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Re: [Qemu-devel] On x86 MMU modes
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] On x86 MMU modes |
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Date: |
Wed, 03 Jun 2015 10:22:46 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 03/06/2015 10:07, Sandhya Kumar wrote:
> Thanks again. One more question.
>
> On versions prior to the mentioned commit, is there any specific reason
> (in x86 source code of QEMU) to choose separate modes for address
> translations (of kernel and user mode)? Or was that done just for
> performance improvement?
It's because pages can be accessible only from kernel space, so the
protection bits for the pages can be different in the two TLBs.
Paolo
- [Qemu-devel] On x86 MMU modes, Sandhya Kumar, 2015/06/03
- Re: [Qemu-devel] On x86 MMU modes, Paolo Bonzini, 2015/06/03
- Re: [Qemu-devel] On x86 MMU modes, Sandhya Kumar, 2015/06/03
- Re: [Qemu-devel] On x86 MMU modes, Paolo Bonzini, 2015/06/03
- Re: [Qemu-devel] On x86 MMU modes, Sandhya Kumar, 2015/06/03
- Re: [Qemu-devel] On x86 MMU modes,
Paolo Bonzini <=
- Re: [Qemu-devel] On x86 MMU modes, Sandhya Kumar, 2015/06/03
- Re: [Qemu-devel] On x86 MMU modes, Peter Maydell, 2015/06/03
- Re: [Qemu-devel] On x86 MMU modes, Sandhya Kumar, 2015/06/06
- Re: [Qemu-devel] On x86 MMU modes, Peter Maydell, 2015/06/06
- Re: [Qemu-devel] On x86 MMU modes, Sandhya Kumar, 2015/06/07