From d8e6b232cfdd5d141c03e40a14c1c781480ea05e Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Fri, 22 Jun 2018 19:06:23 +0200 Subject: x86/hyper-v: Use 'fast' hypercall for HVCALL_SEND_IPI Current Hyper-V TLFS (v5.0b) claims that HvCallSendSyntheticClusterIpi hypercall can't be 'fast' (passing parameters through registers) but apparently this is not true, Windows always uses 'fast' version. We can do the same in Linux too. Signed-off-by: Vitaly Kuznetsov Signed-off-by: Thomas Gleixner Reviewed-by: Michael Kelley Cc: devel@linuxdriverproject.org Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: Stephen Hemminger Cc: "H. Peter Anvin" Cc: Tianyu Lan Cc: "Michael Kelley (EOSG)" Link: https://lkml.kernel.org/r/20180622170625.30688-3-vkuznets@redhat.com --- arch/x86/hyperv/hv_apic.c | 22 ++++++---------------- 1 file changed, 6 insertions(+), 16 deletions(-) (limited to 'arch/x86/hyperv') diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c index f68855499391..90055f89223b 100644 --- a/arch/x86/hyperv/hv_apic.c +++ b/arch/x86/hyperv/hv_apic.c @@ -128,10 +128,8 @@ ipi_mask_ex_done: static bool __send_ipi_mask(const struct cpumask *mask, int vector) { int cur_cpu, vcpu; - struct ipi_arg_non_ex **arg; - struct ipi_arg_non_ex *ipi_arg; + struct ipi_arg_non_ex ipi_arg; int ret = 1; - unsigned long flags; if (cpumask_empty(mask)) return true; @@ -145,16 +143,8 @@ static bool __send_ipi_mask(const struct cpumask *mask, int vector) 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); - - ipi_arg = *arg; - if (unlikely(!ipi_arg)) - goto ipi_mask_done; - - ipi_arg->vector = vector; - ipi_arg->reserved = 0; - ipi_arg->cpu_mask = 0; + ipi_arg.vector = vector; + ipi_arg.cpu_mask = 0; for_each_cpu(cur_cpu, mask) { vcpu = hv_cpu_number_to_vp_number(cur_cpu); @@ -165,13 +155,13 @@ static bool __send_ipi_mask(const struct cpumask *mask, int vector) if (vcpu >= 64) goto ipi_mask_done; - __set_bit(vcpu, (unsigned long *)&ipi_arg->cpu_mask); + __set_bit(vcpu, (unsigned long *)&ipi_arg.cpu_mask); } - ret = hv_do_hypercall(HVCALL_SEND_IPI, ipi_arg, NULL); + ret = hv_do_fast_hypercall16(HVCALL_SEND_IPI, ipi_arg.vector, + ipi_arg.cpu_mask); ipi_mask_done: - local_irq_restore(flags); return ((ret == 0) ? true : false); } -- cgit v1.2.3