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Re: [Qemu-devel] How to access guest memory from qemu device internal
From: |
Greg Kurz |
Subject: |
Re: [Qemu-devel] How to access guest memory from qemu device internal |
Date: |
Thu, 20 Nov 2014 17:08:59 +0100 |
On Thu, 20 Nov 2014 21:25:18 +0800 (GMT+08:00)
Kaiyuan <address@hidden> wrote:
> 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?
>
Have a look at *_phys* functions in the <exec/cpu-common.h> QEMU header file
(cpu_physical_memory_read() for
exemple).
> Thanks,
> Kaiyuan Liang
>
--
G