AuxXxilium/linux_dsm_epyc7002
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d4b05923f5
linux_dsm_epyc7002/arch/x86
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Dave Hansen d4b05923f5 x86/pkeys: Make protection keys an "eager" feature 
Our XSAVE features are divided into two categories: those that
generate FPU exceptions, and those that do not.  MPX and pkeys do
not generate FPU exceptions and thus can not be used lazily.  We
disable them when lazy mode is forced on.

We have a pair of masks to collect these two sets of features, but
XFEATURE_MASK_PKRU was added to the wrong mask: XFEATURE_MASK_LAZY.
Fix it by moving the feature to XFEATURE_MASK_EAGER.

Note: this only causes problem if you boot with lazy FPU mode
(eagerfpu=off) which is *not* the default.  It also only affects
hardware which is not currently publicly available.  It looks like
eager mode is going away, but we still need this patch applied
to any kernel that has protection keys and lazy mode, which is 4.6
through 4.8 at this point, and 4.9 if the lazy removal isn't sent
to Linus for 4.9.

Fixes: c8df400984 ("x86/fpu, x86/mm/pkeys: Add PKRU xsave fields and data structures")
Signed-off-by: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20161007162342.28A49813@viggo.jf.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-10-08 12:26:44 +02:00
..
boot * Refactor the EFI memory map code into architecture neutral files 2016-09-13 20:21:55 +02:00
configs kconfig: tinyconfig: provide whole choice blocks to avoid warnings 2016-09-01 17:52:01 -07:00
crypto crypto: sha512-mb - fix ctx pointer 2016-08-16 17:09:43 +08:00
entry x86/syscalls: Remove bash-isms in syscall table generator 2016-10-05 11:34:25 +02:00
events Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-03 16:13:28 -07:00
ia32 x86/signal: Add SA_{X32,IA32}_ABI sa_flags 2016-09-14 21:28:11 +02:00
include x86/pkeys: Make protection keys an "eager" feature 2016-10-08 12:26:44 +02:00
kernel x86/apic: Prevent pointless warning messages 2016-10-08 12:18:36 +02:00
kvm Merge branch 'linus' into x86/asm, to pick up fixes 2016-09-20 08:29:21 +02:00
lguest
lib x86/mce: Improve memcpy_mcsafe() 2016-09-05 11:47:31 +02:00
math-emu
mm Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-03 17:18:52 -07:00
net
oprofile oprofile/x86: Convert x86_backtrace() to use the new unwinder 2016-09-20 08:29:34 +02:00
pci Merge branch 'linus' into x86/asm, to pick up recent fixes 2016-09-15 08:24:53 +02:00
platform Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-03 17:22:25 -07:00
power x86/asm: Get rid of __read_cr4_safe() 2016-09-30 12:40:12 +02:00
purgatory
ras x86/RAS/mce_amd_inj: Remove debugfs dir recursively on exit 2016-09-26 11:13:17 +02:00
realmode x86/boot: Rework reserve_real_mode() to allow multiple tries 2016-08-11 11:15:01 +02:00
tools x86/insn: Add AVX-512 support to the instruction decoder 2016-07-21 09:37:11 -03:00
um um/Stop conflating task_struct::stack with thread_info 2016-09-15 08:25:12 +02:00
video
xen Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-03 16:46:53 -07:00
.gitignore
Kbuild
Kconfig Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-03 17:22:25 -07:00
Kconfig.cpu
Kconfig.debug
Makefile kbuild: abort build on bad stack protector flag 2016-07-26 16:19:19 -07:00
Makefile_32.cpu
Makefile.um