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From: Elliot Berman <quic_eberman@quicinc.com>
Date: Thu, 22 Feb 2024 15:16:50 -0800
Subject: [PATCH v17 27/35] gunyah: rsc_mgr: Add RPC to enable demand paging
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References: <20240222-gunyah-v17-0-1e9da6763d38@quicinc.com>
In-Reply-To: <20240222-gunyah-v17-0-1e9da6763d38@quicinc.com>
To: Alex Elder <elder@linaro.org>,
        Srinivas Kandagatla
	<srinivas.kandagatla@linaro.org>,
        Murali Nalajal <quic_mnalajal@quicinc.com>,
        Trilok Soni <quic_tsoni@quicinc.com>,
        Srivatsa Vaddagiri
	<quic_svaddagi@quicinc.com>,
        Carl van Schaik <quic_cvanscha@quicinc.com>,
        Philip Derrin <quic_pderrin@quicinc.com>,
        Prakruthi Deepak Heragu
	<quic_pheragu@quicinc.com>,
        Jonathan Corbet <corbet@lwn.net>, Rob Herring
	<robh+dt@kernel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Bjorn Andersson
	<andersson@kernel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        "Fuad
 Tabba" <tabba@google.com>,
        Sean Christopherson <seanjc@google.com>,
        "Andrew
 Morton" <akpm@linux-foundation.org>
CC: <linux-arm-msm@vger.kernel.org>, <linux-doc@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <linux-mm@kvack.org>,
        Elliot Berman
	<quic_eberman@quicinc.com>

Add Gunyah Resource Manager RPC to enable demand paging for a virtual
machine. Resource manager needs to be informed of private memory regions
which will be demand paged and the location where the DTB memory parcel
should live in the guest's address space.

Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
---
 drivers/virt/gunyah/rsc_mgr.h     | 12 +++++++
 drivers/virt/gunyah/rsc_mgr_rpc.c | 73 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+)

diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h
index 68d08d3cff02d..99c2db18579ca 100644
--- a/drivers/virt/gunyah/rsc_mgr.h
+++ b/drivers/virt/gunyah/rsc_mgr.h
@@ -108,6 +108,18 @@ int gunyah_rm_get_hyp_resources(struct gunyah_rm *rm, u16 vmid,
 
 int gunyah_rm_get_vmid(struct gunyah_rm *rm, u16 *vmid);
 
+int gunyah_rm_vm_set_demand_paging(struct gunyah_rm *rm, u16 vmid, u32 count,
+				   struct gunyah_rm_mem_entry *mem_entries);
+
+enum gunyah_rm_range_id {
+	GUNYAH_RM_RANGE_ID_IMAGE = 0,
+	GUNYAH_RM_RANGE_ID_FIRMWARE = 1,
+};
+
+int gunyah_rm_vm_set_address_layout(struct gunyah_rm *rm, u16 vmid,
+				    enum gunyah_rm_range_id range_id,
+				    u64 base_address, u64 size);
+
 struct gunyah_resource *
 gunyah_rm_alloc_resource(struct gunyah_rm *rm,
 			 struct gunyah_rm_hyp_resource *hyp_resource);
diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c
index 99e5a3f1a5bb9..dfffcf02ddaea 100644
--- a/drivers/virt/gunyah/rsc_mgr_rpc.c
+++ b/drivers/virt/gunyah/rsc_mgr_rpc.c
@@ -24,6 +24,8 @@
 #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_DEMAND_PAGING	0x56000033
+#define GUNYAH_RM_RPC_VM_SET_ADDRESS_LAYOUT	0x56000034
 /* clang-format on */
 
 struct gunyah_rm_vm_common_vmid_req {
@@ -103,6 +105,23 @@ struct gunyah_rm_vm_config_image_req {
 	__le64 dtb_size;
 } __packed;
 
+/* Call: VM_SET_DEMAND_PAGING */
+struct gunyah_rm_vm_set_demand_paging_req {
+	__le16 vmid;
+	__le16 _padding;
+	__le32 range_count;
+	DECLARE_FLEX_ARRAY(struct gunyah_rm_mem_entry, ranges);
+} __packed;
+
+/* Call: VM_SET_ADDRESS_LAYOUT */
+struct gunyah_rm_vm_set_address_layout_req {
+	__le16 vmid;
+	__le16 _padding;
+	__le32 range_id;
+	__le64 range_base;
+	__le64 range_size;
+} __packed;
+
 /*
  * Several RM calls take only a VMID as a parameter and give only standard
  * response back. Deduplicate boilerplate code by using this common call.
@@ -494,3 +513,57 @@ int gunyah_rm_get_vmid(struct gunyah_rm *rm, u16 *vmid)
 	return ret;
 }
 EXPORT_SYMBOL_GPL(gunyah_rm_get_vmid);
+
+/**
+ * gunyah_rm_vm_set_demand_paging() - Enable demand paging of memory regions
+ * @rm: Handle to a Gunyah resource manager
+ * @vmid: VMID of the other VM
+ * @count: Number of demand paged memory regions
+ * @entries: Array of the regions
+ */
+int gunyah_rm_vm_set_demand_paging(struct gunyah_rm *rm, u16 vmid, u32 count,
+				   struct gunyah_rm_mem_entry *entries)
+{
+	struct gunyah_rm_vm_set_demand_paging_req *req __free(kfree) = NULL;
+	size_t req_size;
+
+	req_size = struct_size(req, ranges, count);
+	if (req_size == SIZE_MAX)
+		return -EINVAL;
+
+	req = kzalloc(req_size, GFP_KERNEL);
+	if (!req)
+		return -ENOMEM;
+
+	req->vmid = cpu_to_le16(vmid);
+	req->range_count = cpu_to_le32(count);
+	memcpy(req->ranges, entries, sizeof(*entries) * count);
+
+	return gunyah_rm_call(rm, GUNYAH_RM_RPC_VM_SET_DEMAND_PAGING, req,
+			      req_size, NULL, NULL);
+}
+ALLOW_ERROR_INJECTION(gunyah_rm_vm_set_demand_paging, ERRNO);
+
+/**
+ * gunyah_rm_vm_set_address_layout() - Set the start address of images
+ * @rm: Handle to a Gunyah resource manager
+ * @vmid: VMID of the other VM
+ * @range_id: Which image to set
+ * @base_address: Base address
+ * @size: Size
+ */
+int gunyah_rm_vm_set_address_layout(struct gunyah_rm *rm, u16 vmid,
+				    enum gunyah_rm_range_id range_id,
+				    u64 base_address, u64 size)
+{
+	struct gunyah_rm_vm_set_address_layout_req req = {
+		.vmid = cpu_to_le16(vmid),
+		.range_id = cpu_to_le32(range_id),
+		.range_base = cpu_to_le64(base_address),
+		.range_size = cpu_to_le64(size),
+	};
+
+	return gunyah_rm_call(rm, GUNYAH_RM_RPC_VM_SET_ADDRESS_LAYOUT, &req,
+			      sizeof(req), NULL, NULL);
+}
+ALLOW_ERROR_INJECTION(gunyah_rm_vm_set_address_layout, ERRNO);

-- 
2.34.1