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| From: | Avi Kivity |
| Subject: | Re: [Qemu-devel] [Question] dump memory when host pci device is used by guest |
| Date: | Tue, 25 Oct 2011 15:22:40 +0200 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110930 Thunderbird/7.0.1 |
On 10/25/2011 03:18 PM, Dave Anderson wrote: > > > > Crash uses a heuristic based on the IDT base to identify the base from > > migrate-to-file output. It also needs CR3 in order to read from virtual > > address. > > Just to clarify -- the need for the IDT base and cr3 is *only* true for > KVM dumps using the "savevm" format. > > With ELF-format kdumps, the phys_base is simply determined from the PT_LOAD > segment that describes the kernel's __START_KERNEL_map region. I don't know > why that couldn't be done in this proposed case. > > kvm has no idea where the kernel (if any) is running. The dump is taken without any guest cooperation. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.
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