[PATCH v7 12/24] KVM: arm64: vgic-its: Interpret MAPD ITT_addr field

[Eric Auger]

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 at redhat.com>
Reviewed-by: Christoffer Dall <cdall at linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier at arm.com>

---
v6 -> v7:
- added Christoffer's and Marc's R-b

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 031f6ab..7b95b73 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -104,6 +104,7 @@ 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;
 };
 
@@ -602,6 +603,7 @@ 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)
 
@@ -873,6 +875,7 @@ 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))
@@ -904,6 +907,7 @@ 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