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KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 00:28:06 +01:00
#
# 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 "Kernel-based Virtual Machine (KVM) support"
select PREEMPT_NOTIFIERS
select ANON_INODES
select KVM_MMIO
select KVM_ARM_HOST
depends on ARM_VIRT_EXT && ARM_LPAE
---help---
Support hosting virtualized guest machines. You will also
need to select one or more of the processor modules below.
This module provides access to the hardware capabilities through
a character device node named /dev/kvm.
If unsure, say N.
config KVM_ARM_HOST
bool "KVM host support for ARM cpus."
depends on KVM
depends on MMU
KVM: ARM: Memory virtualization setup This commit introduces the framework for guest memory management through the use of 2nd stage translation. Each VM has a pointer to a level-1 table (the pgd field in struct kvm_arch) which is used for the 2nd stage translations. Entries are added when handling guest faults (later patch) and the table itself can be allocated and freed through the following functions implemented in arch/arm/kvm/arm_mmu.c: - kvm_alloc_stage2_pgd(struct kvm *kvm); - kvm_free_stage2_pgd(struct kvm *kvm); Each entry in TLBs and caches are tagged with a VMID identifier in addition to ASIDs. The VMIDs are assigned consecutively to VMs in the order that VMs are executed, and caches and tlbs are invalidated when the VMID space has been used to allow for more than 255 simultaenously running guests. The 2nd stage pgd is allocated in kvm_arch_init_vm(). The table is freed in kvm_arch_destroy_vm(). Both functions are called from the main KVM code. We pre-allocate page table memory to be able to synchronize using a spinlock and be called under rcu_read_lock from the MMU notifiers. We steal the mmu_memory_cache implementation from x86 and adapt for our specific usage. We support MMU notifiers (thanks to Marc Zyngier) through kvm_unmap_hva and kvm_set_spte_hva. Finally, define kvm_phys_addr_ioremap() to map a device at a guest IPA, which is used by VGIC support to map the virtual CPU interface registers to the guest. This support is added by Marc Zyngier. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 00:28:07 +01:00
select MMU_NOTIFIER
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 00:28:06 +01:00
---help---
Provides host support for ARM processors.
config KVM_ARM_MAX_VCPUS
arm/kvm: Cleanup KVM_ARM_MAX_VCPUS logic Commit d21a1c83c7595e387545632e44cd7797b76e19cc (ARM: KVM: define KVM_ARM_MAX_VCPUS unconditionally) changed the Kconfig logic for KVM_ARM_MAX_VCPUS to work around a build error arising from the use of KVM_ARM_MAX_VCPUS when CONFIG_KVM=n. The resulting Kconfig logic is a bit awkward and leaves a KVM_ARM_MAX_VCPUS always defined in the kernel config file. This change reverts the Kconfig logic back and adds a simple preprocessor conditional in kvm_host.h to handle when CONFIG_KVM_ARM_MAX_VCPUS is undefined. Signed-off-by: Geoff Levand <geoff@infradead.org> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
2013-06-07 03:02:54 +02:00
int "Number maximum supported virtual CPUs per VM"
depends on KVM_ARM_HOST
default 4
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 00:28:06 +01:00
help
Static number of max supported virtual CPUs per VM.
If you choose a high number, the vcpu structures will be quite
large, so only choose a reasonable number that you expect to
actually use.
ARM: KVM: Add VGIC configuration option It is now possible to select the VGIC configuration option. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-01-22 01:36:16 +01:00
config KVM_ARM_VGIC
bool "KVM support for Virtual GIC"
depends on KVM_ARM_HOST && OF
select HAVE_KVM_IRQCHIP
default y
---help---
Adds support for a hardware assisted, in-kernel GIC emulation.
ARM: KVM: arch_timers: Wire the init code and config option It is now possible to select CONFIG_KVM_ARM_TIMER to enable the KVM architected timer support. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-01-23 19:21:59 +01:00
config KVM_ARM_TIMER
bool "KVM support for Architected Timers"
depends on KVM_ARM_VGIC && ARM_ARCH_TIMER
select HAVE_KVM_IRQCHIP
default y
---help---
Adds support for the Architected Timers in virtual machines
KVM: ARM: Initial skeleton to compile KVM support Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
2013-01-21 00:28:06 +01:00
endif # VIRTUALIZATION