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xen-devel
[Xen-devel] Re: [PATCH][ioemu] fix PCI bar mapping
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To: |
Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH][ioemu] fix PCI bar mapping |
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From: |
Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> |
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Date: |
Thu, 7 May 2009 12:12:12 +0100 |
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Cc: |
"Zhao, Yu" <yu.zhao@xxxxxxxxx>, "Ke, Liping" <liping.ke@xxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Cui, Dexuan" <dexuan.cui@xxxxxxxxx> |
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Thu, 07 May 2009 04:12:39 -0700 |
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Yuji Shimada writes ("Re: [PATCH][ioemu] fix PCI bar mapping"):
> pt_pci_read_config should not be used to read configuration registers.
> pt_pci_read_config emulates access to read the registers from guest
> software. Many functions which are not relevant are executed in
> pt_pci_read_config. So side effects may occur. Instead, you can use
> pc_read_word of libpci just to read configuration registers.
Should we be reverting Cui's patch and fix the problem some other
way ?
> Or, there is another approach. It is that you remove emu_mask from
> writable_mask in pt_cmd_reg_write. Then you can get the proper value
> from reg_entry->data.
It would be nice to get this sorted for the 3.4 release, which is
imminent ...
Ian.
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