[PATCH v4 19/22] KVM: arm64: ITS: vgic_its_check_id returns the entry's GPA

Eric Auger
2017-03-27T09:31:02Z

As vgic_its_check_id() computes the device/collection entry's
GPA, let's return it so that new callers can retrieve it easily.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

---
v3 -> v4:
- check eaddr is not NULL to allow passing NULL eaddr parameter
to vgic_its_check_id

v2: new
---
virt/kvm/arm/vgic/vgic-its.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index df984b6..b907e3c 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -629,7 +629,8 @@ static int vgic_its_cmd_handle_movi(struct kvm *kvm, struct vgic_its *its,
* is actually valid (covered by a memslot and guest accessible).
* For this we have to read the respective first level entry.
*/
-static bool vgic_its_check_id(struct vgic_its *its, u64 baser, u32 id)
+static bool vgic_its_check_id(struct vgic_its *its, u64 baser, u32 id,
+ gpa_t *eaddr)
{
int l1_tbl_size = GITS_BASER_NR_PAGES(baser) * SZ_64K;
int index;
@@ -649,6 +650,8 @@ static bool vgic_its_check_id(struct vgic_its *its, u64 baser, u32 id)
addr = BASER_ADDRESS(baser) + id * esz;
gfn = addr >> PAGE_SHIFT;

+ if (eaddr)
+ *eaddr = addr;
return kvm_is_visible_gfn(its->dev->kvm, gfn);
}

@@ -681,6 +684,8 @@ static bool vgic_its_check_id(struct vgic_its *its, u64 baser, u32 id)
indirect_ptr += index * esz;
gfn = indirect_ptr >> PAGE_SHIFT;

+ if (eaddr)
+ *eaddr = indirect_ptr;
return kvm_is_visible_gfn(its->dev->kvm, gfn);
}

@@ -690,7 +695,7 @@ static int vgic_its_alloc_collection(struct vgic_its *its,
{
struct its_collection *collection;

- if (!vgic_its_check_id(its, its->baser_coll_table, coll_id))
+ if (!vgic_its_check_id(its, its->baser_coll_table, coll_id, NULL))
return E_ITS_MAPC_COLLECTION_OOR;

collection = kzalloc(sizeof(*collection), GFP_KERNEL);
@@ -905,7 +910,7 @@ static int vgic_its_cmd_handle_mapd(struct kvm *kvm, struct vgic_its *its,
gpa_t itt_addr = its_cmd_get_ittaddr(its_cmd) << 8;
struct its_device *device;

- if (!vgic_its_check_id(its, its->baser_device_table, device_id))
+ if (!vgic_its_check_id(its, its->baser_device_table, device_id, NULL))
return E_ITS_MAPD_DEVICE_OOR;

if (valid && nb_eventid_bits > VITS_TYPER_IDBITS)
--
2.5.5