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KVM: arm64: vgic-v3: KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES

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This patch adds a new attribute to GICV3 KVM device
KVM_DEV_ARM_VGIC_GRP_CTRL group. This allows userspace to
flush all GICR pending tables into guest RAM.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Eric Auger 2017-01-09 16:28:27 +01:00 committed by Christoffer Dall
parent ccb1d791ab
commit 280771252c
5 changed files with 74 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
arch/arm/include/uapi/asm/kvm.h
View file

@ -204,6 +204,7 @@ struct kvm_arch_memory_slot {
#define KVM_DEV_ARM_VGIC_CTRL_INIT 0
#define KVM_DEV_ARM_ITS_SAVE_TABLES 1
#define KVM_DEV_ARM_ITS_RESTORE_TABLES 2
#define KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES 3
/* KVM_IRQ_LINE irq field index values */
#define KVM_ARM_IRQ_TYPE_SHIFT 24

1
arch/arm64/include/uapi/asm/kvm.h
View file

@ -224,6 +224,7 @@ struct kvm_arch_memory_slot {
#define KVM_DEV_ARM_VGIC_CTRL_INIT 0
#define KVM_DEV_ARM_ITS_SAVE_TABLES 1
#define KVM_DEV_ARM_ITS_RESTORE_TABLES 2
#define KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES 3
/* Device Control API on vcpu fd */
#define KVM_ARM_VCPU_PMU_V3_CTRL 0

20
virt/kvm/arm/vgic/vgic-kvm-device.c
View file

@ -580,6 +580,24 @@ static int vgic_v3_set_attr(struct kvm_device *dev,
reg = tmp32;
return vgic_v3_attr_regs_access(dev, attr, &reg, true);
}
case KVM_DEV_ARM_VGIC_GRP_CTRL: {
int ret;
switch (attr->attr) {
case KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES:
mutex_lock(&dev->kvm->lock);
if (!lock_all_vcpus(dev->kvm)) {
mutex_unlock(&dev->kvm->lock);
return -EBUSY;
}
ret = vgic_v3_save_pending_tables(dev->kvm);
unlock_all_vcpus(dev->kvm);
mutex_unlock(&dev->kvm->lock);
return ret;
}
break;
}
}
return -ENXIO;
}
@ -658,6 +676,8 @@ static int vgic_v3_has_attr(struct kvm_device *dev,
switch (attr->attr) {
case KVM_DEV_ARM_VGIC_CTRL_INIT:
return 0;
case KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES:
return 0;
}
}
return -ENXIO;

51
virt/kvm/arm/vgic/vgic-v3.c
View file

@ -278,6 +278,57 @@ int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq)
return 0;
}
/**
* vgic_its_save_pending_tables - Save the pending tables into guest RAM
* kvm lock and all vcpu lock must be held
*/
int vgic_v3_save_pending_tables(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
int last_byte_offset = -1;
struct vgic_irq *irq;
int ret;
list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
int byte_offset, bit_nr;
struct kvm_vcpu *vcpu;
gpa_t pendbase, ptr;
bool stored;
u8 val;
vcpu = irq->target_vcpu;
if (!vcpu)
continue;
pendbase = GICR_PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser);
byte_offset = irq->intid / BITS_PER_BYTE;
bit_nr = irq->intid % BITS_PER_BYTE;
ptr = pendbase + byte_offset;
if (byte_offset != last_byte_offset) {
ret = kvm_read_guest(kvm, ptr, &val, 1);
if (ret)
return ret;
last_byte_offset = byte_offset;
}
stored = val & (1U << bit_nr);
if (stored == irq->pending_latch)
continue;
if (irq->pending_latch)
val |= 1 << bit_nr;
else
val &= ~(1 << bit_nr);
ret = kvm_write_guest(kvm, ptr, &val, 1);
if (ret)
return ret;
}
return 0;
}
/* check for overlapping regions and for regions crossing the end of memory */
static bool vgic_v3_check_base(struct kvm *kvm)
{

1
virt/kvm/arm/vgic/vgic.h
View file

@ -173,6 +173,7 @@ void vgic_v3_enable(struct kvm_vcpu *vcpu);
int vgic_v3_probe(const struct gic_kvm_info *info);
int vgic_v3_map_resources(struct kvm *kvm);
int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq);
int vgic_v3_save_pending_tables(struct kvm *kvm);
int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t dist_base_address);
void vgic_v3_load(struct kvm_vcpu *vcpu);