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d79a40caf8
Assign Write-Through type to the PA7 slot in the PAT MSR when the processor is not affected by PAT errata. The PA7 slot is chosen to improve robustness in the presence of errata that might cause the high PAT bit to be ignored. This way a buggy PA7 slot access will hit the PA3 slot, which is UC, so at worst we lose performance without causing a correctness issue. The following Intel processors are affected by the PAT errata. Errata CPUID ---------------------------------------------------- Pentium 2, A52 family 0x6, model 0x5 Pentium 3, E27 family 0x6, model 0x7, 0x8 Pentium 3 Xenon, G26 family 0x6, model 0x7, 0x8, 0xa Pentium M, Y26 family 0x6, model 0x9 Pentium M 90nm, X9 family 0x6, model 0xd Pentium 4, N46 family 0xf, model 0x0 Instead of making sharp boundary checks, we remain conservative and exclude all Pentium 2, 3, M and 4 family processors. For those, _PAGE_CACHE_MODE_WT is redirected to UC- per the default setup in __cachemode2pte_tbl[]. Signed-off-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Elliott@hp.com Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Luis R. Rodriguez <mcgrof@suse.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: arnd@arndb.de Cc: hch@lst.de Cc: hmh@hmh.eng.br Cc: jgross@suse.com Cc: konrad.wilk@oracle.com Cc: linux-mm <linux-mm@kvack.org> Cc: linux-nvdimm@lists.01.org Cc: stefan.bader@canonical.com Cc: yigal@plexistor.com Link: https://lkml.kernel.org/r/1433187393-22688-2-git-send-email-toshi.kani@hp.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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| .. | ||
| kmemcheck | ||
| amdtopology.c | ||
| dump_pagetables.c | ||
| extable.c | ||
| fault.c | ||
| gup.c | ||
| highmem_32.c | ||
| hugetlbpage.c | ||
| init_32.c | ||
| init_64.c | ||
| init.c | ||
| iomap_32.c | ||
| ioremap.c | ||
| kasan_init_64.c | ||
| kmmio.c | ||
| Makefile | ||
| mm_internal.h | ||
| mmap.c | ||
| mmio-mod.c | ||
| mpx.c | ||
| numa_32.c | ||
| numa_64.c | ||
| numa_emulation.c | ||
| numa_internal.h | ||
| numa.c | ||
| pageattr-test.c | ||
| pageattr.c | ||
| pat_internal.h | ||
| pat_rbtree.c | ||
| pat.c | ||
| pf_in.c | ||
| pf_in.h | ||
| pgtable_32.c | ||
| pgtable.c | ||
| physaddr.c | ||
| physaddr.h | ||
| setup_nx.c | ||
| srat.c | ||
| testmmiotrace.c | ||
| tlb.c | ||