Messages in this thread | | | From | "Yu, Fenghua" <> | Date | Tue, 9 Aug 2011 08:40:06 -0700 | Subject | RE: [PATCH v3 1/2] x86: Enable fast strings on Intel if BIOS hasn't already |
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> -----Original Message----- > From: Andy Lutomirski [mailto:luto@MIT.EDU] > Sent: Tuesday, August 09, 2011 5:41 AM > To: x86@kernel.org; linux-kernel@vger.kernel.org > Cc: Yu, Fenghua; Matthew Garrett; Len Brown; linux- > acpi@vger.kernel.org; Ingo Molnar; Andy Lutomirski > Subject: [PATCH v3 1/2] x86: Enable fast strings on Intel if BIOS > hasn't already > > Intel SDM volume 3A, 8.4.2 says: > > Software can disable fast-string operation by clearing the > fast-string-enable bit (bit 0) of IA32_MISC_ENABLE MSR. > However, Intel recomments that system software always enable > fast-string operation. > > The Intel DQ67SW board (with latest BIOS) disables fast string > operations if TXT is enabled. A Lenovo X220 disables it regardless > of TXT setting. I doubt I'm the only person with a dumb BIOS like > this. > > Signed-off-by: Andy Lutomirski <luto@mit.edu> > --- > arch/x86/kernel/cpu/intel.c | 28 +++++++++++++++++++++++----- > 1 files changed, 23 insertions(+), 5 deletions(-)
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
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