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authorAndy Lutomirski <luto@amacapital.net>2014-10-24 15:58:08 -0700
committerIngo Molnar <mingo@kernel.org>2015-02-04 12:10:42 +0100
commit1e02ce4cccdcb9688386e5b8d2c9fa4660b45389 (patch)
tree7d514286844acea505228590119ac1a886cf6995
parent375074cc736ab1d89a708c0a8d7baa4a70d5d476 (diff)
x86: Store a per-cpu shadow copy of CR4
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 <luto@amacapital.net> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Kees Cook <keescook@chromium.org> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Vince Weaver <vince@deater.net> Cc: "hillf.zj" <hillf.zj@alibaba-inc.com> Cc: Valdis Kletnieks <Valdis.Kletnieks@vt.edu> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/3a54dd3353fffbf84804398e00dfdc5b7c1afd7d.1414190806.git.luto@amacapital.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--arch/x86/include/asm/paravirt.h6
-rw-r--r--arch/x86/include/asm/special_insns.h6
-rw-r--r--arch/x86/include/asm/tlbflush.h52
-rw-r--r--arch/x86/include/asm/virtext.h2
-rw-r--r--arch/x86/kernel/acpi/sleep.c2
-rw-r--r--arch/x86/kernel/cpu/common.c7
-rw-r--r--arch/x86/kernel/cpu/mtrr/cyrix.c6
-rw-r--r--arch/x86/kernel/cpu/mtrr/generic.c6
-rw-r--r--arch/x86/kernel/head32.c1
-rw-r--r--arch/x86/kernel/head64.c2
-rw-r--r--arch/x86/kernel/process_32.c2
-rw-r--r--arch/x86/kernel/process_64.c2
-rw-r--r--arch/x86/kernel/setup.c2
-rw-r--r--arch/x86/kvm/svm.c2
-rw-r--r--arch/x86/kvm/vmx.c6
-rw-r--r--arch/x86/mm/fault.c2
-rw-r--r--arch/x86/mm/init.c9
-rw-r--r--arch/x86/mm/tlb.c3
-rw-r--r--arch/x86/power/cpu.c11
-rw-r--r--arch/x86/realmode/init.c2
20 files changed, 85 insertions, 46 deletions
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 32444ae939ca..965c47d254aa 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -80,16 +80,16 @@ static inline void write_cr3(unsigned long x)
PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
}
-static inline unsigned long read_cr4(void)
+static inline unsigned long __read_cr4(void)
{
return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
}
-static inline unsigned long read_cr4_safe(void)
+static inline unsigned long __read_cr4_safe(void)
{
return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe);
}
-static inline void write_cr4(unsigned long x)
+static inline void __write_cr4(unsigned long x)
{
PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
}
diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index e820c080a4e9..6a4b00fafb00 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -137,17 +137,17 @@ static inline void write_cr3(unsigned long x)
native_write_cr3(x);
}
-static inline unsigned long read_cr4(void)
+static inline unsigned long __read_cr4(void)
{
return native_read_cr4();
}
-static inline unsigned long read_cr4_safe(void)
+static inline unsigned long __read_cr4_safe(void)
{
return native_read_cr4_safe();
}
-static inline void write_cr4(unsigned long x)
+static inline void __write_cr4(unsigned long x)
{
native_write_cr4(x);
}
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index fc0c4bc356ce..cd791948b286 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -15,14 +15,37 @@
#define __flush_tlb_single(addr) __native_flush_tlb_single(addr)
#endif
+struct tlb_state {
+#ifdef CONFIG_SMP
+ struct mm_struct *active_mm;
+ int state;
+#endif
+
+ /*
+ * Access to this CR4 shadow and to H/W CR4 is protected by
+ * disabling interrupts when modifying either one.
+ */
+ unsigned long cr4;
+};
+DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
+
+/* Initialize cr4 shadow for this CPU. */
+static inline void cr4_init_shadow(void)
+{
+ this_cpu_write(cpu_tlbstate.cr4, __read_cr4());
+}
+
/* Set in this cpu's CR4. */
static inline void cr4_set_bits(unsigned long mask)
{
unsigned long cr4;
- cr4 = read_cr4();
- cr4 |= mask;
- write_cr4(cr4);
+ cr4 = this_cpu_read(cpu_tlbstate.cr4);
+ if ((cr4 | mask) != cr4) {
+ cr4 |= mask;
+ this_cpu_write(cpu_tlbstate.cr4, cr4);
+ __write_cr4(cr4);
+ }
}
/* Clear in this cpu's CR4. */
@@ -30,9 +53,18 @@ static inline void cr4_clear_bits(unsigned long mask)
{
unsigned long cr4;
- cr4 = read_cr4();
- cr4 &= ~mask;
- write_cr4(cr4);
+ cr4 = this_cpu_read(cpu_tlbstate.cr4);
+ if ((cr4 & ~mask) != cr4) {
+ cr4 &= ~mask;
+ this_cpu_write(cpu_tlbstate.cr4, cr4);
+ __write_cr4(cr4);
+ }
+}
+
+/* Read the CR4 shadow. */
+static inline unsigned long cr4_read_shadow(void)
+{
+ return this_cpu_read(cpu_tlbstate.cr4);
}
/*
@@ -61,7 +93,7 @@ static inline void __native_flush_tlb_global_irq_disabled(void)
{
unsigned long cr4;
- cr4 = native_read_cr4();
+ cr4 = this_cpu_read(cpu_tlbstate.cr4);
/* clear PGE */
native_write_cr4(cr4 & ~X86_CR4_PGE);
/* write old PGE again and flush TLBs */
@@ -221,12 +253,6 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
#define TLBSTATE_OK 1
#define TLBSTATE_LAZY 2
-struct tlb_state {
- struct mm_struct *active_mm;
- int state;
-};
-DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
-
static inline void reset_lazy_tlbstate(void)
{
this_cpu_write(cpu_tlbstate.state, 0);
diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
index f41e19ca717b..cce9ee68e335 100644
--- a/arch/x86/include/asm/virtext.h
+++ b/arch/x86/include/asm/virtext.h
@@ -46,7 +46,7 @@ static inline void cpu_vmxoff(void)
static inline int cpu_vmx_enabled(void)
{
- return read_cr4() & X86_CR4_VMXE;
+ return __read_cr4() & X86_CR4_VMXE;
}
/** Disable VMX if it is enabled on the current CPU
diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 31368207837c..d1daead5fcdd 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -78,7 +78,7 @@ int x86_acpi_suspend_lowlevel(void)
header->pmode_cr0 = read_cr0();
if (__this_cpu_read(cpu_info.cpuid_level) >= 0) {
- header->pmode_cr4 = read_cr4();
+ header->pmode_cr4 = __read_cr4();
header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4);
}
if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 9d8fc49f0922..07f2fc3c13a4 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -19,6 +19,7 @@
#include <asm/archrandom.h>
#include <asm/hypervisor.h>
#include <asm/processor.h>
+#include <asm/tlbflush.h>
#include <asm/debugreg.h>
#include <asm/sections.h>
#include <asm/vsyscall.h>
@@ -1294,6 +1295,12 @@ void cpu_init(void)
wait_for_master_cpu(cpu);
/*
+ * Initialize the CR4 shadow before doing anything that could
+ * try to read it.
+ */
+ cr4_init_shadow();
+
+ /*
* Load microcode on this cpu if a valid microcode is available.
* This is early microcode loading procedure.
*/
diff --git a/arch/x86/kernel/cpu/mtrr/cyrix.c b/arch/x86/kernel/cpu/mtrr/cyrix.c
index 9e451b0876b5..f8c81ba0b465 100644
--- a/arch/x86/kernel/cpu/mtrr/cyrix.c
+++ b/arch/x86/kernel/cpu/mtrr/cyrix.c
@@ -138,8 +138,8 @@ static void prepare_set(void)
/* Save value of CR4 and clear Page Global Enable (bit 7) */
if (cpu_has_pge) {
- cr4 = read_cr4();
- write_cr4(cr4 & ~X86_CR4_PGE);
+ cr4 = __read_cr4();
+ __write_cr4(cr4 & ~X86_CR4_PGE);
}
/*
@@ -171,7 +171,7 @@ static void post_set(void)
/* Restore value of CR4 */
if (cpu_has_pge)
- write_cr4(cr4);
+ __write_cr4(cr4);
}
static void cyrix_set_arr(unsigned int reg, unsigned long base,
diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 0e25a1bc5ab5..7d74f7b3c6ba 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -678,8 +678,8 @@ static void prepare_set(void) __acquires(set_atomicity_lock)
/* Save value of CR4 and clear Page Global Enable (bit 7) */
if (cpu_has_pge) {
- cr4 = read_cr4();
- write_cr4(cr4 & ~X86_CR4_PGE);
+ cr4 = __read_cr4();
+ __write_cr4(cr4 & ~X86_CR4_PGE);
}
/* Flush all TLBs via a mov %cr3, %reg; mov %reg, %cr3 */
@@ -708,7 +708,7 @@ static void post_set(void) __releases(set_atomicity_lock)
/* Restore value of CR4 */
if (cpu_has_pge)
- write_cr4(cr4);
+ __write_cr4(cr4);
raw_spin_unlock(&set_atomicity_lock);
}
diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c
index d6c1b9836995..2911ef3a9f1c 100644
--- a/arch/x86/kernel/head32.c
+++ b/arch/x86/kernel/head32.c
@@ -31,6 +31,7 @@ static void __init i386_default_early_setup(void)
asmlinkage __visible void __init i386_start_kernel(void)
{
+ cr4_init_shadow();
sanitize_boot_params(&boot_params);
/* Call the subarch specific early setup function */
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index eda1a865641e..3b241f0ca005 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -155,6 +155,8 @@ asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data)
(__START_KERNEL & PGDIR_MASK)));
BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
+ cr4_init_shadow();
+
/* Kill off the identity-map trampoline */
reset_early_page_tables();
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 8f3ebfe710d0..603c4f99cb5a 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -101,7 +101,7 @@ void __show_regs(struct pt_regs *regs, int all)
cr0 = read_cr0();
cr2 = read_cr2();
cr3 = read_cr3();
- cr4 = read_cr4_safe();
+ cr4 = __read_cr4_safe();
printk(KERN_DEFAULT "CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n",
cr0, cr2, cr3, cr4);
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 5a2c02913af3..67fcc43577d2 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -93,7 +93,7 @@ void __show_regs(struct pt_regs *regs, int all)
cr0 = read_cr0();
cr2 = read_cr2();
cr3 = read_cr3();
- cr4 = read_cr4();
+ cr4 = __read_cr4();
printk(KERN_DEFAULT "FS: %016lx(%04x) GS:%016lx(%04x) knlGS:%016lx\n",
fs, fsindex, gs, gsindex, shadowgs);
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index ab4734e5411d..04e6c62f1a93 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1178,7 +1178,7 @@ void __init setup_arch(char **cmdline_p)
if (boot_cpu_data.cpuid_level >= 0) {
/* A CPU has %cr4 if and only if it has CPUID */
- mmu_cr4_features = read_cr4();
+ mmu_cr4_features = __read_cr4();
if (trampoline_cr4_features)
*trampoline_cr4_features = mmu_cr4_features;
}
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 41dd0387cccb..496a54839968 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1583,7 +1583,7 @@ static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
static int svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
- unsigned long host_cr4_mce = read_cr4() & X86_CR4_MCE;
+ unsigned long host_cr4_mce = cr4_read_shadow() & X86_CR4_MCE;
unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4;
if (cr4 & X86_CR4_VMXE)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index db77537013d1..8dca6ccbb9ce 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2785,7 +2785,7 @@ static int hardware_enable(void)
u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
u64 old, test_bits;
- if (read_cr4() & X86_CR4_VMXE)
+ if (cr4_read_shadow() & X86_CR4_VMXE)
return -EBUSY;
INIT_LIST_HEAD(&per_cpu(loaded_vmcss_on_cpu, cpu));
@@ -4255,7 +4255,7 @@ static void vmx_set_constant_host_state(struct vcpu_vmx *vmx)
vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */
/* Save the most likely value for this task's CR4 in the VMCS. */
- cr4 = read_cr4();
+ cr4 = cr4_read_shadow();
vmcs_writel(HOST_CR4, cr4); /* 22.2.3, 22.2.5 */
vmx->host_state.vmcs_host_cr4 = cr4;
@@ -7784,7 +7784,7 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
- cr4 = read_cr4();
+ cr4 = cr4_read_shadow();
if (unlikely(cr4 != vmx->host_state.vmcs_host_cr4)) {
vmcs_writel(HOST_CR4, cr4);
vmx->host_state.vmcs_host_cr4 = cr4;
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index e3ff27a5b634..ede025fb46f1 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -600,7 +600,7 @@ show_fault_oops(struct pt_regs *regs, unsigned long error_code,
printk(nx_warning, from_kuid(&init_user_ns, current_uid()));
if (pte && pte_present(*pte) && pte_exec(*pte) &&
(pgd_flags(*pgd) & _PAGE_USER) &&
- (read_cr4() & X86_CR4_SMEP))
+ (__read_cr4() & X86_CR4_SMEP))
printk(smep_warning, from_kuid(&init_user_ns, current_uid()));
}
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index d4eddbd92c28..a74aa0fd1853 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -713,6 +713,15 @@ void __init zone_sizes_init(void)
free_area_init_nodes(max_zone_pfns);
}
+DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate) = {
+#ifdef CONFIG_SMP
+ .active_mm = &init_mm,
+ .state = 0,
+#endif
+ .cr4 = ~0UL, /* fail hard if we screw up cr4 shadow initialization */
+};
+EXPORT_SYMBOL_GPL(cpu_tlbstate);
+
void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache)
{
/* entry 0 MUST be WB (hardwired to speed up translations) */
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index ee61c36d64f8..3250f2371aea 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -14,9 +14,6 @@
#include <asm/uv/uv.h>
#include <linux/debugfs.h>
-DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate)
- = { &init_mm, 0, };
-
/*
* Smarter SMP flushing macros.
* c/o Linus Torvalds.
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index 6ec7910f59bf..3e32ed5648a0 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -105,11 +105,8 @@ static void __save_processor_state(struct saved_context *ctxt)
ctxt->cr0 = read_cr0();
ctxt->cr2 = read_cr2();
ctxt->cr3 = read_cr3();
-#ifdef CONFIG_X86_32
- ctxt->cr4 = read_cr4_safe();
-#else
-/* CONFIG_X86_64 */
- ctxt->cr4 = read_cr4();
+ ctxt->cr4 = __read_cr4_safe();
+#ifdef CONFIG_X86_64
ctxt->cr8 = read_cr8();
#endif
ctxt->misc_enable_saved = !rdmsrl_safe(MSR_IA32_MISC_ENABLE,
@@ -175,12 +172,12 @@ static void notrace __restore_processor_state(struct saved_context *ctxt)
/* cr4 was introduced in the Pentium CPU */
#ifdef CONFIG_X86_32
if (ctxt->cr4)
- write_cr4(ctxt->cr4);
+ __write_cr4(ctxt->cr4);
#else
/* CONFIG X86_64 */
wrmsrl(MSR_EFER, ctxt->efer);
write_cr8(ctxt->cr8);
- write_cr4(ctxt->cr4);
+ __write_cr4(ctxt->cr4);
#endif
write_cr3(ctxt->cr3);
write_cr2(ctxt->cr2);
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index bad628a620c4..0b7a63d98440 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -81,7 +81,7 @@ void __init setup_real_mode(void)
trampoline_header->start = (u64) secondary_startup_64;
trampoline_cr4_features = &trampoline_header->cr4;
- *trampoline_cr4_features = read_cr4();
+ *trampoline_cr4_features = __read_cr4();
trampoline_pgd = (u64 *) __va(real_mode_header->trampoline_pgd);
trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd;