[Qemu-devel] How to access guest memory from qemu device internal

[Kaiyuan]

Hello, all
 
I added a custom device to qemu. This device is attached to sysbus by mmio and 
has an address register in which device should access the guest memory the 
register point to.
I write a bare-metal program that pass an address like 0x1234ABCD to this 
address register. Inside qemu device code I added, if device reads value from 
register and directly accesses this value of 0x1234ABCD, it will access host 
memory 0x1234ABCD rather than guest  memory 0x1234ABCD.
Does qemu provide some functions that allow device to access guest memory 
address?

Thanks,
Kaiyuan Liang