[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PATCH 37/64] acpi: pc: revert back to v5.2 PCI slot enumeration
From: |
Michael Roth |
Subject: |
[PATCH 37/64] acpi: pc: revert back to v5.2 PCI slot enumeration |
Date: |
Tue, 19 Oct 2021 09:09:17 -0500 |
From: Igor Mammedov <imammedo@redhat.com>
Commit [1] moved _SUN variable from only hot-pluggable to
all devices. This made linux kernel enumerate extra slots
that weren't present before. If extra slot happens to be
be enumerated first and there is a device in th same slot
but on other bridge, linux kernel will add -N suffix to
slot name of the later, thus changing NIC name compared to
QEMU 5.2. This in some case confuses systemd, if it is
using SLOT NIC naming scheme and interface name becomes
not the same as it was under QEMU-5.2.
Reproducer QEMU CLI:
-M pc-i440fx-5.2 -nodefaults \
-device pci-bridge,chassis_nr=1,id=pci.1,bus=pci.0,addr=0x3 \
-device virtio-net-pci,id=nic1,bus=pci.1,addr=0x1 \
-device virtio-net-pci,id=nic2,bus=pci.1,addr=0x2 \
-device virtio-net-pci,id=nic3,bus=pci.1,addr=0x3
with RHEL8 guest produces following results:
v5.2:
kernel: virtio_net virtio0 ens1: renamed from eth0
kernel: virtio_net virtio2 ens3: renamed from eth2
kernel: virtio_net virtio1 enp1s2: renamed from eth1
(slot 2 is assigned to empty bus 0 slot and virtio1
is assigned to 2-2 slot, and renaming falls back,
for some reason, to path based naming scheme)
v6.0:
kernel: virtio_net virtio0 ens1: renamed from eth0
kernel: virtio_net virtio2 ens3: renamed from eth2
systemd-udevd[299]: Error changing net interface name 'eth1' to 'ens3':
File exists
systemd-udevd[299]: could not rename interface '3' from 'eth1' to 'ens3':
File exists
(with commit [1] kernel assigns virtio2 to 3-2 slot
since bridge advertises _SUN=0x3 and kernel assigns
slot 3 to bridge. Still it manages to rename virtio2
correctly to ens3, however systemd gets confused with virtio1
where slot allocation exactly the same (2-2) as in 5.2 case
and tries to rename it to ens3 which is rightfully taken by
virtio2)
I'm not sure what breaks in systemd interface renaming (it probably
should be investigated), but on QEMU side we can safely revert
_SUN to 5.2 behavior (i.e. avoid cold-plugged bridges and non
hot-pluggable device classes), without breaking acpi-index, which uses
slot numbers but it doesn't have to use _SUN, it could use an arbitrary
variable name that has the same slot value).
It will help existing VMs to keep networking with non trivial
configs in working order since systemd will do its interface
renaming magic as it used to do.
1)
Fixes: b7f23f62e40 (pci: acpi: add _DSM method to PCI devices)
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20210624204229.998824-3-imammedo@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Tested-by: John Sucaet <john.sucaet@ekinops.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 7193d7cdd93e50f0e5f09803b98d27d3f9b147ac)
Signed-off-by: Michael Roth <michael.roth@amd.com>
---
hw/i386/acpi-build.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index de98750aef..dbee0cd3bc 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -432,11 +432,15 @@ static void build_append_pci_bus_devices(Aml
*parent_scope, PCIBus *bus,
aml_append(dev, aml_name_decl("_ADR", aml_int(slot << 16)));
if (bsel) {
- aml_append(dev, aml_name_decl("_SUN", aml_int(slot)));
+ /*
+ * Can't declare _SUN here for every device as it changes 'slot'
+ * enumeration order in linux kernel, so use another variable for
it
+ */
+ aml_append(dev, aml_name_decl("ASUN", aml_int(slot)));
method = aml_method("_DSM", 4, AML_SERIALIZED);
aml_append(method, aml_return(
aml_call6("PDSM", aml_arg(0), aml_arg(1), aml_arg(2),
- aml_arg(3), aml_name("BSEL"), aml_name("_SUN"))
+ aml_arg(3), aml_name("BSEL"), aml_name("ASUN"))
));
aml_append(dev, method);
}
@@ -463,6 +467,7 @@ static void build_append_pci_bus_devices(Aml *parent_scope,
PCIBus *bus,
aml_append(method, aml_return(aml_int(s3d)));
aml_append(dev, method);
} else if (hotplug_enabled_dev) {
+ aml_append(dev, aml_name_decl("_SUN", aml_int(slot)));
/* add _EJ0 to make slot hotpluggable */
method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
aml_append(method,
--
2.25.1
- [PATCH 28/64] crypto/tlscreds: Introduce qcrypto_tls_creds_check_endpoint() helper, (continued)
- [PATCH 28/64] crypto/tlscreds: Introduce qcrypto_tls_creds_check_endpoint() helper, Michael Roth, 2021/10/19
- [PATCH 29/64] block/nbd: Use qcrypto_tls_creds_check_endpoint(), Michael Roth, 2021/10/19
- [PATCH 30/64] qemu-nbd: Use qcrypto_tls_creds_check_endpoint(), Michael Roth, 2021/10/19
- [PATCH 02/64] linux-user/aarch64: Enable hwcap for RND, BTI, and MTE, Michael Roth, 2021/10/19
- [PATCH 31/64] chardev/socket: Use qcrypto_tls_creds_check_endpoint(), Michael Roth, 2021/10/19
- [PATCH 32/64] migration/tls: Use qcrypto_tls_creds_check_endpoint(), Michael Roth, 2021/10/19
- [PATCH 33/64] ui/vnc: Use qcrypto_tls_creds_check_endpoint(), Michael Roth, 2021/10/19
- [PATCH 34/64] crypto: Make QCryptoTLSCreds* structures private, Michael Roth, 2021/10/19
- [PATCH 35/64] yank: Unregister function when using TLS migration, Michael Roth, 2021/10/19
- [PATCH 36/64] tests: acpi: prepare for changing DSDT tables, Michael Roth, 2021/10/19
- [PATCH 37/64] acpi: pc: revert back to v5.2 PCI slot enumeration,
Michael Roth <=
- [PATCH 38/64] tests: acpi: pc: update expected DSDT blobs, Michael Roth, 2021/10/19
- [PATCH 39/64] hw/block/nvme: align with existing style, Michael Roth, 2021/10/19
- [PATCH 40/64] hw/nvme: fix missing check for PMR capability, Michael Roth, 2021/10/19
- [PATCH 03/64] docs/system: Document the removal of "compat" property for POWER CPUs, Michael Roth, 2021/10/19
- [PATCH 41/64] hw/nvme: fix pin-based interrupt behavior (again), Michael Roth, 2021/10/19
- [PATCH 42/64] virtio-balloon: don't start free page hinting if postcopy is possible, Michael Roth, 2021/10/19
- [PATCH 43/64] hw/net/can: sja1000 fix buff2frame_bas and buff2frame_pel when dlc is out of std CAN 8 bytes, Michael Roth, 2021/10/19
- [PATCH 44/64] hw/sd/sdcard: Document out-of-range addresses for SEND_WRITE_PROT, Michael Roth, 2021/10/19
- [PATCH 45/64] hw/sd/sdcard: Fix assertion accessing out-of-range addresses with CMD30, Michael Roth, 2021/10/19
- [PATCH 46/64] audio: Never send migration section, Michael Roth, 2021/10/19