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Re: [Qemu-devel] [RFC PATCH 01/10] configure: factor out list of support
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [RFC PATCH 01/10] configure: factor out list of supported Xen/KVM targets |
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Date: |
Mon, 17 Sep 2012 19:09:08 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120828 Thunderbird/15.0 |
Il 17/09/2012 19:02, Peter Maydell ha scritto:
> If Xen requires 64 bit physaddrs it should probably just be asserting
> this here, not randomly changing target_phys_bits. In fact all the
> supported Xen target archs already have 64 bit physaddrs, so it's
> harmless. But if there ever were a target Xen arch which didn't support
> 64 bit phys addrs then the right approach would be to convert it to
> do so regardless of whether we were using Xen or not.
No, Xen does not require 64-bit physaddrs, but it supports them even if
you build it for 32-bit. Memory is accessed through a "hole" (the
mapcache) provided by the hypervisor, so that a 32-bit QEMU address
space is enough to run 64-bit guests. At least that's my understanding.
Paolo
[Qemu-devel] [RFC PATCH 08/10] configure: add --disable-tcg configure option, Paolo Bonzini, 2012/09/17
[Qemu-devel] [RFC PATCH 05/10] exec: small adjustments for TCG separation, Paolo Bonzini, 2012/09/17
[Qemu-devel] [RFC PATCH 06/10] monitor: disable info jit if !TCG, Paolo Bonzini, 2012/09/17