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x86/hyper-v: stash the max number of virtual/logical processor

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Max virtual processor will be needed for 'extended' hypercalls supporting
more than 64 vCPUs. While on it, unify on 'Hyper-V' in mshyperv.c as we
currently have a mix, report acquired misc features as well.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2017-06-25 10:06:41 -07:00 committed by Greg Kroah-Hartman
parent 2e252fbf77
commit dd018597a0
2 changed files with 11 additions and 3 deletions
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2
arch/x86/include/asm/mshyperv.h
View File

@ -28,6 +28,8 @@ struct ms_hyperv_info {
u32 features;
u32 misc_features;
u32 hints;
u32 max_vp_index;
u32 max_lp_index;
};
extern struct ms_hyperv_info ms_hyperv;

12
arch/x86/kernel/cpu/mshyperv.c
View File

@ -184,9 +184,15 @@ static void __init ms_hyperv_init_platform(void)
ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES);
ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
pr_info("HyperV: features 0x%x, hints 0x%x\n",
pr_info("Hyper-V: features 0x%x, hints 0x%x\n",
ms_hyperv.features, ms_hyperv.hints);
ms_hyperv.max_vp_index = cpuid_eax(HVCPUID_IMPLEMENTATION_LIMITS);
ms_hyperv.max_lp_index = cpuid_ebx(HVCPUID_IMPLEMENTATION_LIMITS);
pr_debug("Hyper-V: max %u virtual processors, %u logical processors\n",
ms_hyperv.max_vp_index, ms_hyperv.max_lp_index);
/*
* Extract host information.
*/
@ -219,7 +225,7 @@ static void __init ms_hyperv_init_platform(void)
rdmsrl(HV_X64_MSR_APIC_FREQUENCY, hv_lapic_frequency);
hv_lapic_frequency = div_u64(hv_lapic_frequency, HZ);
lapic_timer_frequency = hv_lapic_frequency;
pr_info("HyperV: LAPIC Timer Frequency: %#x\n",
pr_info("Hyper-V: LAPIC Timer Frequency: %#x\n",
lapic_timer_frequency);
}
@ -253,7 +259,7 @@ static void __init ms_hyperv_init_platform(void)
}
const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
.name = "Microsoft HyperV",
.name = "Microsoft Hyper-V",
.detect = ms_hyperv_platform,
.init_platform = ms_hyperv_init_platform,
};