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KVM: arm64: vgic-its: ITT save and restore

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Implement routines to save and restore device ITT and their
interrupt table entries (ITE).

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
This commit is contained in:
Eric Auger 2017-05-03 17:38:01 +02:00 committed by Christoffer Dall
parent 57a9a11715
commit eff484e029
2 changed files with 117 additions and 3 deletions
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116
virt/kvm/arm/vgic/vgic-its.c
View File

@ -1750,7 +1750,7 @@ static u32 compute_next_devid_offset(struct list_head *h,
return min_t(u32, next_offset, VITS_DTE_MAX_DEVID_OFFSET);
}
u32 compute_next_eventid_offset(struct list_head *h, struct its_ite *ite)
static u32 compute_next_eventid_offset(struct list_head *h, struct its_ite *ite)
{
struct its_ite *next;
u32 next_offset;
@ -1827,14 +1827,124 @@ out:
return ret;
}
/**
* vgic_its_save_ite - Save an interrupt translation entry at @gpa
*/
static int vgic_its_save_ite(struct vgic_its *its, struct its_device *dev,
struct its_ite *ite, gpa_t gpa, int ite_esz)
{
struct kvm *kvm = its->dev->kvm;
u32 next_offset;
u64 val;
next_offset = compute_next_eventid_offset(&dev->itt_head, ite);
val = ((u64)next_offset << KVM_ITS_ITE_NEXT_SHIFT) |
((u64)ite->lpi << KVM_ITS_ITE_PINTID_SHIFT) |
ite->collection->collection_id;
val = cpu_to_le64(val);
return kvm_write_guest(kvm, gpa, &val, ite_esz);
}
/**
* vgic_its_restore_ite - restore an interrupt translation entry
* @event_id: id used for indexing
* @ptr: pointer to the ITE entry
* @opaque: pointer to the its_device
*/
static int vgic_its_restore_ite(struct vgic_its *its, u32 event_id,
void *ptr, void *opaque)
{
struct its_device *dev = (struct its_device *)opaque;
struct its_collection *collection;
struct kvm *kvm = its->dev->kvm;
struct kvm_vcpu *vcpu = NULL;
u64 val;
u64 *p = (u64 *)ptr;
struct vgic_irq *irq;
u32 coll_id, lpi_id;
struct its_ite *ite;
u32 offset;
val = *p;
val = le64_to_cpu(val);
coll_id = val & KVM_ITS_ITE_ICID_MASK;
lpi_id = (val & KVM_ITS_ITE_PINTID_MASK) >> KVM_ITS_ITE_PINTID_SHIFT;
if (!lpi_id)
return 1; /* invalid entry, no choice but to scan next entry */
if (lpi_id < VGIC_MIN_LPI)
return -EINVAL;
offset = val >> KVM_ITS_ITE_NEXT_SHIFT;
if (event_id + offset >= BIT_ULL(dev->num_eventid_bits))
return -EINVAL;
collection = find_collection(its, coll_id);
if (!collection)
return -EINVAL;
ite = vgic_its_alloc_ite(dev, collection, lpi_id, event_id);
if (IS_ERR(ite))
return PTR_ERR(ite);
if (its_is_collection_mapped(collection))
vcpu = kvm_get_vcpu(kvm, collection->target_addr);
irq = vgic_add_lpi(kvm, lpi_id, vcpu);
if (IS_ERR(irq))
return PTR_ERR(irq);
ite->irq = irq;
return offset;
}
static int vgic_its_ite_cmp(void *priv, struct list_head *a,
struct list_head *b)
{
struct its_ite *itea = container_of(a, struct its_ite, ite_list);
struct its_ite *iteb = container_of(b, struct its_ite, ite_list);
if (itea->event_id < iteb->event_id)
return -1;
else
return 1;
}
static int vgic_its_save_itt(struct vgic_its *its, struct its_device *device)
{
return -ENXIO;
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
gpa_t base = device->itt_addr;
struct its_ite *ite;
int ret;
int ite_esz = abi->ite_esz;
list_sort(NULL, &device->itt_head, vgic_its_ite_cmp);
list_for_each_entry(ite, &device->itt_head, ite_list) {
gpa_t gpa = base + ite->event_id * ite_esz;
ret = vgic_its_save_ite(its, device, ite, gpa, ite_esz);
if (ret)
return ret;
}
return 0;
}
static int vgic_its_restore_itt(struct vgic_its *its, struct its_device *dev)
{
return -ENXIO;
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
gpa_t base = dev->itt_addr;
int ret;
int ite_esz = abi->ite_esz;
size_t max_size = BIT_ULL(dev->num_eventid_bits) * ite_esz;
ret = scan_its_table(its, base, max_size, ite_esz, 0,
vgic_its_restore_ite, dev);
return ret;
}
/**

4
virt/kvm/arm/vgic/vgic.h
View File

@ -81,6 +81,10 @@
#define KVM_ITS_CTE_VALID_MASK BIT_ULL(63)
#define KVM_ITS_CTE_RDBASE_SHIFT 16
#define KVM_ITS_CTE_ICID_MASK GENMASK_ULL(15, 0)
#define KVM_ITS_ITE_NEXT_SHIFT 48
#define KVM_ITS_ITE_PINTID_SHIFT 16
#define KVM_ITS_ITE_PINTID_MASK GENMASK_ULL(47, 16)
#define KVM_ITS_ITE_ICID_MASK GENMASK_ULL(15, 0)
#define KVM_ITS_DTE_VALID_SHIFT 63
#define KVM_ITS_DTE_VALID_MASK BIT_ULL(63)
#define KVM_ITS_DTE_NEXT_SHIFT 49