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X86/Hyper-V: Enhanced IPI enlightenment 

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
hifive-unleashed-5.1
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
View File

@ -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.
*/

2
arch/x86/hyperv/mmu.c
View File

@ -239,7 +239,7 @@ static void hyperv_flush_tlb_others_ex(const struct cpumask *cpus,
flush->hv_vp_set.valid_bank_mask = 0;
if (!cpumask_equal(cpus, cpu_present_mask)) {
flush->hv_vp_set.format = HV_GENERIC_SET_SPARCE_4K;
flush->hv_vp_set.format = HV_GENERIC_SET_SPARSE_4K;
nr_bank = cpumask_to_vp_set(flush, cpus);
}

15
arch/x86/include/asm/hyperv-tlfs.h
View File

@ -344,6 +344,7 @@ struct hv_tsc_emulation_status {
#define HVCALL_SEND_IPI 0x000b
#define HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX 0x0013
#define HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX 0x0014
#define HVCALL_SEND_IPI_EX 0x0015
#define HVCALL_POST_MESSAGE 0x005c
#define HVCALL_SIGNAL_EVENT 0x005d
@ -369,7 +370,7 @@ struct hv_tsc_emulation_status {
#define HV_FLUSH_USE_EXTENDED_RANGE_FORMAT BIT(3)
enum HV_GENERIC_SET_FORMAT {
HV_GENERIC_SET_SPARCE_4K,
HV_GENERIC_SET_SPARSE_4K,
HV_GENERIC_SET_ALL,
};
@ -721,4 +722,16 @@ struct ipi_arg_non_ex {
u64 cpu_mask;
};
struct hv_vpset {
u64 format;
u64 valid_bank_mask;
u64 bank_contents[];
};
struct ipi_arg_ex {
u32 vector;
u32 reserved;
struct hv_vpset vp_set;
};
#endif

33
arch/x86/include/asm/mshyperv.h
View File

@ -259,6 +259,39 @@ static inline int hv_cpu_number_to_vp_number(int cpu_number)
return hv_vp_index[cpu_number];
}
static inline int cpumask_to_vpset(struct hv_vpset *vpset,
const struct cpumask *cpus)
{
int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1;
/* valid_bank_mask can represent up to 64 banks */
if (hv_max_vp_index / 64 >= 64)
return 0;
/*
* Clear all banks up to the maximum possible bank as hv_flush_pcpu_ex
* structs are not cleared between calls, we risk flushing unneeded
* vCPUs otherwise.
*/
for (vcpu_bank = 0; vcpu_bank <= hv_max_vp_index / 64; vcpu_bank++)
vpset->bank_contents[vcpu_bank] = 0;
/*
* Some banks may end up being empty but this is acceptable.
*/
for_each_cpu(cpu, cpus) {
vcpu = hv_cpu_number_to_vp_number(cpu);
vcpu_bank = vcpu / 64;
vcpu_offset = vcpu % 64;
__set_bit(vcpu_offset, (unsigned long *)
&vpset->bank_contents[vcpu_bank]);
if (vcpu_bank >= nr_bank)
nr_bank = vcpu_bank + 1;
}
vpset->valid_bank_mask = GENMASK_ULL(nr_bank - 1, 0);
return nr_bank;
}
void __init hyperv_init(void);
void hyperv_setup_mmu_ops(void);
void hyper_alloc_mmu(void);