From 0c752a93353d9b17dbe148312d732fbe06d235e1 Mon Sep 17 00:00:00 2001 From: Suresh Siddha Date: Fri, 22 May 2009 12:17:45 -0700 Subject: x86: introduce noxsave boot parameter Introduce "noxsave" boot parameter which will disable the cpu's xsave/xrstor capabilities. Useful for debugging and working around xsave related issues. [ Impact: make it possible to debug problems in the field ] Signed-off-by: Suresh Siddha Signed-off-by: H. Peter Anvin --- arch/x86/kernel/cpu/common.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'arch') diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index c1caefc82e6..77848d9fca6 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -114,6 +114,13 @@ DEFINE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page) = { .gdt = { } }; EXPORT_PER_CPU_SYMBOL_GPL(gdt_page); +static int __init x86_xsave_setup(char *s) +{ + setup_clear_cpu_cap(X86_FEATURE_XSAVE); + return 1; +} +__setup("noxsave", x86_xsave_setup); + #ifdef CONFIG_X86_32 static int cachesize_override __cpuinitdata = -1; static int disable_x86_serial_nr __cpuinitdata = 1; -- cgit v1.2.3-70-g09d2