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[Qemu-devel] Expand ECAM region in machvirt 2_13?

From: Auger Eric
Subject: [Qemu-devel] Expand ECAM region in machvirt 2_13?
Date: Tue, 1 May 2018 17:59:56 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0


I would like to resume the discussion on extending the number of PCI
buses to 256 (as in Q35) as a follow-up of past discussions:

With the current 16MB ECAM region we are limited to 16 PCIe busses.

Could we envision to have a 256MB ECAM region and move it to another
location beyond 256GB, in virt2_13 machine type?

Current ECAM range within [0x3f000000, 0x40000000]
would be kept unchanged for legacy and when vms->highmem is set to false.
Migration from <2_13 to >=2_13 would be allowed whereas migration from
> =2.13 to <2.13 wouldn't.



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