[PATCH v6 12/24] KVM: arm64: vgic-its: Interpret MAPD ITT_addr field

Eric Auger
2017-05-04T11:46:07Z

Up to now the MAPD ITT_addr had been ignored. We will need it
for save/restore. Let's record it in the its_device struct.

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

---
v5 -> v6:
- fix its_cmd_get_ittaddr and pass 44 to its_cmd_mask_field

v4 -> v5:
- its_cmd_get_ittaddr macro now returns the actual ITT GPA

v3 -> v4:
- in vgic_its_cmd_handle_mapd, itt_addr directly is shifted
- correct ittaddr bitmask to support 48bit GPA
---
virt/kvm/arm/vgic/vgic-its.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 06e01d1..6da548d 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -106,6 +106,7 @@ struct its_device {
/* the head for the list of ITTEs */
struct list_head itt_head;
u32 num_eventid_bits;
+ gpa_t itt_addr;
u32 device_id;
};

@@ -576,6 +577,7 @@ static u64 its_cmd_mask_field(u64 *its_cmd, int word, int shift, int size)
#define its_cmd_get_id(cmd) its_cmd_mask_field(cmd, 1, 0, 32)
#define its_cmd_get_physical_id(cmd) its_cmd_mask_field(cmd, 1, 32, 32)
#define its_cmd_get_collection(cmd) its_cmd_mask_field(cmd, 2, 0, 16)
+#define its_cmd_get_ittaddr(cmd) (its_cmd_mask_field(cmd, 2, 8, 44) << 8)
#define its_cmd_get_target_addr(cmd) its_cmd_mask_field(cmd, 2, 16, 32)
#define its_cmd_get_validbit(cmd) its_cmd_mask_field(cmd, 2, 63, 1)

@@ -847,6 +849,7 @@ static int vgic_its_cmd_handle_mapd(struct kvm *kvm, struct vgic_its *its,
u32 device_id = its_cmd_get_deviceid(its_cmd);
bool valid = its_cmd_get_validbit(its_cmd);
u8 num_eventid_bits = its_cmd_get_size(its_cmd);
+ gpa_t itt_addr = its_cmd_get_ittaddr(its_cmd);
struct its_device *device;

if (!vgic_its_check_id(its, its->baser_device_table, device_id))
@@ -878,6 +881,7 @@ static int vgic_its_cmd_handle_mapd(struct kvm *kvm, struct vgic_its *its,

device->device_id = device_id;
device->num_eventid_bits = num_eventid_bits;
+ device->itt_addr = itt_addr;

INIT_LIST_HEAD(&device->itt_head);

--
2.5.5