BMC/Intel-BMC/linux.git/arch/x86/include/asm/virtext.h, branch dev

x86: Store a per-cpu shadow copy of CR4

2015-02-04T11:10:42+00:00

Context switches and TLB flushes can change individual bits of CR4. CR4 reads take several cycles, so store a shadow copy of CR4 in a per-cpu variable. To avoid wasting a cache line, I added the CR4 shadow to cpu_tlbstate, which is already touched in switch_mm. The heaviest users of the cr4 shadow will be switch_mm and __switch_to_xtra, and __switch_to_xtra is called shortly after switch_mm during context switch, so the cacheline is likely to be hot. Signed-off-by: Andy Lutomirski Reviewed-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Cc: Kees Cook Cc: Andrea Arcangeli Cc: Vince Weaver Cc: "hillf.zj" Cc: Valdis Kletnieks Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo Cc: Linus Torvalds Link: http://lkml.kernel.org/r/3a54dd3353fffbf84804398e00dfdc5b7c1afd7d.1414190806.git.luto@amacapital.net Signed-off-by: Ingo Molnar

x86: Clean up cr4 manipulation

2015-02-04T11:10:41+00:00

CR4 manipulation was split, seemingly at random, between direct (write_cr4) and using a helper (set/clear_in_cr4). Unfortunately, the set_in_cr4 and clear_in_cr4 helpers also poke at the boot code, which only a small subset of users actually wanted. This patch replaces all cr4 access in functions that don't leave cr4 exactly the way they found it with new helpers cr4_set_bits, cr4_clear_bits, and cr4_set_bits_and_update_boot. Signed-off-by: Andy Lutomirski Reviewed-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Cc: Andrea Arcangeli Cc: Vince Weaver Cc: "hillf.zj" Cc: Valdis Kletnieks Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo Cc: Kees Cook Cc: Linus Torvalds Link: http://lkml.kernel.org/r/495a10bdc9e67016b8fd3945700d46cfd5c12c2f.1414190806.git.luto@amacapital.net Signed-off-by: Ingo Molnar

Disintegrate asm/system.h for X86

2012-03-28T17:11:12+00:00

Disintegrate asm/system.h for X86. Signed-off-by: David Howells Acked-by: H. Peter Anvin cc: x86@kernel.org

KVM: SVM: Move EFER and MSR constants to generic x86 code

2009-03-24T09:02:46+00:00

MSR_EFER_SVME_MASK, MSR_VM_CR and MSR_VM_HSAVE_PA are set in KVM specific headers. Linux does have nice header files to collect EFER bits and MSR IDs, so IMHO we should put them there. While at it, I also changed the naming scheme to match that of the other defines. (introduced in v6) Acked-by: Joerg Roedel Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity

x86: cpu_emergency_svm_disable() function

2008-12-31T14:52:30+00:00

This function can be used by the reboot or kdump code to forcibly disable SVM on the CPU. Signed-off-by: Eduardo Habkost Signed-off-by: Avi Kivity

KVM: SVM: move svm_hardware_disable() code to asm/virtext.h

2008-12-31T14:52:30+00:00

Create cpu_svm_disable() function. Signed-off-by: Eduardo Habkost Signed-off-by: Avi Kivity

KVM: SVM: move has_svm() code to asm/virtext.h

2008-12-31T14:52:29+00:00

Use a trick to keep the printk()s on has_svm() working as before. gcc will take care of not generating code for the 'msg' stuff when the function is called with a NULL msg argument. Signed-off-by: Eduardo Habkost Signed-off-by: Avi Kivity

x86: cpu_emergency_vmxoff() function

2008-12-31T14:52:29+00:00

Add cpu_emergency_vmxoff() and its friends: cpu_vmx_enabled() and __cpu_emergency_vmxoff(). Signed-off-by: Eduardo Habkost Signed-off-by: Avi Kivity

x86: asm/virtext.h: add cpu_vmxoff() inline function

2008-12-31T14:52:29+00:00

Unfortunately we can't use exactly the same code from vmx hardware_disable(), because the KVM function uses the __kvm_handle_fault_on_reboot() tricks. Signed-off-by: Eduardo Habkost Signed-off-by: Avi Kivity

KVM: VMX: move cpu_has_kvm_support() to an inline on asm/virtext.h

2008-12-31T14:52:28+00:00

It will be used by core code on kdump and reboot, to disable vmx if needed. Signed-off-by: Eduardo Habkost Signed-off-by: Avi Kivity