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qemu-kvm/SOURCES/kvm-hw-pci-Disable-PCI_ERR_...

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From 3ac01bb90da12538898f95b2fb4e7f6bc1557eb3 Mon Sep 17 00:00:00 2001
From: Leonardo Bras <leobras@redhat.com>
Date: Tue, 2 May 2023 21:27:02 -0300
Subject: [PATCH 18/21] hw/pci: Disable PCI_ERR_UNCOR_MASK register for machine
type < 8.0
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Leonardo Brás <leobras@redhat.com>
RH-MergeRequest: 170: hw/pci: Disable PCI_ERR_UNCOR_MASK register for machine type < 8.0
RH-Bugzilla: 2189423
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [1/1] ad62dd5a8567f386770577513c00a0bf36bd3df1 (LeoBras/centos-qemu-kvm)
Since it's implementation on v8.0.0-rc0, having the PCI_ERR_UNCOR_MASK
set for machine types < 8.0 will cause migration to fail if the target
QEMU version is < 8.0.0 :
qemu-system-x86_64: get_pci_config_device: Bad config data: i=0x10a read: 40 device: 0 cmask: ff wmask: 0 w1cmask:0
qemu-system-x86_64: Failed to load PCIDevice:config
qemu-system-x86_64: Failed to load e1000e:parent_obj
qemu-system-x86_64: error while loading state for instance 0x0 of device '0000:00:02.0/e1000e'
qemu-system-x86_64: load of migration failed: Invalid argument
The above test migrated a 7.2 machine type from QEMU master to QEMU 7.2.0,
with this cmdline:
./qemu-system-x86_64 -M pc-q35-7.2 [-incoming XXX]
In order to fix this, property x-pcie-err-unc-mask was introduced to
control when PCI_ERR_UNCOR_MASK is enabled. This property is enabled by
default, but is disabled if machine type <= 7.2.
Fixes: 010746ae1d ("hw/pci/aer: Implement PCI_ERR_UNCOR_MASK register")
Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Leonardo Bras <leobras@redhat.com>
Message-Id: <20230503002701.854329-1-leobras@redhat.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Fixes: https://gitlab.com/qemu-project/qemu/-/issues/1576
Tested-by: Fiona Ebner <f.ebner@proxmox.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 5ed3dabe57dd9f4c007404345e5f5bf0e347317f)
Signed-off-by: Leonardo Bras <leobras@redhat.com>
---
hw/core/machine.c | 1 +
hw/pci/pci.c | 2 ++
hw/pci/pcie_aer.c | 11 +++++++----
include/hw/pci/pci.h | 2 ++
4 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 0e0120b7f2..c28702b690 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -43,6 +43,7 @@ GlobalProperty hw_compat_7_2[] = {
{ "e1000e", "migrate-timadj", "off" },
{ "virtio-mem", "x-early-migration", "false" },
{ "migration", "x-preempt-pre-7-2", "true" },
+ { TYPE_PCI_DEVICE, "x-pcie-err-unc-mask", "off" },
};
const size_t hw_compat_7_2_len = G_N_ELEMENTS(hw_compat_7_2);
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index def5000e7b..8ad4349e96 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -79,6 +79,8 @@ static Property pci_props[] = {
DEFINE_PROP_STRING("failover_pair_id", PCIDevice,
failover_pair_id),
DEFINE_PROP_UINT32("acpi-index", PCIDevice, acpi_index, 0),
+ DEFINE_PROP_BIT("x-pcie-err-unc-mask", PCIDevice, cap_present,
+ QEMU_PCIE_ERR_UNC_MASK_BITNR, true),
DEFINE_PROP_END_OF_LIST()
};
diff --git a/hw/pci/pcie_aer.c b/hw/pci/pcie_aer.c
index 103667c368..374d593ead 100644
--- a/hw/pci/pcie_aer.c
+++ b/hw/pci/pcie_aer.c
@@ -112,10 +112,13 @@ int pcie_aer_init(PCIDevice *dev, uint8_t cap_ver, uint16_t offset,
pci_set_long(dev->w1cmask + offset + PCI_ERR_UNCOR_STATUS,
PCI_ERR_UNC_SUPPORTED);
- pci_set_long(dev->config + offset + PCI_ERR_UNCOR_MASK,
- PCI_ERR_UNC_MASK_DEFAULT);
- pci_set_long(dev->wmask + offset + PCI_ERR_UNCOR_MASK,
- PCI_ERR_UNC_SUPPORTED);
+
+ if (dev->cap_present & QEMU_PCIE_ERR_UNC_MASK) {
+ pci_set_long(dev->config + offset + PCI_ERR_UNCOR_MASK,
+ PCI_ERR_UNC_MASK_DEFAULT);
+ pci_set_long(dev->wmask + offset + PCI_ERR_UNCOR_MASK,
+ PCI_ERR_UNC_SUPPORTED);
+ }
pci_set_long(dev->config + offset + PCI_ERR_UNCOR_SEVER,
PCI_ERR_UNC_SEVERITY_DEFAULT);
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index d5a40cd058..6dc6742fc4 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -207,6 +207,8 @@ enum {
QEMU_PCIE_EXTCAP_INIT = (1 << QEMU_PCIE_EXTCAP_INIT_BITNR),
#define QEMU_PCIE_CXL_BITNR 10
QEMU_PCIE_CAP_CXL = (1 << QEMU_PCIE_CXL_BITNR),
+#define QEMU_PCIE_ERR_UNC_MASK_BITNR 11
+ QEMU_PCIE_ERR_UNC_MASK = (1 << QEMU_PCIE_ERR_UNC_MASK_BITNR),
};
typedef struct PCIINTxRoute {
--
2.39.3