[PATCH v4 7/9] virt: geniezone: Add memory region support

[Yi-De Wu]

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

Hypervisor might need to know the precise purpose of each memory
region, so that it can provide specific memory protection. We add a new
uapi to pass address and size of a memory region and its purpose.

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               | 9 +++++++++
 drivers/virt/geniezone/gzvm_vm.c        | 1 +
 include/linux/gzvm_drv.h                | 2 ++
 4 files changed, 14 insertions(+)

diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h
index 5affa28b935a..5cfeb4df84c5 100644
--- a/arch/arm64/geniezone/gzvm_arch_common.h
+++ b/arch/arm64/geniezone/gzvm_arch_common.h
@@ -23,6 +23,7 @@ enum {
 	GZVM_FUNC_CREATE_DEVICE,
 	GZVM_FUNC_PROBE,
 	GZVM_FUNC_ENABLE_CAP,
+	GZVM_FUNC_MEMREGION_PURPOSE,
 	NR_GZVM_FUNC
 };
 
@@ -46,6 +47,7 @@ enum {
 #define MT_HVC_GZVM_CREATE_DEVICE	GZVM_HCALL_ID(GZVM_FUNC_CREATE_DEVICE)
 #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 GIC_V3_NR_LRS			16
 
 /**
diff --git a/arch/arm64/geniezone/vm.c b/arch/arm64/geniezone/vm.c
index 9f1f14f71b99..e19a66d6a75d 100644
--- a/arch/arm64/geniezone/vm.c
+++ b/arch/arm64/geniezone/vm.c
@@ -97,6 +97,15 @@ int gzvm_arch_destroy_vm(gzvm_id_t vm_id)
 				    0, 0, &res);
 }
 
+int gzvm_arch_memregion_purpose(struct gzvm *gzvm, struct gzvm_userspace_memory_region *mem)
+{
+	struct arm_smccc_res res;
+
+	return gzvm_hypcall_wrapper(MT_HVC_GZVM_MEMREGION_PURPOSE, gzvm->vm_id,
+				    mem->guest_phys_addr, mem->memory_size,
+				    mem->flags, 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 ba5412acfa7d..3b1cb715ef34 100644
--- a/drivers/virt/geniezone/gzvm_vm.c
+++ b/drivers/virt/geniezone/gzvm_vm.c
@@ -248,6 +248,7 @@ gzvm_vm_ioctl_set_memory_region(struct gzvm *gzvm,
 	memslot->vma = vma;
 	memslot->flags = mem->flags;
 	memslot->slot_id = mem->slot;
+	gzvm_arch_memregion_purpose(gzvm, mem);
 	return register_memslot_addr_range(gzvm, memslot);
 }
 
diff --git a/include/linux/gzvm_drv.h b/include/linux/gzvm_drv.h
index f0a172fb0dd8..288a339bf382 100644
--- a/include/linux/gzvm_drv.h
+++ b/include/linux/gzvm_drv.h
@@ -145,6 +145,8 @@ 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_init_ioeventfd(struct gzvm *gzvm);
 int gzvm_ioeventfd(struct gzvm *gzvm, struct gzvm_ioeventfd *args);
 bool gzvm_ioevent_write(struct gzvm_vcpu *vcpu, __u64 addr, int len,
-- 
2.18.0