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| author | Ingo Molnar <mingo@kernel.org> | 2015-05-20 11:59:45 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-20 12:01:01 +0200 |
| commit | 6f56a8d024757e2f3bda8bf3bdf6aa1a21e6810b (patch) | |
| tree | 923d044c9cb5e3e89fdf02af35acc050e4f39195 /arch/x86/kernel/fpu | |
| parent | x86/fpu/init: Clean up and comment the __setup() functions (diff) | |
| parent | x86/fpu: Disable XSAVES* support for now (diff) | |
| download | linux-6f56a8d024757e2f3bda8bf3bdf6aa1a21e6810b.tar.xz linux-6f56a8d024757e2f3bda8bf3bdf6aa1a21e6810b.zip | |
Merge branch 'x86/urgent' into x86/fpu, to resolve a conflict
Conflicts:
arch/x86/kernel/i387.c
This commit is conflicting:
e88221c50cad ("x86/fpu: Disable XSAVES* support for now")
These functions changed a lot, move the quirk to arch/x86/kernel/fpu/init.c's
fpu__init_system_xstate_size_legacy().
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/fpu')
| -rw-r--r-- | arch/x86/kernel/fpu/init.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c index 9da740e236d5..fc878fee6a51 100644 --- a/arch/x86/kernel/fpu/init.c +++ b/arch/x86/kernel/fpu/init.c @@ -167,6 +167,20 @@ static void __init fpu__init_system_xstate_size_legacy(void) else xstate_size = sizeof(struct fregs_state); } + /* + * Quirk: we don't yet handle the XSAVES* instructions + * correctly, as we don't correctly convert between + * standard and compacted format when interfacing + * with user-space - so disable it for now. + * + * The difference is small: with recent CPUs the + * compacted format is only marginally smaller than + * the standard FPU state format. + * + * ( This is easy to backport while we are fixing + * XSAVES* support. ) + */ + setup_clear_cpu_cap(X86_FEATURE_XSAVES); } /* |