arch/powerpc/kvm/Kconfig - third_party/linux - Git at Google


            
            # SPDX-License-Identifier: GPL-2.0

            
            #

            
            # KVM configuration

            
            #


            source "virt/kvm/Kconfig"


            menuconfig VIRTUALIZATION

            
            	bool "Virtualization"

            
            	help

            
            	  Say Y here to get to see options for using your Linux host to run

            
            	  other operating systems inside virtual machines (guests).

            
            	  This option alone does not add any kernel code.


            	  If you say N, all options in this submenu will be skipped and

            
            	  disabled.


            if VIRTUALIZATION


            config KVM

            
            	bool

            
            	select KVM_COMMON

            
            	select KVM_VFIO

            
            	select HAVE_KVM_IRQ_BYPASS


            config KVM_BOOK3S_HANDLER

            
            	bool


            config KVM_BOOK3S_32_HANDLER

            
            	bool

            
            	select KVM_BOOK3S_HANDLER

            
            	select KVM_MMIO


            config KVM_BOOK3S_64_HANDLER

            
            	bool

            
            	select KVM_BOOK3S_HANDLER


            config KVM_BOOK3S_PR_POSSIBLE

            
            	bool

            
            	select KVM_MMIO


            config KVM_BOOK3S_HV_POSSIBLE

            
            	bool


            config KVM_BOOK3S_32

            
            	tristate "KVM support for PowerPC book3s_32 processors"

            
            	depends on PPC_BOOK3S_32 && !SMP && !PTE_64BIT

            
            	depends on !CONTEXT_TRACKING_USER

            
            	select KVM

            
            	select KVM_BOOK3S_32_HANDLER

            
            	select KVM_BOOK3S_PR_POSSIBLE

            
            	select PPC_FPU

            
            	help

            
            	  Support running unmodified book3s_32 guest kernels

            
            	  in virtual machines on book3s_32 host processors.


            	  This module provides access to the hardware capabilities through

            
            	  a character device node named /dev/kvm.


            	  If unsure, say N.


            config KVM_BOOK3S_64

            
            	tristate "KVM support for PowerPC book3s_64 processors"

            
            	depends on PPC_BOOK3S_64

            
            	select KVM_BOOK3S_64_HANDLER

            
            	select KVM

            
            	select KVM_BOOK3S_PR_POSSIBLE if !KVM_BOOK3S_HV_POSSIBLE

            
            	select PPC_64S_HASH_MMU

            
            	select SPAPR_TCE_IOMMU if IOMMU_SUPPORT && (PPC_PSERIES || PPC_POWERNV)

            
            	help

            
            	  Support running unmodified book3s_64 and book3s_32 guest kernels

            
            	  in virtual machines on book3s_64 host processors.


            	  This module provides access to the hardware capabilities through

            
            	  a character device node named /dev/kvm.


            	  If unsure, say N.


            config KVM_BOOK3S_64_HV

            
            	tristate "KVM for POWER7 and later using hypervisor mode in host"

            
            	depends on KVM_BOOK3S_64 && PPC_POWERNV

            
            	select KVM_BOOK3S_HV_POSSIBLE

            
            	select KVM_BOOK3S_HV_PMU

            
            	select CMA

            
            	help

            
            	  Support running unmodified book3s_64 guest kernels in

            
            	  virtual machines on POWER7 and newer processors that have

            
            	  hypervisor mode available to the host.


            	  If you say Y here, KVM will use the hardware virtualization

            
            	  facilities of POWER7 (and later) processors, meaning that

            
            	  guest operating systems will run at full hardware speed

            
            	  using supervisor and user modes.  However, this also means

            
            	  that KVM is not usable under PowerVM (pHyp), is only usable

            
            	  on POWER7 or later processors, and cannot emulate a

            
            	  different processor from the host processor.


            	  If unsure, say N.


            config KVM_BOOK3S_64_PR

            
            	tristate "KVM support without using hypervisor mode in host"

            
            	depends on KVM_BOOK3S_64

            
            	depends on !CONTEXT_TRACKING_USER

            
            	select KVM_BOOK3S_PR_POSSIBLE

            
            	help

            
            	  Support running guest kernels in virtual machines on processors

            
            	  without using hypervisor mode in the host, by running the

            
            	  guest in user mode (problem state) and emulating all

            
            	  privileged instructions and registers.


            	  This is only available for hash MMU mode and only supports

            
            	  guests that use hash MMU mode.


            	  This is not as fast as using hypervisor mode, but works on

            
            	  machines where hypervisor mode is not available or not usable,

            
            	  and can emulate processors that are different from the host

            
            	  processor, including emulating 32-bit processors on a 64-bit

            
            	  host.


            	  Selecting this option will cause the SCV facility to be

            
            	  disabled when the kernel is booted on the pseries platform in

            
            	  hash MMU mode (regardless of PR VMs running). When any PR VMs

            
            	  are running, "AIL" mode is disabled which may slow interrupts

            
            	  and system calls on the host.


            config KVM_BOOK3S_HV_EXIT_TIMING

            
            	bool


            config KVM_BOOK3S_HV_P9_TIMING

            
            	bool "Detailed timing for the P9 entry point"

            
            	select KVM_BOOK3S_HV_EXIT_TIMING

            
            	depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS

            
            	help

            
            	  Calculate time taken for each vcpu during vcpu entry and

            
            	  exit, time spent inside the guest and time spent handling

            
            	  hypercalls and page faults. The total, minimum and maximum

            
            	  times in nanoseconds together with the number of executions

            
            	  are reported in debugfs in kvm/vm#/vcpu#/timings.


            	  If unsure, say N.


            config KVM_BOOK3S_HV_P8_TIMING

            
            	bool "Detailed timing for hypervisor real-mode code (for POWER8)"

            
            	select KVM_BOOK3S_HV_EXIT_TIMING

            
            	depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS && !KVM_BOOK3S_HV_P9_TIMING

            
            	help

            
            	  Calculate time taken for each vcpu in the real-mode guest entry,

            
            	  exit, and interrupt handling code, plus time spent in the guest

            
            	  and in nap mode due to idle (cede) while other threads are still

            
            	  in the guest.  The total, minimum and maximum times in nanoseconds

            
            	  together with the number of executions are reported in debugfs in

            
            	  kvm/vm#/vcpu#/timings.  The overhead is of the order of 30 - 40

            
            	  ns per exit on POWER8.


            	  If unsure, say N.


            config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND

            
            	bool "Nested L0 host workaround for L1 KVM host PMU handling bug" if EXPERT

            
            	depends on KVM_BOOK3S_HV_POSSIBLE

            
            	default !EXPERT

            
            	help

            
            	  Old nested HV capable Linux guests have a bug where they don't

            
            	  reflect the PMU in-use status of their L2 guest to the L0 host

            
            	  while the L2 PMU registers are live. This can result in loss

            
            	  of L2 PMU register state, causing perf to not work correctly in

            
            	  L2 guests.


            	  Selecting this option for the L0 host implements a workaround for

            
            	  those buggy L1s which saves the L2 state, at the cost of performance

            
            	  in all nested-capable guest entry/exit.


            config KVM_BOOK3S_HV_PMU

            
            	tristate "Hypervisor Perf events for KVM Book3s-HV"

            
            	depends on KVM_BOOK3S_64_HV

            
            	help

            
            	  Enable Book3s-HV Hypervisor Perf events PMU named 'kvm-hv'. These

            
            	  Perf events give an overview of hypervisor performance overall

            
            	  instead of a specific guests. Currently the PMU reports

            
            	  L0-Hypervisor stats on a kvm-hv enabled PSeries LPAR like:

            
            	  * Total/Used Guest-Heap

            
            	  * Total/Used Guest Page-table Memory

            
            	  * Total amount of Guest Page-table Memory reclaimed


            config KVM_BOOKE_HV

            
            	bool


            config KVM_EXIT_TIMING

            
            	bool "Detailed exit timing"

            
            	depends on KVM_E500V2 || KVM_E500MC

            
            	help

            
            	  Calculate elapsed time for every exit/enter cycle. A per-vcpu

            
            	  report is available in debugfs kvm/vm#_vcpu#_timing.

            
            	  The overhead is relatively small, however it is not recommended for

            
            	  production environments.


            	  If unsure, say N.


            config KVM_E500V2

            
            	bool "KVM support for PowerPC E500v2 processors"

            
            	depends on PPC_E500 && !PPC_E500MC

            
            	depends on !CONTEXT_TRACKING_USER

            
            	select KVM

            
            	select KVM_MMIO

            
            	help

            
            	  Support running unmodified E500 guest kernels in virtual machines on

            
            	  E500v2 host processors.


            	  This module provides access to the hardware capabilities through

            
            	  a character device node named /dev/kvm.


            	  If unsure, say N.


            config KVM_E500MC

            
            	bool "KVM support for PowerPC E500MC/E5500/E6500 processors"

            
            	depends on PPC_E500MC

            
            	depends on !CONTEXT_TRACKING_USER

            
            	select KVM

            
            	select KVM_MMIO

            
            	select KVM_BOOKE_HV

            
            	help

            
            	  Support running unmodified E500MC/E5500/E6500 guest kernels in

            
            	  virtual machines on E500MC/E5500/E6500 host processors.


            	  This module provides access to the hardware capabilities through

            
            	  a character device node named /dev/kvm.


            	  If unsure, say N.


            config KVM_MPIC

            
            	bool "KVM in-kernel MPIC emulation"

            
            	depends on KVM && PPC_E500

            
            	select HAVE_KVM_IRQCHIP

            
            	select HAVE_KVM_IRQ_ROUTING

            
            	select HAVE_KVM_MSI

            
            	help

            
            	  Enable support for emulating MPIC devices inside the

            
            	  host kernel, rather than relying on userspace to emulate.

            
            	  Currently, support is limited to certain versions of

            
            	  Freescale's MPIC implementation.


            config KVM_XICS

            
            	bool "KVM in-kernel XICS emulation"

            
            	depends on KVM_BOOK3S_64 && !KVM_MPIC

            
            	select HAVE_KVM_IRQCHIP

            
            	default y

            
            	help

            
            	  Include support for the XICS (eXternal Interrupt Controller

            
            	  Specification) interrupt controller architecture used on

            
            	  IBM POWER (pSeries) servers.


            config KVM_XIVE

            
            	bool

            
            	default y

            
            	depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE


            endif # VIRTUALIZATION
	# SPDX-License-Identifier: GPL-2.0
	#
	# KVM configuration
	#

	source "virt/kvm/Kconfig"

	menuconfig VIRTUALIZATION
	bool "Virtualization"
	help
	Say Y here to get to see options for using your Linux host to run
	other operating systems inside virtual machines (guests).
	This option alone does not add any kernel code.

	If you say N, all options in this submenu will be skipped and
	disabled.

	if VIRTUALIZATION

	config KVM
	bool
	select KVM_COMMON
	select KVM_VFIO
	select HAVE_KVM_IRQ_BYPASS

	config KVM_BOOK3S_HANDLER
	bool

	config KVM_BOOK3S_32_HANDLER
	bool
	select KVM_BOOK3S_HANDLER
	select KVM_MMIO

	config KVM_BOOK3S_64_HANDLER
	bool
	select KVM_BOOK3S_HANDLER

	config KVM_BOOK3S_PR_POSSIBLE
	bool
	select KVM_MMIO

	config KVM_BOOK3S_HV_POSSIBLE
	bool

	config KVM_BOOK3S_32
	tristate "KVM support for PowerPC book3s_32 processors"
	depends on PPC_BOOK3S_32 && !SMP && !PTE_64BIT
	depends on !CONTEXT_TRACKING_USER
	select KVM
	select KVM_BOOK3S_32_HANDLER
	select KVM_BOOK3S_PR_POSSIBLE
	select PPC_FPU
	help
	Support running unmodified book3s_32 guest kernels
	in virtual machines on book3s_32 host processors.

	This module provides access to the hardware capabilities through
	a character device node named /dev/kvm.

	If unsure, say N.

	config KVM_BOOK3S_64
	tristate "KVM support for PowerPC book3s_64 processors"
	depends on PPC_BOOK3S_64
	select KVM_BOOK3S_64_HANDLER
	select KVM
	select KVM_BOOK3S_PR_POSSIBLE if !KVM_BOOK3S_HV_POSSIBLE
	select PPC_64S_HASH_MMU
	select SPAPR_TCE_IOMMU if IOMMU_SUPPORT && (PPC_PSERIES \|\| PPC_POWERNV)
	help
	Support running unmodified book3s_64 and book3s_32 guest kernels
	in virtual machines on book3s_64 host processors.

	This module provides access to the hardware capabilities through
	a character device node named /dev/kvm.

	If unsure, say N.

	config KVM_BOOK3S_64_HV
	tristate "KVM for POWER7 and later using hypervisor mode in host"
	depends on KVM_BOOK3S_64 && PPC_POWERNV
	select KVM_BOOK3S_HV_POSSIBLE
	select KVM_BOOK3S_HV_PMU
	select CMA
	help
	Support running unmodified book3s_64 guest kernels in
	virtual machines on POWER7 and newer processors that have
	hypervisor mode available to the host.

	If you say Y here, KVM will use the hardware virtualization
	facilities of POWER7 (and later) processors, meaning that
	guest operating systems will run at full hardware speed
	using supervisor and user modes. However, this also means
	that KVM is not usable under PowerVM (pHyp), is only usable
	on POWER7 or later processors, and cannot emulate a
	different processor from the host processor.

	If unsure, say N.

	config KVM_BOOK3S_64_PR
	tristate "KVM support without using hypervisor mode in host"
	depends on KVM_BOOK3S_64
	depends on !CONTEXT_TRACKING_USER
	select KVM_BOOK3S_PR_POSSIBLE
	help
	Support running guest kernels in virtual machines on processors
	without using hypervisor mode in the host, by running the
	guest in user mode (problem state) and emulating all
	privileged instructions and registers.

	This is only available for hash MMU mode and only supports
	guests that use hash MMU mode.

	This is not as fast as using hypervisor mode, but works on
	machines where hypervisor mode is not available or not usable,
	and can emulate processors that are different from the host
	processor, including emulating 32-bit processors on a 64-bit
	host.

	Selecting this option will cause the SCV facility to be
	disabled when the kernel is booted on the pseries platform in
	hash MMU mode (regardless of PR VMs running). When any PR VMs
	are running, "AIL" mode is disabled which may slow interrupts
	and system calls on the host.

	config KVM_BOOK3S_HV_EXIT_TIMING
	bool

	config KVM_BOOK3S_HV_P9_TIMING
	bool "Detailed timing for the P9 entry point"
	select KVM_BOOK3S_HV_EXIT_TIMING
	depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS
	help
	Calculate time taken for each vcpu during vcpu entry and
	exit, time spent inside the guest and time spent handling
	hypercalls and page faults. The total, minimum and maximum
	times in nanoseconds together with the number of executions
	are reported in debugfs in kvm/vm#/vcpu#/timings.

	If unsure, say N.

	config KVM_BOOK3S_HV_P8_TIMING
	bool "Detailed timing for hypervisor real-mode code (for POWER8)"
	select KVM_BOOK3S_HV_EXIT_TIMING
	depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS && !KVM_BOOK3S_HV_P9_TIMING
	help
	Calculate time taken for each vcpu in the real-mode guest entry,
	exit, and interrupt handling code, plus time spent in the guest
	and in nap mode due to idle (cede) while other threads are still
	in the guest. The total, minimum and maximum times in nanoseconds
	together with the number of executions are reported in debugfs in
	kvm/vm#/vcpu#/timings. The overhead is of the order of 30 - 40
	ns per exit on POWER8.

	If unsure, say N.

	config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND
	bool "Nested L0 host workaround for L1 KVM host PMU handling bug" if EXPERT
	depends on KVM_BOOK3S_HV_POSSIBLE
	default !EXPERT
	help
	Old nested HV capable Linux guests have a bug where they don't
	reflect the PMU in-use status of their L2 guest to the L0 host
	while the L2 PMU registers are live. This can result in loss
	of L2 PMU register state, causing perf to not work correctly in
	L2 guests.

	Selecting this option for the L0 host implements a workaround for
	those buggy L1s which saves the L2 state, at the cost of performance
	in all nested-capable guest entry/exit.

	config KVM_BOOK3S_HV_PMU
	tristate "Hypervisor Perf events for KVM Book3s-HV"
	depends on KVM_BOOK3S_64_HV
	help
	Enable Book3s-HV Hypervisor Perf events PMU named 'kvm-hv'. These
	Perf events give an overview of hypervisor performance overall
	instead of a specific guests. Currently the PMU reports
	L0-Hypervisor stats on a kvm-hv enabled PSeries LPAR like:
	* Total/Used Guest-Heap
	* Total/Used Guest Page-table Memory
	* Total amount of Guest Page-table Memory reclaimed

	config KVM_BOOKE_HV
	bool

	config KVM_EXIT_TIMING
	bool "Detailed exit timing"
	depends on KVM_E500V2 \|\| KVM_E500MC
	help
	Calculate elapsed time for every exit/enter cycle. A per-vcpu
	report is available in debugfs kvm/vm#_vcpu#_timing.
	The overhead is relatively small, however it is not recommended for
	production environments.

	If unsure, say N.

	config KVM_E500V2
	bool "KVM support for PowerPC E500v2 processors"
	depends on PPC_E500 && !PPC_E500MC
	depends on !CONTEXT_TRACKING_USER
	select KVM
	select KVM_MMIO
	help
	Support running unmodified E500 guest kernels in virtual machines on
	E500v2 host processors.

	This module provides access to the hardware capabilities through
	a character device node named /dev/kvm.

	If unsure, say N.

	config KVM_E500MC
	bool "KVM support for PowerPC E500MC/E5500/E6500 processors"
	depends on PPC_E500MC
	depends on !CONTEXT_TRACKING_USER
	select KVM
	select KVM_MMIO
	select KVM_BOOKE_HV
	help
	Support running unmodified E500MC/E5500/E6500 guest kernels in
	virtual machines on E500MC/E5500/E6500 host processors.

	This module provides access to the hardware capabilities through
	a character device node named /dev/kvm.

	If unsure, say N.

	config KVM_MPIC
	bool "KVM in-kernel MPIC emulation"
	depends on KVM && PPC_E500
	select HAVE_KVM_IRQCHIP
	select HAVE_KVM_IRQ_ROUTING
	select HAVE_KVM_MSI
	help
	Enable support for emulating MPIC devices inside the
	host kernel, rather than relying on userspace to emulate.
	Currently, support is limited to certain versions of
	Freescale's MPIC implementation.

	config KVM_XICS
	bool "KVM in-kernel XICS emulation"
	depends on KVM_BOOK3S_64 && !KVM_MPIC
	select HAVE_KVM_IRQCHIP
	default y
	help
	Include support for the XICS (eXternal Interrupt Controller
	Specification) interrupt controller architecture used on
	IBM POWER (pSeries) servers.

	config KVM_XIVE
	bool
	default y
	depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE

	endif # VIRTUALIZATION