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Re: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) ti
From: |
Lluís Vilanova |
Subject: |
Re: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time? |
Date: |
Mon, 18 Jun 2012 22:38:36 +0300 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.1.50 (gnu/linux) |
陳韋任 (Wei-Ren Chen) writes:
>> The reason why we want to do the measuring is we want to use KVM (sounds
>> crazy
>> idea) MMU virtualization to speedup the guest -> host memory address
>> translation.
>> I talked to some people on LinuxCon Japan, included Paolo, about this idea.
>> The
>> feedback I got is we can only use shadow page table rather than EPT/NPT to do
>> the address translation (if possible!) since different ISA (ARM and x86, for
>> example) have different page table format. Besides, QEMU has to use ioctl to
>> ask
>> KVM to get the translation result, but it's an overkill as the ARM page table
>> is quite simple, which can be done in user mode very fast.
> Anyone would like to give a comment on this? ;)
> From the talk with Laurent on #qemu, he said the way he thought of is
> translating GVA -> GPA manually (through software), then try to insert
> GPA -> HPA into EPT, that's the only way HW can help.
Sorry, but I don't see the benefit here.
Lluis
--
"And it's much the same thing with knowledge, for whenever you learn
something new, the whole world becomes that much richer."
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Tollbooth
- Re: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time?, (continued)
- Re: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time?, Laurent Desnogues, 2012/06/13
- Re: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time?, Wei-Ren Chen, 2012/06/18
- Re: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time?, Blue Swirl, 2012/06/18
- Re: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time?, Lluís Vilanova, 2012/06/18
- Re: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time?, Wei-Ren Chen, 2012/06/19
- Message not available
- Re: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time?, Lluís Vilanova, 2012/06/19
- Re: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time?,
Lluís Vilanova <=
- Message not available
- Message not available
- Message not available
- Re: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time?, Orit Wasserman, 2012/06/19
Re: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time?, Wei-Ren Chen, 2012/06/13