[GIT PULL] x86/apic changes for v4.10

From: Ingo Molnar
Date: Mon Dec 12 2016 - 04:19:41 EST

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Linus,

Please pull the latest x86-apic-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-apic-for-linus

# HEAD: 5d07c2cc1962facb2f5d57b7b62987c213643724 x86/msr: Cleanup/streamline MSR helpers

Misc changes:

- Optimize (reduce) IRQ handler tracing overhead (Wanpeng Li)

- Clean up MSR helpers (Borislav Petkov)

- Fix build warning on some configs (Sebastian Andrzej Siewior)

Thanks,

Ingo

------------------>
Borislav Petkov (1):
x86/msr: Cleanup/streamline MSR helpers

Sebastian Andrzej Siewior (1):
x86/apic: Get rid of "warning: 'acpi_ioapic_lock' defined but not used"

Wanpeng Li (2):
x86/msr: Add wrmsr_notrace()
x86/apic: Prevent tracing on apic_msr_write_eoi()

arch/x86/include/asm/apic.h | 3 ++-
arch/x86/include/asm/msr.h | 46 +++++++++++++++++++++++++++++----------------
arch/x86/kernel/acpi/boot.c | 2 ++
arch/x86/kernel/apic/apic.c | 1 +
arch/x86/kernel/kvm.c | 4 ++--
arch/x86/kernel/smp.c | 2 --
arch/x86/lib/msr.c | 4 ++--
7 files changed, 39 insertions(+), 23 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index f5aaf6c83222..a5a0bcfde76a 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -196,7 +196,7 @@ static inline void native_apic_msr_write(u32 reg, u32 v)

static inline void native_apic_msr_eoi_write(u32 reg, u32 v)
{
- wrmsr(APIC_BASE_MSR + (APIC_EOI >> 4), APIC_EOI_ACK, 0);
+ wrmsr_notrace(APIC_BASE_MSR + (APIC_EOI >> 4), APIC_EOI_ACK, 0);
}

static inline u32 native_apic_msr_read(u32 reg)
@@ -332,6 +332,7 @@ struct apic {
* on write for EOI.
*/
void (*eoi_write)(u32 reg, u32 v);
+ void (*native_eoi_write)(u32 reg, u32 v);
u64 (*icr_read)(void);
void (*icr_write)(u32 low, u32 high);
void (*wait_icr_idle)(void);
diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index b5fee97813cd..db0b90c3b03e 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -70,14 +70,14 @@ extern struct tracepoint __tracepoint_read_msr;
extern struct tracepoint __tracepoint_write_msr;
extern struct tracepoint __tracepoint_rdpmc;
#define msr_tracepoint_active(t) static_key_false(&(t).key)
-extern void do_trace_write_msr(unsigned msr, u64 val, int failed);
-extern void do_trace_read_msr(unsigned msr, u64 val, int failed);
-extern void do_trace_rdpmc(unsigned msr, u64 val, int failed);
+extern void do_trace_write_msr(unsigned int msr, u64 val, int failed);
+extern void do_trace_read_msr(unsigned int msr, u64 val, int failed);
+extern void do_trace_rdpmc(unsigned int msr, u64 val, int failed);
#else
#define msr_tracepoint_active(t) false
-static inline void do_trace_write_msr(unsigned msr, u64 val, int failed) {}
-static inline void do_trace_read_msr(unsigned msr, u64 val, int failed) {}
-static inline void do_trace_rdpmc(unsigned msr, u64 val, int failed) {}
+static inline void do_trace_write_msr(unsigned int msr, u64 val, int failed) {}
+static inline void do_trace_read_msr(unsigned int msr, u64 val, int failed) {}
+static inline void do_trace_rdpmc(unsigned int msr, u64 val, int failed) {}
#endif

static inline unsigned long long native_read_msr(unsigned int msr)
@@ -115,22 +115,36 @@ static inline unsigned long long native_read_msr_safe(unsigned int msr,
}

/* Can be uninlined because referenced by paravirt */
-notrace static inline void native_write_msr(unsigned int msr,
- unsigned low, unsigned high)
+static inline void notrace
+__native_write_msr_notrace(unsigned int msr, u32 low, u32 high)
{
asm volatile("1: wrmsr\n"
"2:\n"
_ASM_EXTABLE_HANDLE(1b, 2b, ex_handler_wrmsr_unsafe)
: : "c" (msr), "a"(low), "d" (high) : "memory");
+}
+
+/* Can be uninlined because referenced by paravirt */
+static inline void notrace
+native_write_msr(unsigned int msr, u32 low, u32 high)
+{
+ __native_write_msr_notrace(msr, low, high);
if (msr_tracepoint_active(__tracepoint_write_msr))
do_trace_write_msr(msr, ((u64)high << 32 | low), 0);
}

+static inline void
+wrmsr_notrace(unsigned int msr, u32 low, u32 high)
+{
+ __native_write_msr_notrace(msr, low, high);
+}
+
/* Can be uninlined because referenced by paravirt */
-notrace static inline int native_write_msr_safe(unsigned int msr,
- unsigned low, unsigned high)
+static inline int notrace
+native_write_msr_safe(unsigned int msr, u32 low, u32 high)
{
int err;
+
asm volatile("2: wrmsr ; xor %[err],%[err]\n"
"1:\n\t"
".section .fixup,\"ax\"\n\t"
@@ -223,7 +237,7 @@ do { \
(void)((high) = (u32)(__val >> 32)); \
} while (0)

-static inline void wrmsr(unsigned msr, unsigned low, unsigned high)
+static inline void wrmsr(unsigned int msr, u32 low, u32 high)
{
native_write_msr(msr, low, high);
}
@@ -231,13 +245,13 @@ static inline void wrmsr(unsigned msr, unsigned low, unsigned high)
#define rdmsrl(msr, val) \
((val) = native_read_msr((msr)))

-static inline void wrmsrl(unsigned msr, u64 val)
+static inline void wrmsrl(unsigned int msr, u64 val)
{
native_write_msr(msr, (u32)(val & 0xffffffffULL), (u32)(val >> 32));
}

/* wrmsr with exception handling */
-static inline int wrmsr_safe(unsigned msr, unsigned low, unsigned high)
+static inline int wrmsr_safe(unsigned int msr, u32 low, u32 high)
{
return native_write_msr_safe(msr, low, high);
}
@@ -252,7 +266,7 @@ static inline int wrmsr_safe(unsigned msr, unsigned low, unsigned high)
__err; \
})

-static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
+static inline int rdmsrl_safe(unsigned int msr, unsigned long long *p)
{
int err;

@@ -325,12 +339,12 @@ static inline int wrmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 q)
static inline void rdmsr_on_cpus(const struct cpumask *m, u32 msr_no,
struct msr *msrs)
{
- rdmsr_on_cpu(0, msr_no, &(msrs[0].l), &(msrs[0].h));
+ rdmsr_on_cpu(0, msr_no, &(msrs[0].l), &(msrs[0].h));
}
static inline void wrmsr_on_cpus(const struct cpumask *m, u32 msr_no,
struct msr *msrs)
{
- wrmsr_on_cpu(0, msr_no, msrs[0].l, msrs[0].h);
+ wrmsr_on_cpu(0, msr_no, msrs[0].l, msrs[0].h);
}
static inline int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no,
u32 *l, u32 *h)
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 8a5abaa7d453..066ceb7767b8 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -76,6 +76,7 @@ int acpi_fix_pin2_polarity __initdata;
static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
#endif

+#ifdef CONFIG_X86_IO_APIC
/*
* Locks related to IOAPIC hotplug
* Hotplug side:
@@ -88,6 +89,7 @@ static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
* ->ioapic_lock
*/
static DEFINE_MUTEX(acpi_ioapic_lock);
+#endif

/* --------------------------------------------------------------------------
Boot-time Configuration
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 88c657b057e2..2686894350a4 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2263,6 +2263,7 @@ void __init apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v))
for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
/* Should happen once for each apic */
WARN_ON((*drv)->eoi_write == eoi_write);
+ (*drv)->native_eoi_write = (*drv)->eoi_write;
(*drv)->eoi_write = eoi_write;
}
}
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index edbbfc854e39..aad52f1b0f9f 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -308,7 +308,7 @@ static void kvm_register_steal_time(void)

static DEFINE_PER_CPU(unsigned long, kvm_apic_eoi) = KVM_PV_EOI_DISABLED;

-static void kvm_guest_apic_eoi_write(u32 reg, u32 val)
+static notrace void kvm_guest_apic_eoi_write(u32 reg, u32 val)
{
/**
* This relies on __test_and_clear_bit to modify the memory
@@ -319,7 +319,7 @@ static void kvm_guest_apic_eoi_write(u32 reg, u32 val)
*/
if (__test_and_clear_bit(KVM_PV_EOI_BIT, this_cpu_ptr(&kvm_apic_eoi)))
return;
- apic_write(APIC_EOI, APIC_EOI_ACK);
+ apic->native_eoi_write(APIC_EOI, APIC_EOI_ACK);
}

static void kvm_guest_cpu_init(void)
diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c
index c00cb64bc0a1..68f8cc222f25 100644
--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -261,10 +261,8 @@ static inline void __smp_reschedule_interrupt(void)

__visible void smp_reschedule_interrupt(struct pt_regs *regs)
{
- irq_enter();
ack_APIC_irq();
__smp_reschedule_interrupt();
- irq_exit();
/*
* KVM uses this interrupt to force a cpu out of guest mode
*/
diff --git a/arch/x86/lib/msr.c b/arch/x86/lib/msr.c
index d1dee753b949..07764255b611 100644
--- a/arch/x86/lib/msr.c
+++ b/arch/x86/lib/msr.c
@@ -113,14 +113,14 @@ int msr_clear_bit(u32 msr, u8 bit)
}

#ifdef CONFIG_TRACEPOINTS
-void do_trace_write_msr(unsigned msr, u64 val, int failed)
+void do_trace_write_msr(unsigned int msr, u64 val, int failed)
{
trace_write_msr(msr, val, failed);
}
EXPORT_SYMBOL(do_trace_write_msr);
EXPORT_TRACEPOINT_SYMBOL(write_msr);

-void do_trace_read_msr(unsigned msr, u64 val, int failed)
+void do_trace_read_msr(unsigned int msr, u64 val, int failed)
{
trace_read_msr(msr, val, failed);
}

Next message: Vlastimil Babka: "Re: [PATCH] mm: fadvise: avoid expensive remote LRU cache draining after FADV_DONTNEED"
Previous message: Ingo Molnar: "[GIT PULL] hotplug API fix"
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