Re: [PATCH v4 8/9] virt: geniezone: Add dtb config support

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Il 09/06/23 10:52, Yi-De Wu ha scritto:
From: "Jerry Wang" <ze-yu.wang@xxxxxxxxxxxx>

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@xxxxxxxxxxxx>
Signed-off-by: Liju-clr Chen <liju-clr.chen@xxxxxxxxxxxx>
Signed-off-by: Yi-De Wu <yi-de.wu@xxxxxxxxxxxx>
---
  arch/arm64/geniezone/gzvm_arch_common.h |  2 ++
  arch/arm64/geniezone/vm.c               |  8 ++++++++
  drivers/virt/geniezone/gzvm_vm.c        |  8 ++++++++
  include/linux/gzvm_drv.h                |  1 +
  include/uapi/linux/gzvm.h               | 10 ++++++++++
  5 files changed, 29 insertions(+)

diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h
index 5cfeb4df84c5..ccd2a7516eeb 100644
--- a/arch/arm64/geniezone/gzvm_arch_common.h
+++ b/arch/arm64/geniezone/gzvm_arch_common.h
@@ -24,6 +24,7 @@ enum {
  	GZVM_FUNC_PROBE,
  	GZVM_FUNC_ENABLE_CAP,
  	GZVM_FUNC_MEMREGION_PURPOSE,
+	GZVM_FUNC_SET_DTB_CONFIG,
  	NR_GZVM_FUNC
  };
@@ -48,6 +49,7 @@ enum {
  #define MT_HVC_GZVM_PROBE		GZVM_HCALL_ID(GZVM_FUNC_PROBE)
  #define MT_HVC_GZVM_ENABLE_CAP		GZVM_HCALL_ID(GZVM_FUNC_ENABLE_CAP)
  #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 e19a66d6a75d..6062fe85c70e 100644
--- a/arch/arm64/geniezone/vm.c
+++ b/arch/arm64/geniezone/vm.c
@@ -106,6 +106,14 @@ int gzvm_arch_memregion_purpose(struct gzvm *gzvm, struct gzvm_userspace_memory_
  				    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 3b1cb715ef34..d379793deace 100644
--- a/drivers/virt/geniezone/gzvm_vm.c
+++ b/drivers/virt/geniezone/gzvm_vm.c
@@ -390,6 +390,14 @@ 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)))
+			goto out;
+		ret = gzvm_arch_set_dtb_config(gzvm, &cfg);
+		break;
+	}
  	default:
  		ret = -ENOTTY;
  	}
diff --git a/include/linux/gzvm_drv.h b/include/linux/gzvm_drv.h
index 288a339bf382..e920397e83d3 100644
--- a/include/linux/gzvm_drv.h
+++ b/include/linux/gzvm_drv.h
@@ -146,6 +146,7 @@ void gzvm_sync_hwstate(struct gzvm_vcpu *vcpu);
  extern struct miscdevice *gzvm_debug_dev;
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 2af1b068947c..28354c17ed9c 100644
--- a/include/uapi/linux/gzvm.h
+++ b/include/uapi/linux/gzvm.h
@@ -265,4 +265,14 @@ struct gzvm_ioeventfd {
#define GZVM_IOEVENTFD _IOW(GZVM_IOC_MAGIC, 0x79, struct gzvm_ioeventfd) +struct gzvm_dtb_config {

kerneldoc please.

+	/* dtb address set by VMM (guset memory) */
+	__u64 dtb_addr;
+	/* dtb size */
+	__u64 dtb_size;
+};
+
+#define GZVM_SET_DTB_CONFIG       _IOW(GZVM_IOC_MAGIC, 0xff, \
+				       struct gzvm_dtb_config)
+
  #endif /* __GZVM_H__ */




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