[tip:x86/fpu] x86, xsave: Disable xsave in i387 emulation mode
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From: tip-bot for Robert Richter on 12 Aug 2010 18:10 Commit-ID: 1f999ab5a1360afc388868cc0ef9afe8edeef3be Gitweb: http://git.kernel.org/tip/1f999ab5a1360afc388868cc0ef9afe8edeef3be Author: Robert Richter <robert.richter(a)amd.com> AuthorDate: Wed, 21 Jul 2010 19:03:57 +0200 Committer: H. Peter Anvin <hpa(a)linux.intel.com> CommitDate: Thu, 12 Aug 2010 14:16:54 -0700 x86, xsave: Disable xsave in i387 emulation mode xsave is broken for (!HAVE_HWFP). This is the case if config MATH_EMULATION is enabled, 'no387' kernel parameter is set and xsave exists. xsave will not work because x86/math-emu and xsave share the same memory. As this case can be treated as corner case we simply disable xsave then. Signed-off-by: Robert Richter <robert.richter(a)amd.com> LKML-Reference: <1279731838-1522-7-git-send-email-robert.richter(a)amd.com> Signed-off-by: H. Peter Anvin <hpa(a)linux.intel.com> --- arch/x86/kernel/i387.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c index 1f11f5c..2605c50 100644 --- a/arch/x86/kernel/i387.c +++ b/arch/x86/kernel/i387.c @@ -67,6 +67,12 @@ static void __cpuinit init_thread_xstate(void) */ if (!HAVE_HWFP) { + /* + * Disable xsave as we do not support it if i387 + * emulation is enabled. + */ + setup_clear_cpu_cap(X86_FEATURE_XSAVE); + setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT); xstate_size = sizeof(struct i387_soft_struct); return; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |