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* mprotect: prevent alteration of the PAT bitsVenki Pallipadi2008-05-151-3/+13
| | | | | | | | | | | | | There is a defect in mprotect, which lets the user change the page cache type bits by-passing the kernel reserve_memtype and free_memtype wrappers. Fix the problem by not letting mprotect change the PAT bits. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mm: introduce pte_special pte bitNick Piggin2008-04-281-0/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | s390 for one, cannot implement VM_MIXEDMAP with pfn_valid, due to their memory model (which is more dynamic than most). Instead, they had proposed to implement it with an additional path through vm_normal_page(), using a bit in the pte to determine whether or not the page should be refcounted: vm_normal_page() { ... if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) { if (vma->vm_flags & VM_MIXEDMAP) { #ifdef s390 if (!mixedmap_refcount_pte(pte)) return NULL; #else if (!pfn_valid(pfn)) return NULL; #endif goto out; } ... } This is fine, however if we are allowed to use a bit in the pte to determine refcountedness, we can use that to _completely_ replace all the vma based schemes. So instead of adding more cases to the already complex vma-based scheme, we can have a clearly seperate and simple pte-based scheme (and get slightly better code generation in the process): vm_normal_page() { #ifdef s390 if (!mixedmap_refcount_pte(pte)) return NULL; return pte_page(pte); #else ... #endif } And finally, we may rather make this concept usable by any architecture rather than making it s390 only, so implement a new type of pte state for this. Unfortunately the old vma based code must stay, because some architectures may not be able to spare pte bits. This makes vm_normal_page a little bit more ugly than we would like, but the 2 cases are clearly seperate. So introduce a pte_special pte state, and use it in mm/memory.c. It is currently a noop for all architectures, so this doesn't actually result in any compiled code changes to mm/memory.o. BTW: I haven't put vm_normal_page() into arch code as-per an earlier suggestion. The reason is that, regardless of where vm_normal_page is actually implemented, the *abstraction* is still exactly the same. Also, while it depends on whether the architecture has pte_special or not, that is the only two possible cases, and it really isn't an arch specific function -- the role of the arch code should be to provide primitive functions and accessors with which to build the core code; pte_special does that. We do not want architectures to know or care about vm_normal_page itself, and we definitely don't want them being able to invent something new there out of sight of mm/ code. If we made vm_normal_page an arch function, then we have to make vm_insert_mixed (next patch) an arch function too. So I don't think moving it to arch code fundamentally improves any abstractions, while it does practically make the code more difficult to follow, for both mm and arch developers, and easier to misuse. [akpm@linux-foundation.org: build fix] Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: Carsten Otte <cotte@de.ibm.com> Cc: Jared Hulbert <jaredeh@gmail.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'for-linus' of ↵Linus Torvalds2008-04-251-0/+9
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86-pat * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86-pat: generic: add ioremap_wc() interface wrapper /dev/mem: make promisc the default pat: cleanups x86: PAT use reserve free memtype in mmap of /dev/mem x86: PAT phys_mem_access_prot_allowed for dev/mem mmap x86: PAT avoid aliasing in /dev/mem read/write devmem: add range_is_allowed() check to mmap of /dev/mem x86: introduce /dev/mem restrictions with a config option
| * x86: PAT phys_mem_access_prot_allowed for dev/mem mmapvenkatesh.pallipadi@intel.com2008-04-241-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduce phys_mem_access_prot_allowed(), which checks whether the mapping is possible, without any conflicts and returns success or failure based on that. phys_mem_access_prot() by itself does not allow failure case. This ability to return error is needed for PAT where we may have aliasing conflicts. x86 setup __HAVE_PHYS_MEM_ACCESS_PROT and move x86 specific code out of /dev/mem into arch specific area. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | x86: unify pgd ctor/dtorJeremy Fitzhardinge2008-04-241-0/+16
| | | | | | | | | | | | | | | | | | | | All pagetables need fundamentally the same setup and destruction, so just use the same code for everything. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* | x86: unify KERNEL_PGD_PTRSJeremy Fitzhardinge2008-04-241-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make KERNEL_PGD_PTRS common, as previously it was only being defined for 32-bit. There are a couple of follow-on changes from this: - KERNEL_PGD_PTRS was being defined in terms of USER_PGD_PTRS. The definition of USER_PGD_PTRS doesn't really make much sense on x86-64, since it can have two different user address-space configurations. I renamed USER_PGD_PTRS to KERNEL_PGD_BOUNDARY, which is meaningful for all of 32/32, 32/64 and 64/64 process configurations. - USER_PTRS_PER_PGD was also defined and was being used for similar purposes. Converting its users to KERNEL_PGD_BOUNDARY left it completely unused, and so I removed it. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Andi Kleen <ak@suse.de> Cc: Zach Amsden <zach@vmware.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* | x86/pgtable.h: demacro ptep_clear_flush_youngJeremy Fitzhardinge2008-04-241-8/+2
| | | | | | | | | | | | Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* | x86/pgtable.h: demacro ptep_test_and_clear_youngJeremy Fitzhardinge2008-04-241-9/+2
| | | | | | | | | | | | Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* | x86/pgtable.h: demacro ptep_set_access_flagsJeremy Fitzhardinge2008-04-241-10/+3
|/ | | | | | Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: pgtable, document pde bitsJiri Slaby2008-04-171-7/+7
| | | | | | | | Some of pde bits weren't documented, add the short description to them. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* include/asm-x86/pgtable.h: checkpatch cleanups - formatting onlyJoe Perches2008-04-171-36/+120
| | | | | Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: PAT add ioremap_wc() interfacevenkatesh.pallipadi@intel.com2008-04-171-0/+2
| | | | | | | | | | Introduce ioremap_wc for wc remap. (generic wrapper is in a later patch) Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: PAT infrastructure patchvenkatesh.pallipadi@intel.com2008-04-171-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Sets up pat_init() infrastructure. PAT MSR has following setting. PAT |PCD ||PWT ||| 000 WB _PAGE_CACHE_WB 001 WC _PAGE_CACHE_WC 010 UC- _PAGE_CACHE_UC_MINUS 011 UC _PAGE_CACHE_UC We are effectively changing WT from boot time setting to WC. UC_MINUS is used to provide backward compatibility to existing /dev/mem users(X). reserve_memtype and free_memtype are new interfaces for maintaining alias-free mapping. It is currently implemented in a simple way with a linked list and not optimized. reserve and free tracks the effective memory type, as a result of PAT and MTRR setting rather than what is actually requested in PAT. pat_init piggy backs on mtrr_init as the rules for setting both pat and mtrr are same. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: fix performance drop for glxSuresh Siddha2008-03-261-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | fix the 3D performance drop reported at: http://bugzilla.kernel.org/show_bug.cgi?id=10328 fb drivers are using ioremap()/ioremap_nocache(), followed by mtrr_add with WC attribute. Recent changes in page attribute code made both ioremap()/ioremap_nocache() mappings as UC (instead of previous UC-). This breaks the graphics performance, as the effective memory type is UC instead of expected WC. The correct way to fix this is to add ioremap_wc() (which uses UC- in the absence of PAT kernel support and WC with PAT) and change all the fb drivers to use this new ioremap_wc() API. We can take this correct and longer route for post 2.6.25. For now, revert back to the UC- behavior for ioremap/ioremap_nocache. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: sparse warnings in pageattr.cHarvey Harrison2008-02-091-1/+1
| | | | | | | | | | Adjust the definition of lookup_address to take an unsigned long level argument. Adjust callers in xen/mmu.c that pass in a dummy variable. Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: cpa, add the PAT bit definesAndi Kleen2008-02-041-0/+4
| | | | | | Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: use the same pgd_list for PAE and 64-bitJeremy Fitzhardinge2008-01-301-0/+2
| | | | | | | | | | Use a standard list threaded through page->lru for maintaining the pgd list on PAE. This is the same as 64-bit, and seems saner than using a non-standard list via page->index. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: cpa: fix the self-testIngo Molnar2008-01-301-0/+1
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: add PAGE_KERNEL_EXEC_NOCACHEIngo Molnar2008-01-301-0/+2
| | | | | | | add PAGE_KERNEL_EXEC_NOCACHE. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: add PG_LEVEL enumThomas Gleixner2008-01-301-0/+6
| | | | | | | this way PG_LEVEL_1GB will be an easy change. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: clean up lookup_address() declarationsThomas Gleixner2008-01-301-0/+8
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: introduce canon_pgprot()Andi Kleen2008-01-301-0/+2
| | | | | | | | Introduce canon_pgprot() Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: don't drop NX bit in pte modifier functions on 32-bitAndi Kleen2008-01-301-6/+6
| | | | | | | | | | | | | | | The pte_* modifier functions that cleared bits dropped the NX bit on 32bit PAE because they only worked in int, but NX is in bit 63. Fix that by adding appropiate casts so that the arithmetic happens as long long on PAE kernels. I decided to just use 64bit arithmetic instead of open coding like pte_modify() because gcc should generate good enough code for that now. Signed-off-by: Andi Kleen <ak@suse.de> Acked-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: add pte_pgprot to 32-bitAndi Kleen2008-01-301-0/+2
| | | | | | | | | | | 64bit already had it. Needed for later patches. Signed-off-by: Andi Kleen <ak@suse.de> Acked-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: shrink __PAGE_KERNEL/__PAGE_KERNEL_EXEC on non PAE kernelsAndi Kleen2008-01-301-1/+1
| | | | | | | | | No need to make it 64bit there. Signed-off-by: Andi Kleen <ak@suse.de> Acked-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: add pte accessors for the global bitAndi Kleen2008-01-301-0/+3
| | | | | | | | | Needed for some test code. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: clean up pte_execAndi Kleen2008-01-301-0/+1
| | | | | | | | | | | | - Rename it to pte_exec() from pte_exec_kernel(). There is nothing kernel specific in there. - Move it into the common file because _PAGE_NX is 0 on !PAE and then pte_exec() will be always evaluate to true. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86/pgtable: explain constant sign extension problemJeremy Fitzhardinge2008-01-301-0/+5
| | | | | | | | | | | | | | | | | | | When the _PAGE_FOO constants are defined as (1ul << _PAGE_BIT_FOO), they become unsigned longs. In 32-bit PAE mode, these end up being implicitly cast to 64-bit types when used to manipulate a pte, and because they're unsigned the top 32-bits are 0, destroying the upper bits of the pte. When _PAGE_FOO constants are given a signed integer type, the cast to 64-bits will sign-extend so that the upper bits are all ones, preserving the upper pte bits in manipulations. Explain this in a prominent place. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: unify paravirt pagetable accessorsJeremy Fitzhardinge2008-01-301-14/+49
| | | | | | | | | | | | | | | | | | Put all the defines for mapping pagetable operations to their native versions (for the non-paravirt case) into one place. Make the corresponding changes to paravirt.h. The tricky part here is that when a pagetable entry can't be updated atomically (ie, 32-bit PAE), we need special handlers for pte_clear, set_pte_atomic and set_pte_present. However, the other two modes don't need special handling for these, and can use a common set_pte(_at) path. [ mingo@elte.hu: fixes ] Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: unify zero_page definitionJeremy Fitzhardinge2008-01-301-0/+8
| | | | | | | | Move ZERO_PAGE/empty_zero_page to common place. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: fix warningJeremy Fitzhardinge2008-01-301-1/+1
| | | | | | | | &ptep->pte isn't always an unsigned long *, so cast it to avoid a warning. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: pgtable: unify pte accessorsJeremy Fitzhardinge2008-01-301-1/+109
| | | | | | | | Make various pte accessors common. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: unify pgtable accessors which use, #2Ingo Molnar2008-01-301-0/+15
| | | | | | | | | | based on: Subject: x86: unify pgtable accessors which use supported_pte_mask From: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: unify pgtable accessors which useJeremy Fitzhardinge2008-01-301-0/+14
| | | | | | | | | | | Make users of supported_pte_mask common. This has the side-effect of introducing the variable for 32-bit non-PAE, but I think its a pretty small cost to simplify the code. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86/pgtable: unify pagetable accessors, #6Jeremy Fitzhardinge2008-01-301-0/+28
| | | | | | | | | | Unify functions to test and set bits in pagetable entries. NOP: only moves existing code around, without any change to it. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86/pgtable: fix constant sign extension problemIngo Molnar2008-01-301-12/+12
| | | | | | | | | | based on: Subject: x86/pgtable: fix constant sign extension problem From: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: move all asm/pgtable constants into one placeJeremy Fitzhardinge2008-01-301-0/+119
| | | | | | | | | | 32 and 64-bit use the same flags for pagetable entries, so make them all common. [ mingo@elte.hu: fixes ] Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* i386/x86_64: move headers to include/asm-x86Thomas Gleixner2007-10-111-0/+5
Move the headers to include/asm-x86 and fixup the header install make rules Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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