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Hyper-V host can suggest us to use hypercall for doing remote TLB flush,
this is supposed to work faster than IPIs.
Implementation details: to do HvFlushVirtualAddress{Space,List} hypercalls
we need to put the input somewhere in memory and we don't really want to
have memory allocation on each call so we pre-allocate per cpu memory areas
on boot.
pv_ops patching is happening very early so we need to separate
hyperv_setup_mmu_ops() and hyper_alloc_mmu().
It is possible and easy to implement local TLB flushing too and there is
even a hint for that. However, I don't see a room for optimization on the
host side as both hypercall and native tlb flush will result in vmexit. The
hint is also not set on modern Hyper-V versions.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Jork Loeser <Jork.Loeser@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Simon Xiao <sixiao@microsoft.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: devel@linuxdriverproject.org
Link: http://lkml.kernel.org/r/20170802160921.21791-8-vkuznets@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
27 lines
649 B
Plaintext
27 lines
649 B
Plaintext
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 && PCI && X86_LOCAL_APIC && HYPERVISOR_GUEST
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select PARAVIRT
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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_TSCPAGE
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def_bool HYPERV && X86_64
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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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