ +#define _PAGE_BIT_UNUSED2 10 /* available for programmer */ #define _PAGE_BIT_HIDDEN 11 /* hidden by kmemcheck */ #define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */ #define _PAGE_BIT_SPECIAL _PAGE_BIT_UNUSED1 @@ -41,7 +41,7 @@ #define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE) #define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL) #define _PAGE_UNUSED1 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1) -#define _PAGE_IOMAP (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP) +#define _PAGE_UNUSED2 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED2) #define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT) #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE) #define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL) @@ -164,10 +164,10 @@ #define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE) #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE) -#define __PAGE_KERNEL_IO (__PAGE_KERNEL | _PAGE_IOMAP) -#define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP) -#define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP) -#define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC | _PAGE_IOMAP) +#define __PAGE_KERNEL_IO (__PAGE_KERNEL) +#define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE) +#define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS) +#define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC) #define PAGE_KERNEL __pgprot(__PAGE_KERNEL) #define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO) diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index e395048..af7259c 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -537,7 +537,7 @@ static void __init pagetable_init(void) permanent_kmaps_init(pgd_base); } -pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP); +pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL); EXPORT_SYMBOL_GPL(__supported_pte_mask); /* user-defined highmem size */ diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index f35c66c..9e6fa6d 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -151,7 +151,7 @@ early_param("gbpages", parse_direct_gbpages_on); * around without checking the pgd every time. */ -pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP; +pteval_t __supported_pte_mask __read_mostly = ~0; EXPORT_SYMBOL_GPL(__supported_pte_mask); int force_personality32; diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c index db6b1ab..1f642d6 100644 --- a/arch/x86/pci/i386.c +++ b/arch/x86/pci/i386.c @@ -433,8 +433,6 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, */ prot |= _PAGE_CACHE_UC_MINUS; - prot |= _PAGE_IOMAP; /* creating a mapping for IO */ - vma->vm_page_prot = __pgprot(prot); if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 201d09a..c5e21e3 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1555,8 +1555,6 @@ asmlinkage void __init xen_start_kernel(void) #endif __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD); - __supported_pte_mask |= _PAGE_IOMAP; - /* * Prevent page tables from being allocated in highmem, even * if CONFIG_HIGHPTE is enabled. -- 1.7.2.5 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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