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[Qemu-devel] VFIO use of HOST_PAGE_ALIGN

From: Peter Crosthwaite
Subject: [Qemu-devel] VFIO use of HOST_PAGE_ALIGN
Date: Mon, 25 May 2015 00:48:13 -0700

Hi Alex and all,

I am working on a patch series to enable multiple CPU architectures to
run at once. It's a long story, but I have hit a snag in hw/vfio/pci.c
which AFAICS is the only in-tree system-mode use of HOST_PAGE_ALIGN
(all usermode code is a non-issue as not looking to support user-mode
multi-arch yet).

The problem I face, is that this macro depends on translate-all.c's
qemu_host_page_size which in turn, depends on TARGET_PAGE_SIZE. I'm
hoping that one day, TARGET_PAGE_SIZE will be a variable and the users
of it will know to get the correct value depending on their CPU
specific code location. vfio is the only one I can't handle. My
knowledge on vfio is near-0, but my thinking is, since this is not
arch specific code can we instead use the raw host page alignment
rather that the CPU arch specific one?


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