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authorLinus Torvalds <torvalds@linux-foundation.org>2014-01-20 23:46:32 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-20 23:46:32 +0100
commitc9cdd9a6ae49704f12a289706551536ec842693f (patch)
tree21a79d8731065352e924f2bcecf257a4247c2f64 /arch/x86/kernel
parentMerge branch 'x86-kaslr-for-linus' of git://git.kernel.org/pub/scm/linux/kern... (diff)
parentx86/intel/mpx: Remove unused LWP structure (diff)
downloadlinux-c9cdd9a6ae49704f12a289706551536ec842693f.tar.xz
linux-c9cdd9a6ae49704f12a289706551536ec842693f.zip
Merge branch 'x86/mpx' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 cpufeature and mpx updates from Peter Anvin: "This includes the basic infrastructure for MPX (Memory Protection Extensions) support, but does not include MPX support itself. It is, however, a prerequisite for KVM support for MPX, which I believe will be pushed later this merge window by the KVM team. This includes moving the functionality in futex_atomic_cmpxchg_inatomic() into a new function in uaccess.h so it can be reused - this will be used by the final MPX patches. The actual MPX functionality (map management and so on) will be pushed in a future merge window, when ready" * 'x86/mpx' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/intel/mpx: Remove unused LWP structure x86, mpx: Add MPX related opcodes to the x86 opcode map x86: replace futex_atomic_cmpxchg_inatomic() with user_atomic_cmpxchg_inatomic x86: add user_atomic_cmpxchg_inatomic at uaccess.h x86, xsave: Support eager-only xsave features, add MPX support x86, cpufeature: Define the Intel MPX feature flag
Diffstat (limited to 'arch/x86/kernel')
-rw-r--r--arch/x86/kernel/xsave.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index 422fd8223470..a4b451c6addf 100644
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -562,6 +562,16 @@ static void __init xstate_enable_boot_cpu(void)
if (cpu_has_xsaveopt && eagerfpu != DISABLE)
eagerfpu = ENABLE;
+ if (pcntxt_mask & XSTATE_EAGER) {
+ if (eagerfpu == DISABLE) {
+ pr_err("eagerfpu not present, disabling some xstate features: 0x%llx\n",
+ pcntxt_mask & XSTATE_EAGER);
+ pcntxt_mask &= ~XSTATE_EAGER;
+ } else {
+ eagerfpu = ENABLE;
+ }
+ }
+
pr_info("enabled xstate_bv 0x%llx, cntxt size 0x%x\n",
pcntxt_mask, xstate_size);
}