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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d241aac798
On an (even slightly) oversubscribed system, spinlocks are quickly becoming a bottleneck, as some vcpus are spinning, waiting for a lock to be released, while the vcpu holding the lock may not be running at all. The solution is to trap blocking WFEs and tell KVM that we're now spinning. This ensures that other vpus will get a scheduling boost, allowing the lock to be released more quickly. Also, using CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT slightly improves the performance when the VM is severely overcommited. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
53 lines
1.1 KiB
Plaintext
53 lines
1.1 KiB
Plaintext
#
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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 "Kernel-based Virtual Machine (KVM) support"
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select MMU_NOTIFIER
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select PREEMPT_NOTIFIERS
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select ANON_INODES
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select HAVE_KVM_CPU_RELAX_INTERCEPT
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select KVM_MMIO
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select KVM_ARM_HOST
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select KVM_ARM_VGIC
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select KVM_ARM_TIMER
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---help---
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Support hosting virtualized guest machines.
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If unsure, say N.
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config KVM_ARM_HOST
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bool
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---help---
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Provides host support for ARM processors.
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config KVM_ARM_VGIC
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bool
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depends on KVM_ARM_HOST && OF
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select HAVE_KVM_IRQCHIP
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---help---
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Adds support for a hardware assisted, in-kernel GIC emulation.
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config KVM_ARM_TIMER
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bool
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depends on KVM_ARM_VGIC
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---help---
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Adds support for the Architected Timers in virtual machines.
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endif # VIRTUALIZATION
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