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From: Auger Eric <eric.auger@redhat.com>
To: qemu list <qemu-devel@nongnu.org>, qemu-arm <qemu-arm@nongnu.org>,
	Peter Maydell <peter.maydell@linaro.org>
Cc: Andrew Jones <drjones@redhat.com>, Wei Huang <wei@redhat.com>,
	Laszlo Ersek <lersek@redhat.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: [Qemu-devel] Expand ECAM region in machvirt 2_13?
Date: Tue, 1 May 2018 17:59:56 +0200	[thread overview]
Message-ID: <f41972e8-0ae2-7c1d-a66a-499a841080e3@redhat.com> (raw)

Hi,

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:
https://lists.gnu.org/archive/html/qemu-devel/2018-01/msg03631.html.

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.

Thanks

Eric

             reply	other threads:[~2018-05-01 16:00 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-01 15:59 Auger Eric [this message]
2018-05-02 11:31 ` [Qemu-devel] Expand ECAM region in machvirt 2_13? Laszlo Ersek
2018-05-02 12:34   ` Ard Biesheuvel
2018-05-02 13:54     ` Laszlo Ersek
2018-05-02 14:23       ` Ard Biesheuvel
2018-05-02 14:38         ` Auger Eric
2018-05-02 15:30           ` Laszlo Ersek

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