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Date: Wed, 24 May 2017 14:03:57 +0200 From: Vitaly Kuznetsov <vkuznets@...hat.com> To: devel@...uxdriverproject.org, x86@...nel.org Cc: linux-kernel@...r.kernel.org, "K. Y. Srinivasan" <kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Stephen Hemminger <sthemmin@...rosoft.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, Steven Rostedt <rostedt@...dmis.org>, Jork Loeser <Jork.Loeser@...rosoft.com>, Simon Xiao <sixiao@...rosoft.com>, Andy Lutomirski <luto@...nel.org> Subject: [PATCH v4 02/10] x86/hyper-v: stash the max number of virtual/logical processor 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@...hat.com> Acked-by: K. Y. Srinivasan <kys@...rosoft.com> Tested-by: Simon Xiao <sixiao@...rosoft.com> Tested-by: Srikanth Myakam <v-srm@...rosoft.com> --- arch/x86/include/asm/mshyperv.h | 2 ++ arch/x86/kernel/cpu/mshyperv.c | 13 ++++++++++--- 2 files changed, 12 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 91acec7..d42b6eb 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -29,6 +29,8 @@ 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; diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 04cb8d3..a8b4765 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -175,9 +175,16 @@ 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_info("Hyper-V: max %d virtual processors, %d logical processors\n", + ms_hyperv.max_vp_index, ms_hyperv.max_lp_index); + + /* * Extract host information. */ @@ -203,7 +210,7 @@ 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); } @@ -237,7 +244,7 @@ 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, }; -- 2.9.4
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