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KVM/arm fixes for 5.3, take #2

Browse source 
- Fix our system register reset so that we stop writing
   non-sensical values to them, and track which registers
   get reset instead.
 - Sync VMCR back from the GIC on WFI so that KVM has an
   exact vue of PMR.
 - Reevaluate state of HW-mapped, level triggered interrupts
   on enable.
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Merge tag 'kvmarm-fixes-for-5.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

KVM/arm fixes for 5.3, take #2

- Fix our system register reset so that we stop writing
  non-sensical values to them, and track which registers
  get reset instead.
- Sync VMCR back from the GIC on WFI so that KVM has an
  exact vue of PMR.
- Reevaluate state of HW-mapped, level triggered interrupts
  on enable.
This commit is contained in:
Paolo Bonzini 2019-08-09 16:53:50 +02:00
commit a738b5e75b
9 changed files with 88 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

11
virt/kvm/arm/arm.c
View file

@ -318,6 +318,17 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
{
/*
* If we're about to block (most likely because we've just hit a
* WFI), we need to sync back the state of the GIC CPU interface
* so that we have the lastest PMR and group enables. This ensures
* that kvm_arch_vcpu_runnable has up-to-date data to decide
* whether we have pending interrupts.
*/
preempt_disable();
kvm_vgic_vmcr_sync(vcpu);
preempt_enable();
kvm_vgic_v4_enable_doorbell(vcpu);
}

16
virt/kvm/arm/vgic/vgic-mmio.c
View file

@ -113,6 +113,22 @@ void vgic_mmio_write_senable(struct kvm_vcpu *vcpu,
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
raw_spin_lock_irqsave(&irq->irq_lock, flags);
if (vgic_irq_is_mapped_level(irq)) {
bool was_high = irq->line_level;
/*
* We need to update the state of the interrupt because
* the guest might have changed the state of the device
* while the interrupt was disabled at the VGIC level.
*/
irq->line_level = vgic_get_phys_line_level(irq);
/*
* Deactivate the physical interrupt so the GIC will let
* us know when it is asserted again.
*/
if (!irq->active && was_high && !irq->line_level)
vgic_irq_set_phys_active(irq, false);
}
irq->enabled = true;
vgic_queue_irq_unlock(vcpu->kvm, irq, flags);

9
virt/kvm/arm/vgic/vgic-v2.c
View file

@ -484,10 +484,17 @@ void vgic_v2_load(struct kvm_vcpu *vcpu)
kvm_vgic_global_state.vctrl_base + GICH_APR);
}
void vgic_v2_put(struct kvm_vcpu *vcpu)
void vgic_v2_vmcr_sync(struct kvm_vcpu *vcpu)
{
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
cpu_if->vgic_vmcr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_VMCR);
}
void vgic_v2_put(struct kvm_vcpu *vcpu)
{
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
vgic_v2_vmcr_sync(vcpu);
cpu_if->vgic_apr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_APR);
}

7
virt/kvm/arm/vgic/vgic-v3.c
View file

@ -662,12 +662,17 @@ void vgic_v3_load(struct kvm_vcpu *vcpu)
__vgic_v3_activate_traps(vcpu);
}
void vgic_v3_put(struct kvm_vcpu *vcpu)
void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu)
{
struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
if (likely(cpu_if->vgic_sre))
cpu_if->vgic_vmcr = kvm_call_hyp_ret(__vgic_v3_read_vmcr);
}
void vgic_v3_put(struct kvm_vcpu *vcpu)
{
vgic_v3_vmcr_sync(vcpu);
kvm_call_hyp(__vgic_v3_save_aprs, vcpu);

11
virt/kvm/arm/vgic/vgic.c
View file

@ -919,6 +919,17 @@ void kvm_vgic_put(struct kvm_vcpu *vcpu)
vgic_v3_put(vcpu);
}
void kvm_vgic_vmcr_sync(struct kvm_vcpu *vcpu)
{
if (unlikely(!irqchip_in_kernel(vcpu->kvm)))
return;
if (kvm_vgic_global_state.type == VGIC_V2)
vgic_v2_vmcr_sync(vcpu);
else
vgic_v3_vmcr_sync(vcpu);
}
int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;

2
virt/kvm/arm/vgic/vgic.h
View file

@ -193,6 +193,7 @@ int vgic_register_dist_iodev(struct kvm *kvm, gpa_t dist_base_address,
void vgic_v2_init_lrs(void);
void vgic_v2_load(struct kvm_vcpu *vcpu);
void vgic_v2_put(struct kvm_vcpu *vcpu);
void vgic_v2_vmcr_sync(struct kvm_vcpu *vcpu);
void vgic_v2_save_state(struct kvm_vcpu *vcpu);
void vgic_v2_restore_state(struct kvm_vcpu *vcpu);
@ -223,6 +224,7 @@ bool vgic_v3_check_base(struct kvm *kvm);
void vgic_v3_load(struct kvm_vcpu *vcpu);
void vgic_v3_put(struct kvm_vcpu *vcpu);
void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu);
bool vgic_has_its(struct kvm *kvm);
int kvm_vgic_register_its_device(void);