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After the vcpu_load/vcpu_put pushdown, the handling of asynchronous VCPU ioctl is already much clearer in that it is obvious that they bypass vcpu_load and vcpu_put. However, it is still not perfect in that the different state of the VCPU mutex is still hidden in the caller. Separate those ioctls into a new function kvm_arch_vcpu_async_ioctl that returns -ENOIOCTLCMD for more "traditional" synchronous ioctls. Cc: James Hogan <jhogan@kernel.org> Cc: Paul Mackerras <paulus@ozlabs.org> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Suggested-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
78 lines
2.0 KiB
Plaintext
78 lines
2.0 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 disabled.
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if VIRTUALIZATION
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config KVM
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tristate "Kernel-based Virtual Machine (KVM) support"
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depends on HAVE_KVM
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select EXPORT_UASM
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select PREEMPT_NOTIFIERS
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select ANON_INODES
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select KVM_GENERIC_DIRTYLOG_READ_PROTECT
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select HAVE_KVM_VCPU_ASYNC_IOCTL
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select KVM_MMIO
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select MMU_NOTIFIER
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select SRCU
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---help---
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Support for hosting Guest kernels.
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choice
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prompt "Virtualization mode"
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depends on KVM
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default KVM_MIPS_TE
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config KVM_MIPS_TE
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bool "Trap & Emulate"
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---help---
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Use trap and emulate to virtualize 32-bit guests in user mode. This
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does not require any special hardware Virtualization support beyond
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standard MIPS32/64 r2 or later, but it does require the guest kernel
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to be configured with CONFIG_KVM_GUEST=y so that it resides in the
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user address segment.
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config KVM_MIPS_VZ
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bool "MIPS Virtualization (VZ) ASE"
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---help---
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Use the MIPS Virtualization (VZ) ASE to virtualize guests. This
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supports running unmodified guest kernels (with CONFIG_KVM_GUEST=n),
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but requires hardware support.
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endchoice
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config KVM_MIPS_DYN_TRANS
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bool "KVM/MIPS: Dynamic binary translation to reduce traps"
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depends on KVM_MIPS_TE
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default y
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---help---
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When running in Trap & Emulate mode patch privileged
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instructions to reduce the number of traps.
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If unsure, say Y.
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config KVM_MIPS_DEBUG_COP0_COUNTERS
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bool "Maintain counters for COP0 accesses"
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depends on KVM
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---help---
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Maintain statistics for Guest COP0 accesses.
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A histogram of COP0 accesses is printed when the VM is
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shutdown.
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If unsure, say N.
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source drivers/vhost/Kconfig
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endif # VIRTUALIZATION
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