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3e2d94535a
There is no particular reason to not enable TSC page clocksource on 32-bit. mul_u64_u64_shr() is available and despite the increased computational complexity (compared to 64bit) TSC page is still a huge win compared to MSR-based clocksource. In-kernel reads: MSR based clocksource: 3361 cycles TSC page clocksource: 49 cycles Reads from userspace (utilizing vDSO in case of TSC page): MSR based clocksource: 5664 cycles TSC page clocksource: 131 cycles Enabling TSC page on 32bits allows to get rid of CONFIG_HYPERV_TSCPAGE as it is now not any different from CONFIG_HYPERV_TIMER. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Link: https://lkml.kernel.org/r/20190822083630.17059-1-vkuznets@redhat.com
30 lines
691 B
Plaintext
30 lines
691 B
Plaintext
# SPDX-License-Identifier: GPL-2.0
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menu "Microsoft Hyper-V guest support"
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config HYPERV
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tristate "Microsoft Hyper-V client drivers"
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depends on X86 && ACPI && X86_LOCAL_APIC && HYPERVISOR_GUEST
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select PARAVIRT
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select X86_HV_CALLBACK_VECTOR
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help
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Select this option to run Linux as a Hyper-V client operating
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system.
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config HYPERV_TIMER
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def_bool HYPERV
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config HYPERV_UTILS
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tristate "Microsoft Hyper-V Utilities driver"
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depends on HYPERV && CONNECTOR && NLS
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help
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Select this option to enable the Hyper-V Utilities.
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config HYPERV_BALLOON
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tristate "Microsoft Hyper-V Balloon driver"
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depends on HYPERV
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help
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Select this option to enable Hyper-V Balloon driver.
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endmenu
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