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CONFIG_HAVE_KVM is currently used by some architectures to either
enabled the KVM config proper, or to enable host-side code that is
not part of the KVM module. However, CONFIG_KVM's "select" statement
in virt/kvm/Kconfig corresponds to a third meaning, namely to
enable common Kconfigs required by all architectures that support
KVM.
These three meanings can be replaced respectively by an
architecture-specific Kconfig, by IS_ENABLED(CONFIG_KVM), or by
a new Kconfig symbol that is in turn selected by the
architecture-specific "config KVM".
Start by introducing such a new Kconfig symbol, CONFIG_KVM_COMMON.
Unlike CONFIG_HAVE_KVM, it is selected by CONFIG_KVM, not by
architecture code, and it brings in all dependencies of common
KVM code. In particular, INTERVAL_TREE was missing in loongarch
and riscv, so that is another thing that is fixed.
Fixes: 8132d887a7 ("KVM: remove CONFIG_HAVE_KVM_EVENTFD", 2023-12-08)
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Closes: https://lore.kernel.org/all/44907c6b-c5bd-4e4a-a921-e4d3825539d8@infradead.org/
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
250 lines
7.5 KiB
Plaintext
250 lines
7.5 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0
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#
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# KVM configuration
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#
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source "virt/kvm/Kconfig"
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menuconfig VIRTUALIZATION
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bool "Virtualization"
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help
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Say Y here to get to see options for using your Linux host to run
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other operating systems inside virtual machines (guests).
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This option alone does not add any kernel code.
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If you say N, all options in this submenu will be skipped and
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disabled.
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if VIRTUALIZATION
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config KVM
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bool
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select KVM_COMMON
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select HAVE_KVM_VCPU_ASYNC_IOCTL
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select KVM_VFIO
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select IRQ_BYPASS_MANAGER
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select HAVE_KVM_IRQ_BYPASS
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config KVM_BOOK3S_HANDLER
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bool
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config KVM_BOOK3S_32_HANDLER
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bool
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select KVM_BOOK3S_HANDLER
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select KVM_MMIO
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config KVM_BOOK3S_64_HANDLER
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bool
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select KVM_BOOK3S_HANDLER
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config KVM_BOOK3S_PR_POSSIBLE
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bool
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select KVM_MMIO
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select KVM_GENERIC_MMU_NOTIFIER
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config KVM_BOOK3S_HV_POSSIBLE
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bool
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config KVM_BOOK3S_32
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tristate "KVM support for PowerPC book3s_32 processors"
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depends on PPC_BOOK3S_32 && !SMP && !PTE_64BIT
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depends on !CONTEXT_TRACKING_USER
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select KVM
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select KVM_BOOK3S_32_HANDLER
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select KVM_BOOK3S_PR_POSSIBLE
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select PPC_FPU
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help
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Support running unmodified book3s_32 guest kernels
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in virtual machines on book3s_32 host processors.
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This module provides access to the hardware capabilities through
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a character device node named /dev/kvm.
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If unsure, say N.
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config KVM_BOOK3S_64
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tristate "KVM support for PowerPC book3s_64 processors"
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depends on PPC_BOOK3S_64
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select KVM_BOOK3S_64_HANDLER
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select KVM
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select KVM_BOOK3S_PR_POSSIBLE if !KVM_BOOK3S_HV_POSSIBLE
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select PPC_64S_HASH_MMU
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select SPAPR_TCE_IOMMU if IOMMU_SUPPORT && (PPC_PSERIES || PPC_POWERNV)
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help
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Support running unmodified book3s_64 and book3s_32 guest kernels
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in virtual machines on book3s_64 host processors.
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This module provides access to the hardware capabilities through
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a character device node named /dev/kvm.
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If unsure, say N.
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config KVM_BOOK3S_64_HV
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tristate "KVM for POWER7 and later using hypervisor mode in host"
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depends on KVM_BOOK3S_64 && PPC_POWERNV
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select KVM_BOOK3S_HV_POSSIBLE
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select KVM_GENERIC_MMU_NOTIFIER
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select CMA
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help
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Support running unmodified book3s_64 guest kernels in
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virtual machines on POWER7 and newer processors that have
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hypervisor mode available to the host.
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If you say Y here, KVM will use the hardware virtualization
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facilities of POWER7 (and later) processors, meaning that
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guest operating systems will run at full hardware speed
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using supervisor and user modes. However, this also means
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that KVM is not usable under PowerVM (pHyp), is only usable
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on POWER7 or later processors, and cannot emulate a
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different processor from the host processor.
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If unsure, say N.
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config KVM_BOOK3S_64_PR
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tristate "KVM support without using hypervisor mode in host"
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depends on KVM_BOOK3S_64
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depends on !CONTEXT_TRACKING_USER
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select KVM_BOOK3S_PR_POSSIBLE
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help
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Support running guest kernels in virtual machines on processors
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without using hypervisor mode in the host, by running the
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guest in user mode (problem state) and emulating all
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privileged instructions and registers.
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This is only available for hash MMU mode and only supports
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guests that use hash MMU mode.
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This is not as fast as using hypervisor mode, but works on
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machines where hypervisor mode is not available or not usable,
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and can emulate processors that are different from the host
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processor, including emulating 32-bit processors on a 64-bit
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host.
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Selecting this option will cause the SCV facility to be
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disabled when the kernel is booted on the pseries platform in
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hash MMU mode (regardless of PR VMs running). When any PR VMs
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are running, "AIL" mode is disabled which may slow interrupts
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and system calls on the host.
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config KVM_BOOK3S_HV_EXIT_TIMING
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bool
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config KVM_BOOK3S_HV_P9_TIMING
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bool "Detailed timing for the P9 entry point"
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select KVM_BOOK3S_HV_EXIT_TIMING
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depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS
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help
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Calculate time taken for each vcpu during vcpu entry and
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exit, time spent inside the guest and time spent handling
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hypercalls and page faults. The total, minimum and maximum
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times in nanoseconds together with the number of executions
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are reported in debugfs in kvm/vm#/vcpu#/timings.
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If unsure, say N.
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config KVM_BOOK3S_HV_P8_TIMING
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bool "Detailed timing for hypervisor real-mode code (for POWER8)"
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select KVM_BOOK3S_HV_EXIT_TIMING
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depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS && !KVM_BOOK3S_HV_P9_TIMING
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help
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Calculate time taken for each vcpu in the real-mode guest entry,
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exit, and interrupt handling code, plus time spent in the guest
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and in nap mode due to idle (cede) while other threads are still
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in the guest. The total, minimum and maximum times in nanoseconds
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together with the number of executions are reported in debugfs in
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kvm/vm#/vcpu#/timings. The overhead is of the order of 30 - 40
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ns per exit on POWER8.
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If unsure, say N.
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config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND
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bool "Nested L0 host workaround for L1 KVM host PMU handling bug" if EXPERT
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depends on KVM_BOOK3S_HV_POSSIBLE
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default !EXPERT
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help
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Old nested HV capable Linux guests have a bug where they don't
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reflect the PMU in-use status of their L2 guest to the L0 host
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while the L2 PMU registers are live. This can result in loss
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of L2 PMU register state, causing perf to not work correctly in
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L2 guests.
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Selecting this option for the L0 host implements a workaround for
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those buggy L1s which saves the L2 state, at the cost of performance
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in all nested-capable guest entry/exit.
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config KVM_BOOKE_HV
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bool
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config KVM_EXIT_TIMING
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bool "Detailed exit timing"
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depends on KVM_E500V2 || KVM_E500MC
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help
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Calculate elapsed time for every exit/enter cycle. A per-vcpu
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report is available in debugfs kvm/vm#_vcpu#_timing.
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The overhead is relatively small, however it is not recommended for
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production environments.
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If unsure, say N.
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config KVM_E500V2
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bool "KVM support for PowerPC E500v2 processors"
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depends on PPC_E500 && !PPC_E500MC
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depends on !CONTEXT_TRACKING_USER
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select KVM
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select KVM_MMIO
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select KVM_GENERIC_MMU_NOTIFIER
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help
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Support running unmodified E500 guest kernels in virtual machines on
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E500v2 host processors.
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This module provides access to the hardware capabilities through
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a character device node named /dev/kvm.
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If unsure, say N.
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config KVM_E500MC
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bool "KVM support for PowerPC E500MC/E5500/E6500 processors"
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depends on PPC_E500MC
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depends on !CONTEXT_TRACKING_USER
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select KVM
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select KVM_MMIO
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select KVM_BOOKE_HV
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select KVM_GENERIC_MMU_NOTIFIER
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help
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Support running unmodified E500MC/E5500/E6500 guest kernels in
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virtual machines on E500MC/E5500/E6500 host processors.
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This module provides access to the hardware capabilities through
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a character device node named /dev/kvm.
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If unsure, say N.
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config KVM_MPIC
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bool "KVM in-kernel MPIC emulation"
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depends on KVM && PPC_E500
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select HAVE_KVM_IRQCHIP
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select HAVE_KVM_IRQ_ROUTING
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select HAVE_KVM_MSI
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help
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Enable support for emulating MPIC devices inside the
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host kernel, rather than relying on userspace to emulate.
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Currently, support is limited to certain versions of
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Freescale's MPIC implementation.
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config KVM_XICS
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bool "KVM in-kernel XICS emulation"
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depends on KVM_BOOK3S_64 && !KVM_MPIC
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select HAVE_KVM_IRQCHIP
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default y
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help
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Include support for the XICS (eXternal Interrupt Controller
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Specification) interrupt controller architecture used on
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IBM POWER (pSeries) servers.
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config KVM_XIVE
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bool
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default y
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depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE
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endif # VIRTUALIZATION
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