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KVM: arm/arm64: register irq bypass consumer on ARM/ARM64

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This patch selects IRQ_BYPASS_MANAGER and HAVE_KVM_IRQ_BYPASS
configs for ARM/ARM64.

kvm_arch_has_irq_bypass() now is implemented and returns true.
As a consequence the irq bypass consumer will be registered for
ARM/ARM64 with the forwarding callbacks:

- stop/start: halt/resume guest execution
- add/del_producer: set/unset forwarding at vgic/irqchip level

We don't have any actual support yet, so nothing gets actually
forwarded.

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Eric Auger <eric.auger@redhat.com>
[maz: dropped the DEOI stuff for the time being in order to
      reduce the dependency chain, amended commit message]
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Eric Auger 2017-10-27 15:28:31 +01:00 committed by Christoffer Dall
parent 80f77e54f1
commit 2412405b31
3 changed files with 46 additions and 0 deletions
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3
arch/arm/kvm/Kconfig
View File

@ -3,6 +3,7 @@
#
source "virt/kvm/Kconfig"
source "virt/lib/Kconfig"
menuconfig VIRTUALIZATION
bool "Virtualization"
@ -35,6 +36,8 @@ config KVM
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQ_ROUTING
select HAVE_KVM_MSI
select IRQ_BYPASS_MANAGER
select HAVE_KVM_IRQ_BYPASS
depends on ARM_VIRT_EXT && ARM_LPAE && ARM_ARCH_TIMER
---help---
Support hosting virtualized guest machines.

3
arch/arm64/kvm/Kconfig
View File

@ -3,6 +3,7 @@
#
source "virt/kvm/Kconfig"
source "virt/lib/Kconfig"
menuconfig VIRTUALIZATION
bool "Virtualization"
@ -35,6 +36,8 @@ config KVM
select HAVE_KVM_MSI
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQ_ROUTING
select IRQ_BYPASS_MANAGER
select HAVE_KVM_IRQ_BYPASS
---help---
Support hosting virtualized guest machines.
We don't support KVM with 16K page tables yet, due to the multiple

40
virt/kvm/arm/arm.c
View File

@ -27,6 +27,8 @@
#include <linux/mman.h>
#include <linux/sched.h>
#include <linux/kvm.h>
#include <linux/kvm_irqfd.h>
#include <linux/irqbypass.h>
#include <trace/events/kvm.h>
#include <kvm/arm_pmu.h>
@ -1458,6 +1460,44 @@ struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
return NULL;
}
bool kvm_arch_has_irq_bypass(void)
{
return true;
}
int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
struct irq_bypass_producer *prod)
{
struct kvm_kernel_irqfd *irqfd =
container_of(cons, struct kvm_kernel_irqfd, consumer);
return 0;
}
void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
struct irq_bypass_producer *prod)
{
struct kvm_kernel_irqfd *irqfd =
container_of(cons, struct kvm_kernel_irqfd, consumer);
return;
}
void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *cons)
{
struct kvm_kernel_irqfd *irqfd =
container_of(cons, struct kvm_kernel_irqfd, consumer);
kvm_arm_halt_guest(irqfd->kvm);
}
void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
{
struct kvm_kernel_irqfd *irqfd =
container_of(cons, struct kvm_kernel_irqfd, consumer);
kvm_arm_resume_guest(irqfd->kvm);
}
/**
* Initialize Hyp-mode and memory mappings on all CPUs.
*/