[PATCH v2 09/13] KVM: arm64: Trap & emulate the ITS MAPC command

[Sebastian Ene <sebastianene@google.com>]

Parse the MAPC command and verify if we need to do any updates to the
shadow collection table.

Signed-off-by: Sebastian Ene <sebastianene@google.com>
---
 arch/arm64/kvm/hyp/nvhe/its_emulate.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm64/kvm/hyp/nvhe/its_emulate.c b/arch/arm64/kvm/hyp/nvhe/its_emulate.c
index 071a08d3602d..5629e2a070df 100644
--- a/arch/arm64/kvm/hyp/nvhe/its_emulate.c
+++ b/arch/arm64/kvm/hyp/nvhe/its_emulate.c
@@ -332,6 +332,13 @@ static int process_its_mapd(struct its_priv_state *its, struct its_cmd_block *cm
 	return track_pfn(its, device_id, itt_pfn, num_pages, remove);
 }
 
+static int process_its_mapc(struct its_priv_state *its, struct its_cmd_block *cmd, bool rollback)
+{
+	u32 icid = cmd->raw_cmd[2] & GENMASK(15, 0);
+
+	return check_table_update(its, icid, GITS_BASER_TYPE_COLLECTION, rollback);
+}
+
 static int process_cmd(struct its_priv_state *its, struct its_cmd_block *cmd,
 		       bool rollback)
 {
@@ -342,6 +349,10 @@ static int process_cmd(struct its_priv_state *its, struct its_cmd_block *cmd,
 	case GITS_CMD_MAPD:
 		ret = process_its_mapd(its, cmd, rollback);
 		break;
+
+	case GITS_CMD_MAPC:
+		ret = process_its_mapc(its, cmd, rollback);
+		break;
 	default:
 		/* Passthrough everything for now */
 		break;
-- 
2.55.0.654.g21b8a5bc05-goog