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-rw-r--r--hw/i386/pc_piix.c2
-rw-r--r--hw/i386/pc_q35.c2
-rw-r--r--hw/ppc/spapr.c7
-rw-r--r--hw/virtio/virtio-pci.c29
-rw-r--r--hw/virtio/virtio-pci.h5
-rw-r--r--include/hw/compat.h35
-rw-r--r--include/hw/i386/pc.h26
7 files changed, 62 insertions, 44 deletions
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 061f4d977a..ddc885e4ae 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -474,7 +474,7 @@ static QEMUMachine pc_i440fx_machine_v2_1 = {
.name = "pc-i440fx-2.1",
.init = pc_init_pci,
.compat_props = (GlobalProperty[]) {
- PC_COMPAT_2_1,
+ HW_COMPAT_2_1,
{ /* end of list */ }
},
};
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 9c44cd6e1d..f533a940f0 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -370,7 +370,7 @@ static QEMUMachine pc_q35_machine_v2_1 = {
.name = "pc-q35-2.1",
.init = pc_q35_init,
.compat_props = (GlobalProperty[]) {
- PC_COMPAT_2_1,
+ HW_COMPAT_2_1,
{ /* end of list */ }
},
};
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 45764a7032..0a2bfe6565 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -57,6 +57,8 @@
#include "trace.h"
#include "hw/nmi.h"
+#include "hw/compat.h"
+
#include <libfdt.h>
/* SLOF memory layout:
@@ -1689,10 +1691,15 @@ static const TypeInfo spapr_machine_info = {
static void spapr_machine_2_1_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
+ static GlobalProperty compat_props[] = {
+ HW_COMPAT_2_1,
+ { /* end of list */ }
+ };
mc->name = "pseries-2.1";
mc->desc = "pSeries Logical Partition (PAPR compliant) v2.1";
mc->is_default = 0;
+ mc->compat_props = compat_props;
}
static const TypeInfo spapr_machine_2_1_info = {
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index e490adeb80..dde1d73b56 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -86,9 +86,6 @@
* 12 is historical, and due to x86 page size. */
#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
-/* Flags track per-device state like workarounds for quirks in older guests. */
-#define VIRTIO_PCI_FLAG_BUS_MASTER_BUG (1 << 0)
-
static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
VirtIOPCIProxy *dev);
@@ -323,14 +320,6 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
proxy->pci_dev.config[PCI_COMMAND] |
PCI_COMMAND_MASTER, 1);
}
-
- /* Linux before 2.6.34 sets the device as OK without enabling
- the PCI device bus master bit. In this case we need to disable
- some safety checks. */
- if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
- !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
- proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
- }
break;
case VIRTIO_MSI_CONFIG_VECTOR:
msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
@@ -483,8 +472,7 @@ static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
pci_default_write_config(pci_dev, address, val, len);
if (range_covers_byte(address, len, PCI_COMMAND) &&
- !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER) &&
- !(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) {
+ !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
virtio_pci_stop_ioeventfd(proxy);
virtio_set_status(vdev, vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
}
@@ -895,11 +883,15 @@ static void virtio_pci_vmstate_change(DeviceState *d, bool running)
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
if (running) {
- /* Try to find out if the guest has bus master disabled, but is
- in ready state. Then we have a buggy guest OS. */
- if ((vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
+ /* Old QEMU versions did not set bus master enable on status write.
+ * Detect DRIVER set and enable it.
+ */
+ if ((proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION) &&
+ (vdev->status & VIRTIO_CONFIG_S_DRIVER) &&
!(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
- proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
+ pci_default_write_config(&proxy->pci_dev, PCI_COMMAND,
+ proxy->pci_dev.config[PCI_COMMAND] |
+ PCI_COMMAND_MASTER, 1);
}
virtio_pci_start_ioeventfd(proxy);
} else {
@@ -1040,10 +1032,11 @@ static void virtio_pci_reset(DeviceState *qdev)
virtio_pci_stop_ioeventfd(proxy);
virtio_bus_reset(bus);
msix_unuse_all_vectors(&proxy->pci_dev);
- proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
}
static Property virtio_pci_properties[] = {
+ DEFINE_PROP_BIT("virtio-pci-bus-master-bug-migration", VirtIOPCIProxy, flags,
+ VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT, false),
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
DEFINE_PROP_END_OF_LIST(),
};
diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
index 1cea157a47..8873b6d138 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -53,6 +53,11 @@ typedef struct VirtioBusClass VirtioPCIBusClass;
#define VIRTIO_PCI_BUS_CLASS(klass) \
OBJECT_CLASS_CHECK(VirtioPCIBusClass, klass, TYPE_VIRTIO_PCI_BUS)
+/* Need to activate work-arounds for buggy guests at vmstate load. */
+#define VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT 0
+#define VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION \
+ (1 << VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT)
+
/* Performance improves when virtqueue kick processing is decoupled from the
* vcpu thread using ioeventfd for some devices. */
#define VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT 1
diff --git a/include/hw/compat.h b/include/hw/compat.h
new file mode 100644
index 0000000000..313682a708
--- /dev/null
+++ b/include/hw/compat.h
@@ -0,0 +1,35 @@
+#ifndef HW_COMPAT_H
+#define HW_COMPAT_H
+
+#define HW_COMPAT_2_1 \
+ {\
+ .driver = "intel-hda",\
+ .property = "old_msi_addr",\
+ .value = "on",\
+ },{\
+ .driver = "VGA",\
+ .property = "qemu-extended-regs",\
+ .value = "off",\
+ },{\
+ .driver = "secondary-vga",\
+ .property = "qemu-extended-regs",\
+ .value = "off",\
+ },{\
+ .driver = "virtio-scsi-pci",\
+ .property = "any_layout",\
+ .value = "off",\
+ },{\
+ .driver = "usb-mouse",\
+ .property = "usb_version",\
+ .value = stringify(1),\
+ },{\
+ .driver = "usb-kbd",\
+ .property = "usb_version",\
+ .value = stringify(1),\
+ },{\
+ .driver = "virtio-pci",\
+ .property = "virtio-pci-bus-master-bug-migration",\
+ .value = "on",\
+ }
+
+#endif /* HW_COMPAT_H */
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index c4ee520e20..02a1d615a6 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -14,6 +14,7 @@
#include "sysemu/sysemu.h"
#include "hw/pci/pci.h"
#include "hw/boards.h"
+#include "hw/compat.h"
#define HPET_INTCAP "hpet-intcap"
@@ -301,31 +302,8 @@ int e820_add_entry(uint64_t, uint64_t, uint32_t);
int e820_get_num_entries(void);
bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
-#define PC_COMPAT_2_1 \
- {\
- .driver = "intel-hda",\
- .property = "old_msi_addr",\
- .value = "on",\
- },{\
- .driver = "VGA",\
- .property = "qemu-extended-regs",\
- .value = "off",\
- },{\
- .driver = "secondary-vga",\
- .property = "qemu-extended-regs",\
- .value = "off",\
- },{\
- .driver = "usb-mouse",\
- .property = "usb_version",\
- .value = stringify(1),\
- },{\
- .driver = "usb-kbd",\
- .property = "usb_version",\
- .value = stringify(1),\
- }
-
#define PC_COMPAT_2_0 \
- PC_COMPAT_2_1, \
+ HW_COMPAT_2_1, \
{\
.driver = "virtio-scsi-pci",\
.property = "any_layout",\
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-24 09:55:19 +0000