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Krish Sadhukhan 690909c6d9 x86/mm/pat: Don't flush cache if hardware enforces cache coherency across encryption domnains 
commit 75d1cc0e05af579301ce4e49cf6399be4b4e6e76 upstream.

In some hardware implementations, coherency between the encrypted and
unencrypted mappings of the same physical page is enforced. In such a
system, it is not required for software to flush the page from all CPU
caches in the system prior to changing the value of the C-bit for the
page. So check that bit before flushing the cache.

 [ bp: Massage commit message. ]

Suggested-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200917212038.5090-3-krish.sadhukhan@oracle.com
Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-16 13:21:48 +01:00
..
amdtopology.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
cpu_entry_area.c
x86/pti/32: Calculate the various PTI cpu_entry_area sizes correctly, make the CPU_ENTRY_AREA_PAGES assert precise
2019-11-29 10:10:00 +01:00
debug_pagetables.c
x86: mm: no need to check return value of debugfs_create functions
2019-06-03 16:18:12 +02:00
dump_pagetables.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441
2019-06-05 17:37:17 +02:00
extable.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
fault.c
x86/mm: split vmalloc_sync_all()
2020-03-25 08:25:58 +01:00
highmem_32.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
hugetlbpage.c
mm: simplify MEMORY_ISOLATION && COMPACTION || CMA into CONTIG_ALLOC
2019-05-14 09:47:47 -07:00
ident_map.c
x86/mm/ident_map: Check for errors from ident_pud_init()
2020-12-30 11:51:02 +01:00
init_32.c
mm/memory_hotplug: shrink zones when offlining memory
2020-01-09 10:19:56 +01:00
init_64.c
x86/mm: Fix kern_addr_valid() to cope with existing but not present entries
2021-09-22 12:26:40 +02:00
init.c
x86/mm: Stop printing BRK addresses
2020-06-22 09:31:08 +02:00
iomap_32.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
ioremap.c
x86/ioremap: Fix CONFIG_EFI=n build
2020-04-01 11:01:59 +02:00
kasan_init_64.c
x86/kasan: Fix boot with 5-level paging and KASAN
2019-06-14 16:37:30 +02:00
kaslr.c
x86/mm/KASLR: Compute the size of the vmemmap section properly
2019-06-07 23:12:13 +02:00
kmmio.c
x86/mm/kmmio: Make the tracer robust against L1TF
2018-08-08 22:28:34 +02:00
Makefile
treewide: prefix header search paths with $(srctree)/
2019-05-18 11:49:57 +09:00
mem_encrypt_boot.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
mem_encrypt_identity.c
x86/sme: Use #define USE_EARLY_PGTABLE_L5 in mem_encrypt_identity.c
2021-11-17 09:48:19 +01:00
mem_encrypt.c
x86/mem_encrypt: Correct physical address calculation in __set_clr_pte_enc()
2021-03-30 14:35:29 +02:00
mm_internal.h
x86/mm: Do not use set_{pud, pmd}_safe() when splitting a large page
2019-05-08 19:08:35 +02:00
mmap.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
mmio-mod.c
x86/mmiotrace: Use cpumask_available() for cpumask_var_t variables
2020-06-07 13:18:51 +02:00
mpx.c
signal: Remove task parameter from force_sig
2019-05-27 09:36:28 -05:00
numa_32.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
numa_64.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
numa_emulation.c
x86, fakenuma: Fix invalid starting node ID
2020-09-09 19:12:28 +02:00
numa_internal.h
…
numa.c
x86/mm: Fix cpumask_of_node() error condition
2019-09-05 13:03:04 +02:00
pageattr-test.c
x86/mm/cpa: Simplify the code after making cpa->vaddr invariant
2018-12-17 18:54:25 +01:00
pageattr.c
x86/mm/pat: Don't flush cache if hardware enforces cache coherency across encryption domnains
2022-03-16 13:21:48 +01:00
pat_internal.h
…
pat_rbtree.c
augmented rbtree: add new RB_DECLARE_CALLBACKS_MAX macro
2019-09-25 17:51:39 -07:00
pat.c
x86: fix seq_file iteration for pat/memtype.c
2021-03-04 10:26:48 +01:00
pf_in.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
pf_in.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
pgtable_32.c
x86/mm: Rename flush_tlb_single() and flush_tlb_one() to __flush_tlb_one_[user|kernel]()
2018-02-15 01:15:52 +01:00
pgtable.c
x86/mm: Fix leak of pmd ptlock
2021-01-12 20:16:22 +01:00
physaddr.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
physaddr.h
…
pkeys.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288
2019-06-05 17:36:37 +02:00
pti.c
x86/mm/pti: Do not invoke PTI functions when PTI is disabled
2019-08-29 20:52:53 +02:00
setup_nx.c
…
srat.c
…
testmmiotrace.c
x86/mmiotrace: Lock down the testmmiotrace module
2019-08-19 21:54:16 -07:00
tlb.c
x86/membarrier: Get rid of a dubious optimization
2020-12-16 10:56:59 +01:00