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X86/Hyper-V: Enhanced IPI enlightenment

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Support enhanced IPI enlightenments (to target more than 64 CPUs).

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Cc: olaf@aepfle.de
Cc: sthemmin@microsoft.com
Cc: gregkh@linuxfoundation.org
Cc: jasowang@redhat.com
Cc: Michael.H.Kelley@microsoft.com
Cc: hpa@zytor.com
Cc: apw@canonical.com
Cc: devel@linuxdriverproject.org
Cc: vkuznets@redhat.com
Link: https://lkml.kernel.org/r/20180516215334.6547-3-kys@linuxonhyperv.com
This commit is contained in:
K. Y. Srinivasan
2018-05-16 14:53:32 -07:00
committed by Thomas Gleixner
parent 68bb7bfb79
commit 366f03b0cf
4 changed files with 89 additions and 3 deletions
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42
arch/x86/hyperv/hv_apic.c
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@@ -93,6 +93,40 @@ 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)
{
struct ipi_arg_ex **arg;
struct ipi_arg_ex *ipi_arg;
unsigned long flags;
int nr_bank = 0;
int ret = 1;
local_irq_save(flags);
arg = (struct ipi_arg_ex **)this_cpu_ptr(hyperv_pcpu_input_arg);
ipi_arg = *arg;
if (unlikely(!ipi_arg))
goto ipi_mask_ex_done;
ipi_arg->vector = vector;
ipi_arg->reserved = 0;
ipi_arg->vp_set.valid_bank_mask = 0;
if (!cpumask_equal(mask, cpu_present_mask)) {
ipi_arg->vp_set.format = HV_GENERIC_SET_SPARSE_4K;
nr_bank = cpumask_to_vpset(&(ipi_arg->vp_set), mask);
}
if (!nr_bank)
ipi_arg->vp_set.format = HV_GENERIC_SET_ALL;
ret = hv_do_rep_hypercall(HVCALL_SEND_IPI_EX, 0, nr_bank,
ipi_arg, NULL);
ipi_mask_ex_done:
local_irq_restore(flags);
return ((ret == 0) ? true : false);
}
static bool __send_ipi_mask(const struct cpumask *mask, int vector)
{
int cur_cpu, vcpu;
@@ -110,6 +144,9 @@ static bool __send_ipi_mask(const struct cpumask *mask, int vector)
if ((vector < HV_IPI_LOW_VECTOR) || (vector > HV_IPI_HIGH_VECTOR))
return false;
if ((ms_hyperv.hints & HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED))
return __send_ipi_mask_ex(mask, vector);
local_irq_save(flags);
arg = (struct ipi_arg_non_ex **)this_cpu_ptr(hyperv_pcpu_input_arg);
@@ -193,7 +230,10 @@ static void hv_send_ipi_self(int vector)
void __init hv_apic_init(void)
{
if (ms_hyperv.hints & HV_X64_CLUSTER_IPI_RECOMMENDED) {
pr_info("Hyper-V: Using IPI hypercalls\n");
if ((ms_hyperv.hints & HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED))
pr_info("Hyper-V: Using ext hypercalls for IPI\n");
else
pr_info("Hyper-V: Using IPI hypercalls\n");
/*
* Set the IPI entry points.
*/