From: "陳韋任 (Wei-Ren Chen)" <chenwj@iis.sinica.edu.tw>
To: Max Filippov <jcmvbkbc@gmail.com>
Cc: Blue Swirl <blauwirbel@gmail.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Dump guest page table inside QEMU makes system hang
Date: Thu, 23 Aug 2012 11:55:19 +0800 [thread overview]
Message-ID: <20120823035519.GA29310@cs.nctu.edu.tw> (raw)
In-Reply-To: <20120823025337.GA27969@cs.nctu.edu.tw>
> It's quite embarrassing. The code I posted before is buggy, and it dumps all
> 1024 * 1024 page table entries. It takes a lot of time, so that I think the
> system hangs. Attach is the code snipt what I am using, which works fine now.
> Another question is, I would like to know the hva corresponding to gpa (i.e.,
> the guest page pointed by guest pte). Do you happen to know there is such
> gpa2hva function in QEMU?
I think I found one, cpu_physical_memory_map (exec.c). Below is how I
convert gpa to hva by using cpu_physical_memory_map.
target_ulong pde_addr = (env->cr[3] + 32 * 4) & env->a20_mask;
target_phys_addr_t len = 4;
void *ptr = cpu_physical_memory_map(pde_addr, &len, 0);
The only thing I am not sure about is what value of len I should use.
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj
prev parent reply other threads:[~2012-08-23 3:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-21 7:21 [Qemu-devel] Dump guest page table inside QEMU makes system hang 陳韋任 (Wei-Ren Chen)
2012-08-21 18:19 ` Blue Swirl
2012-08-22 2:20 ` 陳韋任 (Wei-Ren Chen)
2012-08-22 12:06 ` Max Filippov
2012-08-23 2:53 ` 陳韋任 (Wei-Ren Chen)
2012-08-23 3:55 ` 陳韋任 (Wei-Ren Chen) [this message]
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