diff mbox series

[RFC,30/34] gunyah: Add RPC to set VM boot context

Message ID 20250424141341.841734-31-karim.manaouil@linaro.org
State New
Headers show
Series Running Qualcomm's Gunyah Guests via KVM in EL1 | expand

Commit Message

Karim Manaouil April 24, 2025, 2:13 p.m. UTC 
From: Elliot Berman <quic_eberman@quicinc.com>

The initial context of a the primary vCPU can be initialized by
performing RM RPC calls.

Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
Reviewed-by: Srivatsa Vaddagiri <quic_svaddagi@quicinc.com>
Signed-off-by: Karim Manaouil <karim.manaouil@linaro.org>
---
 drivers/virt/gunyah/rsc_mgr_rpc.c | 32 +++++++++++++++++++++++++++++++
 include/linux/gunyah_rsc_mgr.h    |  2 ++
 2 files changed, 34 insertions(+)
diff mbox series

Patch

diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c
index 7fccd871cc0b..78c4d1d5d42a 100644
--- a/drivers/virt/gunyah/rsc_mgr_rpc.c
+++ b/drivers/virt/gunyah/rsc_mgr_rpc.c
@@ -106,6 +106,15 @@  struct gunyah_rm_vm_config_image_req {
 	__le64 dtb_size;
 } __packed;
 
+/* Call: VM_SET_BOOT_CONTEXT */
+struct gunyah_rm_vm_set_boot_context_req {
+	__le16 vmid;
+	u8 reg_set;
+	u8 reg_index;
+	__le32 _padding;
+	__le64 value;
+} __packed;
+
 /* Call: VM_SET_DEMAND_PAGING */
 struct gunyah_rm_vm_set_demand_paging_req {
 	__le16 vmid;
@@ -447,6 +456,29 @@  int gunyah_rm_vm_init(struct gunyah_rm *rm, u16 vmid)
 }
 ALLOW_ERROR_INJECTION(gunyah_rm_vm_init, ERRNO);
 
+/**
+ * gunyah_rm_vm_set_boot_context() - set the initial boot context of the primary vCPU
+ * @rm: Handle to a Gunyah resource manager
+ * @vmid: VM identifier
+ * @reg_set: See &enum gunyah_vm_boot_context_reg
+ * @reg_index: Which register to set; must be 0 for REG_SET_PC
+ * @value: Value to set in the register
+ */
+int gunyah_rm_vm_set_boot_context(struct gunyah_rm *rm, u16 vmid, u8 reg_set,
+				  u8 reg_index, u64 value)
+{
+	struct gunyah_rm_vm_set_boot_context_req req_payload = {
+		.vmid = cpu_to_le16(vmid),
+		.reg_set = reg_set,
+		.reg_index = reg_index,
+		.value = cpu_to_le64(value),
+	};
+
+	return gunyah_rm_call(rm, GUNYAH_RM_RPC_VM_SET_BOOT_CONTEXT,
+			      &req_payload, sizeof(req_payload), NULL, NULL);
+}
+ALLOW_ERROR_INJECTION(gunyah_rm_vm_set_boot_context, ERRNO);
+
 /**
  * gunyah_rm_get_hyp_resources() - Retrieve hypervisor resources (capabilities) associated with a VM
  * @rm: Handle to a Gunyah resource manager
diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h
index f16e64af9273..6a07fe25b0ba 100644
--- a/include/linux/gunyah_rsc_mgr.h
+++ b/include/linux/gunyah_rsc_mgr.h
@@ -126,6 +126,8 @@  int gunyah_rm_vm_configure(struct gunyah_rm *rm, u16 vmid,
 			   u32 mem_handle, u64 image_offset, u64 image_size,
 			   u64 dtb_offset, u64 dtb_size);
 int gunyah_rm_vm_init(struct gunyah_rm *rm, u16 vmid);
+int gunyah_rm_vm_set_boot_context(struct gunyah_rm *rm, u16 vmid, u8 reg_set,
+				  u8 reg_index, u64 value);
 
 struct gunyah_rm_hyp_resource {
 	u8 type;