linux-kernel - [RFC PATCH 30/34] gunyah: Add RPC to set VM boot context

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Message-Id: <20250424141341.841734-31-karim.manaouil@linaro.org>
Date: Thu, 24 Apr 2025 15:13:37 +0100
From: Karim Manaouil <karim.manaouil@...aro.org>
To: linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev
Cc: Karim Manaouil <karim.manaouil@...aro.org>,
	Alexander Graf <graf@...zon.com>,
	Alex Elder <elder@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Fuad Tabba <tabba@...gle.com>,
	Joey Gouly <joey.gouly@....com>,
	Jonathan Corbet <corbet@....net>,
	Marc Zyngier <maz@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
	Quentin Perret <qperret@...gle.com>,
	Rob Herring <robh@...nel.org>,
	Srinivas Kandagatla <srini@...nel.org>,
	Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>,
	Will Deacon <will@...nel.org>,
	Haripranesh S <haripran@....qualcomm.com>,
	Carl van Schaik <cvanscha@....qualcomm.com>,
	Murali Nalajala <mnalajal@...cinc.com>,
	Sreenivasulu Chalamcharla <sreeniva@....qualcomm.com>,
	Trilok Soni <tsoni@...cinc.com>,
	Stefan Schmidt <stefan.schmidt@...aro.org>,
	Elliot Berman <quic_eberman@...cinc.com>
Subject: [RFC PATCH 30/34] gunyah: Add RPC to set VM boot context

From: Elliot Berman <quic_eberman@...cinc.com>

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

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;
-- 
2.39.5