|
From: | Juan Quintela |
Subject: | Re: [Qemu-devel] [PATCH 2/2] pcie_root_port: Disable ACS on older machines |
Date: | Tue, 30 Jul 2019 15:42:23 +0200 |
User-agent: | Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux) |
"Dr. David Alan Gilbert (git)" <address@hidden> wrote: > From: "Dr. David Alan Gilbert" <address@hidden> > > ACS got added in 4.0 unconditionally, that broke older<->4.0 migration > where there was a PCIe root port. > Fix this by turning it off for 3.1 and older machines; note this > fixes compatibility for older QEMUs but breaks compatibility with 4.0 > for older machine types. > > machine type source qemu dest qemu > 3.1 3.1 4.0 broken > 3.1 3.1 4.1rc2 broken > 3.1 3.1 4.1+this OK ++ > 3.1 4.0 4.1rc2 OK > 3.1 4.0 4.1+this broken -- > 4.0 4.0 4.1rc2 OK > 4.0 4.0 4.1+this OK > > So we gain and lose; the consensus seems to be treat this as a > fix for older machine types. > > Signed-off-by: Dr. David Alan Gilbert <address@hidden> > --- Reviewed-by: Juan Quintela <address@hidden>
[Prev in Thread] | Current Thread | [Next in Thread] |