[PATCH 08/17] KVM: arm64: Handle PKVM_HYP_REQ_HYP_ALLOC request

[Vincent Donnefort <vdonnefort@google.com>]

Introduce a new pkvm_hyp_request type asking the host to top up the pKVM
heap allocator.

Signed-off-by: Vincent Donnefort <vdonnefort@google.com>

diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm_pkvm.h
index fb4d140c99cc..bf43235e62d3 100644
--- a/arch/arm64/include/asm/kvm_pkvm.h
+++ b/arch/arm64/include/asm/kvm_pkvm.h
@@ -206,6 +206,7 @@ struct pkvm_mapping {
 
 enum pkvm_hyp_req_type {
 	PKVM_HYP_NO_REQ = 0,
+	PKVM_HYP_REQ_HYP_ALLOC,
 	__PKVM_HYP_REQ_TYPE_MAX,
 };
 
@@ -227,9 +228,13 @@ struct pkvm_hyp_req {
 
 static inline size_t pkvm_hyp_req_arg_size(u8 type)
 {
+	struct pkvm_hyp_req *req;
+
 	switch (type) {
 	case PKVM_HYP_NO_REQ:
 		return 0;
+	case PKVM_HYP_REQ_HYP_ALLOC:
+		return sizeof(req->mem);
 	default:
 		WARN_ON(1);
 	}
diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c
index ce96a6f90bd0..f5288a350069 100644
--- a/arch/arm64/kvm/pkvm.c
+++ b/arch/arm64/kvm/pkvm.c
@@ -116,6 +116,9 @@ static int pkvm_handle_hyp_req(struct pkvm_hyp_req *req)
 	int ret = -EINVAL;
 
 	switch (req->type) {
+	case PKVM_HYP_REQ_HYP_ALLOC:
+		ret = pkvm_hyp_topup(PKVM_TOPUP_HYP_ALLOC, req->mem.nr_pages);
+		break;
 	}
 
 	trace_kvm_handle_pkvm_hyp_req(req, ret);
-- 
2.54.0.631.ge1b05301d1-goog