From 3e7cf5b00dd5b577b4ee9b2a66e40fb670ef210b Mon Sep 17 00:00:00 2001 From: Suresh Siddha Date: Thu, 30 Jun 2011 17:19:32 -0700 Subject: x86-32, fpu: Fix DNA exception during check_fpu() Before check_fpu() is called, we have cr0.TS bit set and hence the floating point code to check the FDIV bug was generating a DNA exception. Use kernel_fpu_begin()/kernel_fpu_end() around the floating point code to avoid this unnecessary device not available exception during boot. Signed-off-by: Suresh Siddha Link: http://lkml.kernel.org/r/1309479572.2665.1372.camel@sbsiddha-MOBL3.sc.intel.com Signed-off-by: H. Peter Anvin --- arch/x86/kernel/cpu/bugs.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/x86/kernel/cpu') diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 525514cf33c3..46674fbb62ba 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -62,6 +62,8 @@ static void __init check_fpu(void) return; } + kernel_fpu_begin(); + /* * trap_init() enabled FXSR and company _before_ testing for FP * problems here. @@ -80,6 +82,8 @@ static void __init check_fpu(void) : "=m" (*&fdiv_bug) : "m" (*&x), "m" (*&y)); + kernel_fpu_end(); + boot_cpu_data.fdiv_bug = fdiv_bug; if (boot_cpu_data.fdiv_bug) printk(KERN_WARNING "Hmm, FPU with FDIV bug.\n"); -- cgit v1.2.3 From 24a42bae6852d27ae569757f5415c91538e6a255 Mon Sep 17 00:00:00 2001 From: Anupam Chanda Date: Fri, 8 Jul 2011 11:42:50 -0700 Subject: x86, hyper: Change hypervisor detection order Detect Xen before HyperV because in Viridian compatibility mode Xen presents itself as HyperV. Move Xen to the top since it seems more likely that Xen would emulate VMware than vice versa. Signed-off-by: Anupam Chanda Link: http://lkml.kernel.org/r/1310150570-26810-1-git-send-email-achanda@nicira.com Acked-by: Stefano Stabellini Acked-by: Yaozu (Eddie) Dong Reviewed-by: H. Peter Anvin Signed-off-by: H. Peter Anvin --- arch/x86/kernel/cpu/hypervisor.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/x86/kernel/cpu') diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c index 8095f8611f8a..755f64fb0743 100644 --- a/arch/x86/kernel/cpu/hypervisor.c +++ b/arch/x86/kernel/cpu/hypervisor.c @@ -32,11 +32,11 @@ */ static const __initconst struct hypervisor_x86 * const hypervisors[] = { - &x86_hyper_vmware, - &x86_hyper_ms_hyperv, #ifdef CONFIG_XEN_PVHVM &x86_hyper_xen_hvm, #endif + &x86_hyper_vmware, + &x86_hyper_ms_hyperv, }; const struct hypervisor_x86 *x86_hyper; -- cgit v1.2.3