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From: Liju-clr Chen <liju-clr.chen@mediatek.com>
To: Rob Herring <robh@kernel.org>, Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
	"Catalin Marinas" <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>,
	"Steven Rostedt" <rostedt@goodmis.org>, Masami Hiramatsu
	<mhiramat@kernel.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Richard Cochran <richardcochran@gmail.com>, Matthias Brugger
	<matthias.bgg@gmail.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@collabora.com>, Liju-clr Chen
	<Liju-clr.Chen@mediatek.com>, Yingshiuan Pan <Yingshiuan.Pan@mediatek.com>,
	Ze-yu Wang <Ze-yu.Wang@mediatek.com>
CC: <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-doc@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>,
	<linux-trace-kernel@vger.kernel.org>, <netdev@vger.kernel.org>,
	<linux-mediatek@lists.infradead.org>, David Bradil <dbrazdil@google.com>,
	Trilok Soni <quic_tsoni@quicinc.com>, Shawn Hsiao <shawn.hsiao@mediatek.com>,
	PeiLun Suei <PeiLun.Suei@mediatek.com>, Chi-shen Yeh
	<Chi-shen.Yeh@mediatek.com>, Kevenny Hsieh <Kevenny.Hsieh@mediatek.com>,
	Liju-clr Chen <liju-clr.chen@mediatek.com>
Subject: [PATCH v11 13/21] virt: geniezone: Add dtb config support
Date: Wed, 29 May 2024 16:42:31 +0800
Message-ID: <20240529084239.11478-14-liju-clr.chen@mediatek.com>
In-Reply-To: <20240529084239.11478-1-liju-clr.chen@mediatek.com>
References: <20240529084239.11478-1-liju-clr.chen@mediatek.com>
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From: Yi-De Wu <yi-de.wu@mediatek.com>

From: "Jerry Wang" <ze-yu.wang@mediatek.com>

Hypervisor might need to know the accurate address and size of dtb
passed from userspace. And then hypervisor would parse the dtb and get
vm information.

Signed-off-by: Jerry Wang <ze-yu.wang@mediatek.com>
Signed-off-by: Liju-clr Chen <liju-clr.chen@mediatek.com>
Signed-off-by: Yi-De Wu <yi-de.wu@mediatek.com>
---
 arch/arm64/geniezone/gzvm_arch_common.h |  2 ++
 arch/arm64/geniezone/vm.c               |  9 +++++++++
 drivers/virt/geniezone/gzvm_vm.c        | 10 ++++++++++
 include/linux/soc/mediatek/gzvm_drv.h   |  1 +
 include/uapi/linux/gzvm.h               | 14 ++++++++++++++
 5 files changed, 36 insertions(+)

diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h
index dabd11438e94..4366618cdc0a 100644
--- a/arch/arm64/geniezone/gzvm_arch_common.h
+++ b/arch/arm64/geniezone/gzvm_arch_common.h
@@ -23,6 +23,7 @@ enum {
 	GZVM_FUNC_ENABLE_CAP = 13,
 	GZVM_FUNC_INFORM_EXIT = 14,
 	GZVM_FUNC_MEMREGION_PURPOSE = 15,
+	GZVM_FUNC_SET_DTB_CONFIG = 16,
 	NR_GZVM_FUNC,
 };
 
@@ -46,6 +47,7 @@ enum {
 #define MT_HVC_GZVM_ENABLE_CAP		GZVM_HCALL_ID(GZVM_FUNC_ENABLE_CAP)
 #define MT_HVC_GZVM_INFORM_EXIT		GZVM_HCALL_ID(GZVM_FUNC_INFORM_EXIT)
 #define MT_HVC_GZVM_MEMREGION_PURPOSE	GZVM_HCALL_ID(GZVM_FUNC_MEMREGION_PURPOSE)
+#define MT_HVC_GZVM_SET_DTB_CONFIG	GZVM_HCALL_ID(GZVM_FUNC_SET_DTB_CONFIG)
 
 #define GIC_V3_NR_LRS			16
 
diff --git a/arch/arm64/geniezone/vm.c b/arch/arm64/geniezone/vm.c
index c20a2ded2a4f..00c74a4bcfd7 100644
--- a/arch/arm64/geniezone/vm.c
+++ b/arch/arm64/geniezone/vm.c
@@ -154,6 +154,15 @@ int gzvm_arch_memregion_purpose(struct gzvm *gzvm,
 				    mem->flags, 0, 0, 0, &res);
 }
 
+int gzvm_arch_set_dtb_config(struct gzvm *gzvm, struct gzvm_dtb_config *cfg)
+{
+	struct arm_smccc_res res;
+
+	return gzvm_hypcall_wrapper(MT_HVC_GZVM_SET_DTB_CONFIG, gzvm->vm_id,
+				    cfg->dtb_addr, cfg->dtb_size, 0, 0, 0, 0,
+				    &res);
+}
+
 static int gzvm_vm_arch_enable_cap(struct gzvm *gzvm,
 				   struct gzvm_enable_cap *cap,
 				   struct arm_smccc_res *res)
diff --git a/drivers/virt/geniezone/gzvm_vm.c b/drivers/virt/geniezone/gzvm_vm.c
index 91f08dd72c63..30d8aec98bea 100644
--- a/drivers/virt/geniezone/gzvm_vm.c
+++ b/drivers/virt/geniezone/gzvm_vm.c
@@ -281,6 +281,16 @@ static long gzvm_vm_ioctl(struct file *filp, unsigned int ioctl,
 		ret = gzvm_vm_ioctl_enable_cap(gzvm, &cap, argp);
 		break;
 	}
+	case GZVM_SET_DTB_CONFIG: {
+		struct gzvm_dtb_config cfg;
+
+		if (copy_from_user(&cfg, argp, sizeof(cfg))) {
+			ret = -EFAULT;
+			goto out;
+		}
+		ret = gzvm_arch_set_dtb_config(gzvm, &cfg);
+		break;
+	}
 	default:
 		ret = -ENOTTY;
 	}
diff --git a/include/linux/soc/mediatek/gzvm_drv.h b/include/linux/soc/mediatek/gzvm_drv.h
index 3c2b5d9071c6..982463eea4f6 100644
--- a/include/linux/soc/mediatek/gzvm_drv.h
+++ b/include/linux/soc/mediatek/gzvm_drv.h
@@ -181,6 +181,7 @@ void gzvm_vm_irqfd_release(struct gzvm *gzvm);
 
 int gzvm_arch_memregion_purpose(struct gzvm *gzvm,
 				struct gzvm_userspace_memory_region *mem);
+int gzvm_arch_set_dtb_config(struct gzvm *gzvm, struct gzvm_dtb_config *args);
 
 int gzvm_init_ioeventfd(struct gzvm *gzvm);
 int gzvm_ioeventfd(struct gzvm *gzvm, struct gzvm_ioeventfd *args);
diff --git a/include/uapi/linux/gzvm.h b/include/uapi/linux/gzvm.h
index 6e102cbfec98..7aec4adf2206 100644
--- a/include/uapi/linux/gzvm.h
+++ b/include/uapi/linux/gzvm.h
@@ -364,4 +364,18 @@ struct gzvm_ioeventfd {
 
 #define GZVM_IOEVENTFD	_IOW(GZVM_IOC_MAGIC, 0x79, struct gzvm_ioeventfd)
 
+/**
+ * struct gzvm_dtb_config: store address and size of dtb passed from userspace
+ *
+ * @dtb_addr: dtb address set by VMM (guset memory)
+ * @dtb_size: dtb size
+ */
+struct gzvm_dtb_config {
+	__u64 dtb_addr;
+	__u64 dtb_size;
+};
+
+#define GZVM_SET_DTB_CONFIG       _IOW(GZVM_IOC_MAGIC, 0xff, \
+				       struct gzvm_dtb_config)
+
 #endif /* __GZVM_H__ */
-- 
2.18.0