hv: Prepare the gdt table for VM

For VMs of partition mode, there is no guarantee 1:1 mapping
between gpa and hpa, we need to copy the native gdt table to
each VM's memory.

Tracked-On: #1565
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>

Author: fyin1

hypervisor/common/vm_load.c

@@ -38,6 +38,25 @@ static uint32_t create_e820_table(struct e820_entry *param_e820)
 }
 #endif
 
+static void prepare_bsp_gdt(struct vm *vm)
+{
+	size_t gdt_len;
+	uint64_t gdt_base_hpa;
+	void *gdt_base_hva;
+
+	gdt_base_hpa = gpa2hpa(vm, vm0_boot_context.gdt.base);
+	if (vm0_boot_context.gdt.base == gdt_base_hpa) {
+		return;
+	} else {
+		gdt_base_hva = hpa2hva(gdt_base_hpa);
+		gdt_len = ((size_t)vm0_boot_context.gdt.limit + 1U)/sizeof(uint8_t);
+
+		(void )memcpy_s(gdt_base_hva, gdt_len, hpa2hva(vm0_boot_context.gdt.base), gdt_len);
+	}
+
+	return;
+}
+
 static uint64_t create_zero_page(struct vm *vm)
 {
 	struct zero_page *zeropage;
@@ -96,6 +115,7 @@ int general_sw_loader(struct vm *vm)
 
 	pr_dbg("Loading guest to run-time location");
 
+	prepare_bsp_gdt(vm);
 	set_vcpu_regs(vcpu, &vm0_boot_context);
 
 	/* calculate the kernel entry point */