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Diffstat (limited to 'arch/x86/hyperv/hv_apic.c')
-rw-r--r--arch/x86/hyperv/hv_apic.c63
1 files changed, 41 insertions, 22 deletions
diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c
index 90e682a92820..db2d92fb44da 100644
--- a/arch/x86/hyperv/hv_apic.c
+++ b/arch/x86/hyperv/hv_apic.c
@@ -99,7 +99,8 @@ static void hv_apic_eoi_write(u32 reg, u32 val)
/*
* IPI implementation on Hyper-V.
*/
-static bool __send_ipi_mask_ex(const struct cpumask *mask, int vector)
+static bool __send_ipi_mask_ex(const struct cpumask *mask, int vector,
+ bool exclude_self)
{
struct hv_send_ipi_ex **arg;
struct hv_send_ipi_ex *ipi_arg;
@@ -121,14 +122,27 @@ static bool __send_ipi_mask_ex(const struct cpumask *mask, int vector)
ipi_arg->reserved = 0;
ipi_arg->vp_set.valid_bank_mask = 0;
- if (!cpumask_equal(mask, cpu_present_mask)) {
+ /*
+ * Use HV_GENERIC_SET_ALL and avoid converting cpumask to VP_SET
+ * when the IPI is sent to all currently present CPUs.
+ */
+ if (!cpumask_equal(mask, cpu_present_mask) || exclude_self) {
ipi_arg->vp_set.format = HV_GENERIC_SET_SPARSE_4K;
- nr_bank = cpumask_to_vpset(&(ipi_arg->vp_set), mask);
- }
- if (nr_bank < 0)
- goto ipi_mask_ex_done;
- if (!nr_bank)
+ if (exclude_self)
+ nr_bank = cpumask_to_vpset_noself(&(ipi_arg->vp_set), mask);
+ else
+ nr_bank = cpumask_to_vpset(&(ipi_arg->vp_set), mask);
+
+ /*
+ * 'nr_bank <= 0' means some CPUs in cpumask can't be
+ * represented in VP_SET. Return an error and fall back to
+ * native (architectural) method of sending IPIs.
+ */
+ if (nr_bank <= 0)
+ goto ipi_mask_ex_done;
+ } else {
ipi_arg->vp_set.format = HV_GENERIC_SET_ALL;
+ }
status = hv_do_rep_hypercall(HVCALL_SEND_IPI_EX, 0, nr_bank,
ipi_arg, NULL);
@@ -138,15 +152,25 @@ ipi_mask_ex_done:
return hv_result_success(status);
}
-static bool __send_ipi_mask(const struct cpumask *mask, int vector)
+static bool __send_ipi_mask(const struct cpumask *mask, int vector,
+ bool exclude_self)
{
- int cur_cpu, vcpu;
+ int cur_cpu, vcpu, this_cpu = smp_processor_id();
struct hv_send_ipi ipi_arg;
u64 status;
+ unsigned int weight;
trace_hyperv_send_ipi_mask(mask, vector);
- if (cpumask_empty(mask))
+ weight = cpumask_weight(mask);
+
+ /*
+ * Do nothing if
+ * 1. the mask is empty
+ * 2. the mask only contains self when exclude_self is true
+ */
+ if (weight == 0 ||
+ (exclude_self && weight == 1 && cpumask_test_cpu(this_cpu, mask)))
return true;
if (!hv_hypercall_pg)
@@ -172,6 +196,8 @@ static bool __send_ipi_mask(const struct cpumask *mask, int vector)
ipi_arg.cpu_mask = 0;
for_each_cpu(cur_cpu, mask) {
+ if (exclude_self && cur_cpu == this_cpu)
+ continue;
vcpu = hv_cpu_number_to_vp_number(cur_cpu);
if (vcpu == VP_INVAL)
return false;
@@ -191,7 +217,7 @@ static bool __send_ipi_mask(const struct cpumask *mask, int vector)
return hv_result_success(status);
do_ex_hypercall:
- return __send_ipi_mask_ex(mask, vector);
+ return __send_ipi_mask_ex(mask, vector, exclude_self);
}
static bool __send_ipi_one(int cpu, int vector)
@@ -208,7 +234,7 @@ static bool __send_ipi_one(int cpu, int vector)
return false;
if (vp >= 64)
- return __send_ipi_mask_ex(cpumask_of(cpu), vector);
+ return __send_ipi_mask_ex(cpumask_of(cpu), vector, false);
status = hv_do_fast_hypercall16(HVCALL_SEND_IPI, vector, BIT_ULL(vp));
return hv_result_success(status);
@@ -222,20 +248,13 @@ static void hv_send_ipi(int cpu, int vector)
static void hv_send_ipi_mask(const struct cpumask *mask, int vector)
{
- if (!__send_ipi_mask(mask, vector))
+ if (!__send_ipi_mask(mask, vector, false))
orig_apic.send_IPI_mask(mask, vector);
}
static void hv_send_ipi_mask_allbutself(const struct cpumask *mask, int vector)
{
- unsigned int this_cpu = smp_processor_id();
- struct cpumask new_mask;
- const struct cpumask *local_mask;
-
- cpumask_copy(&new_mask, mask);
- cpumask_clear_cpu(this_cpu, &new_mask);
- local_mask = &new_mask;
- if (!__send_ipi_mask(local_mask, vector))
+ if (!__send_ipi_mask(mask, vector, true))
orig_apic.send_IPI_mask_allbutself(mask, vector);
}
@@ -246,7 +265,7 @@ static void hv_send_ipi_allbutself(int vector)
static void hv_send_ipi_all(int vector)
{
- if (!__send_ipi_mask(cpu_online_mask, vector))
+ if (!__send_ipi_mask(cpu_online_mask, vector, false))
orig_apic.send_IPI_all(vector);
}