linux-kernel - [PATCH v17 29/35] gunyah: rsc_mgr: Add RPC to set VM boot context

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Message-ID: <20240222-gunyah-v17-29-1e9da6763d38@quicinc.com>
Date: Thu, 22 Feb 2024 15:16:52 -0800
From: Elliot Berman <quic_eberman@...cinc.com>
To: Alex Elder <elder@...aro.org>,
        Srinivas Kandagatla
	<srinivas.kandagatla@...aro.org>,
        Murali Nalajal <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Srivatsa Vaddagiri
	<quic_svaddagi@...cinc.com>,
        Carl van Schaik <quic_cvanscha@...cinc.com>,
        Philip Derrin <quic_pderrin@...cinc.com>,
        Prakruthi Deepak Heragu
	<quic_pheragu@...cinc.com>,
        Jonathan Corbet <corbet@....net>, Rob Herring
	<robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Fuad
 Tabba" <tabba@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        "Andrew
 Morton" <akpm@...ux-foundation.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-mm@...ck.org>,
        Elliot Berman
	<quic_eberman@...cinc.com>
Subject: [PATCH v17 29/35] gunyah: rsc_mgr: Add RPC to set VM boot context

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

Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
---
 drivers/virt/gunyah/rsc_mgr.h     |  2 ++
 drivers/virt/gunyah/rsc_mgr_rpc.c | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h
index 99c2db18579ca..2acaf8dff365e 100644
--- a/drivers/virt/gunyah/rsc_mgr.h
+++ b/drivers/virt/gunyah/rsc_mgr.h
@@ -84,6 +84,8 @@ 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;
diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c
index dfffcf02ddaea..eabf8659eb8f9 100644
--- a/drivers/virt/gunyah/rsc_mgr_rpc.c
+++ b/drivers/virt/gunyah/rsc_mgr_rpc.c
@@ -24,6 +24,7 @@
 #define GUNYAH_RM_RPC_VM_INIT			0x5600000B
 #define GUNYAH_RM_RPC_VM_GET_HYP_RESOURCES	0x56000020
 #define GUNYAH_RM_RPC_VM_GET_VMID		0x56000024
+#define GUNYAH_RM_RPC_VM_SET_BOOT_CONTEXT	0x56000031
 #define GUNYAH_RM_RPC_VM_SET_DEMAND_PAGING	0x56000033
 #define GUNYAH_RM_RPC_VM_SET_ADDRESS_LAYOUT	0x56000034
 /* clang-format on */
@@ -105,6 +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 +457,29 @@ 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

-- 
2.34.1