diff options
| author | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2019-07-30 10:37:19 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2019-07-30 12:07:07 -0400 |
| commit | c8557f1b4873549fc231496f00003a9e5389c8dd (patch) | |
| tree | 31613e7076d6418824ee9be9240c5b26acd1ad59 | |
| parent | a58dfba20168dae18650ad70f47af99be55b1c45 (diff) | |
pcie_root_port: Disable ACS on older machines
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 <dgilbert@redhat.com>
Message-Id: <20190730093719.12958-3-dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
| -rw-r--r-- | hw/core/machine.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/hw/core/machine.c b/hw/core/machine.c index c4a2ab2282..28a475ad97 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -52,6 +52,7 @@ GlobalProperty hw_compat_3_1[] = { { "virtio-blk-device", "discard", "false" }, { "virtio-blk-device", "write-zeroes", "false" }, { "virtio-balloon-device", "qemu-4-0-config-size", "false" }, + { "pcie-root-port-base", "disable-acs", "true" }, /* Added in 4.1 */ }; const size_t hw_compat_3_1_len = G_N_ELEMENTS(hw_compat_3_1); |