[Qemu-devel] [PATCH 2/2] pcie_root_port: Disable ACS on older machines

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

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>
---
 hw/core/machine.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/core/machine.c b/hw/core/machine.c
index c58a8e594e..26a5f30e6d 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);
 
-- 
2.21.0