* [PATCH] pci/pci_expander_bridge: migrate state of pxb/pxb-pcie devices.
@ 2022-08-11 16:49 Andrey Ryabinin
2022-08-13 16:23 ` Vladimir Sementsov-Ogievskiy
0 siblings, 1 reply; 3+ messages in thread
From: Andrey Ryabinin @ 2022-08-11 16:49 UTC (permalink / raw)
To: Eduardo Habkost, Marcel Apfelbaum, Philippe Mathieu-Daudé,
Yanan Wang, Michael S. Tsirkin
Cc: qemu-devel, yc-core, Andrey Ryabinin
pxb/pxb-pcie/pxb-cxl devices currently doesn't have vmstate description
So the state of device is not preserved during migration and
guest can notice that as change of PCI_COMMAND_* registers state.
The diff of lspci output before and after migration:
00:03.0 Host bridge [0600]: Red Hat, Inc. QEMU PCIe Expander bridge [1b36:000b]
Subsystem: Red Hat, Inc QEMU PCIe Expander bridge [1af4:1100]
- Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
+ Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Add VMStateDescription to pxb devices so their state is transferred
during migrations. For saving migration compatibility add
'x-config-reg-migration-enabled' property to pxb devices and disable
it for all released machine types.
Signed-off-by: Andrey Ryabinin <arbn@yandex-team.com>
---
hw/core/machine.c | 3 +++
hw/pci-bridge/pci_expander_bridge.c | 24 ++++++++++++++++++++++++
include/hw/pci/pci_bridge.h | 1 +
3 files changed, 28 insertions(+)
diff --git a/hw/core/machine.c b/hw/core/machine.c
index a673302ccec..071853469e2 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -43,6 +43,9 @@
GlobalProperty hw_compat_7_0[] = {
{ "arm-gicv3-common", "force-8-bit-prio", "on" },
{ "nvme-ns", "eui64-default", "on"},
+ { "pxb", "x-config-reg-migration-enabled", "off" },
+ { "pxb-cxl", "x-config-reg-migration-enabled", "off" },
+ { "pxb-pcie", "x-config-reg-migration-enabled", "off" },
};
const size_t hw_compat_7_0_len = G_N_ELEMENTS(hw_compat_7_0);
diff --git a/hw/pci-bridge/pci_expander_bridge.c b/hw/pci-bridge/pci_expander_bridge.c
index c9e817aa586..a3680d4d045 100644
--- a/hw/pci-bridge/pci_expander_bridge.c
+++ b/hw/pci-bridge/pci_expander_bridge.c
@@ -23,6 +23,7 @@
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "sysemu/numa.h"
+#include "migration/vmstate.h"
#include "hw/boards.h"
#include "qom/object.h"
@@ -404,9 +405,29 @@ static Property pxb_dev_properties[] = {
DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0),
DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED),
DEFINE_PROP_BOOL("bypass_iommu", PXBDev, bypass_iommu, false),
+ DEFINE_PROP_BOOL("x-config-reg-migration-enabled", PXBDev,
+ migratable, true),
DEFINE_PROP_END_OF_LIST(),
};
+static bool pxb_vmstate_needed(void *opaque)
+{
+ PXBDev *pxb = opaque;
+
+ return pxb->migratable;
+}
+
+static const VMStateDescription vmstate_pxb_device = {
+ .name = "pxb-pci",
+ .needed = pxb_vmstate_needed,
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_PCI_DEVICE(parent_obj, PXBDev),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static void pxb_dev_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
@@ -422,6 +443,7 @@ static void pxb_dev_class_init(ObjectClass *klass, void *data)
device_class_set_props(dc, pxb_dev_properties);
dc->hotpluggable = false;
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+ dc->vmsd = &vmstate_pxb_device;
}
static const TypeInfo pxb_dev_info = {
@@ -460,6 +482,7 @@ static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data)
device_class_set_props(dc, pxb_dev_properties);
dc->hotpluggable = false;
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+ dc->vmsd = &vmstate_pxb_device;
}
static const TypeInfo pxb_pcie_dev_info = {
@@ -504,6 +527,7 @@ static void pxb_cxl_dev_class_init(ObjectClass *klass, void *data)
/* Host bridges aren't hotpluggable. FIXME: spec reference */
dc->hotpluggable = false;
dc->reset = pxb_dev_reset;
+ dc->vmsd = &vmstate_pxb_device;
}
static const TypeInfo pxb_cxl_dev_info = {
diff --git a/include/hw/pci/pci_bridge.h b/include/hw/pci/pci_bridge.h
index ba4bafac7c2..404dc02e36e 100644
--- a/include/hw/pci/pci_bridge.h
+++ b/include/hw/pci/pci_bridge.h
@@ -91,6 +91,7 @@ struct PXBDev {
uint8_t bus_nr;
uint16_t numa_node;
bool bypass_iommu;
+ bool migratable;
struct cxl_dev {
CXLHost *cxl_host_bridge; /* Pointer to a CXLHost */
} cxl;
--
2.35.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] pci/pci_expander_bridge: migrate state of pxb/pxb-pcie devices.
2022-08-11 16:49 [PATCH] pci/pci_expander_bridge: migrate state of pxb/pxb-pcie devices Andrey Ryabinin
@ 2022-08-13 16:23 ` Vladimir Sementsov-Ogievskiy
2022-08-18 13:04 ` Dr. David Alan Gilbert
0 siblings, 1 reply; 3+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2022-08-13 16:23 UTC (permalink / raw)
To: Andrey Ryabinin, Eduardo Habkost, Marcel Apfelbaum,
Philippe Mathieu-Daudé,
Yanan Wang, Michael S. Tsirkin, Dr. David Alan Gilbert, quintela
Cc: qemu-devel, yc-core
[add migration maintainers]
On 8/11/22 19:49, Andrey Ryabinin wrote:
> pxb/pxb-pcie/pxb-cxl devices currently doesn't have vmstate description
> So the state of device is not preserved during migration and
> guest can notice that as change of PCI_COMMAND_* registers state.
>
> The diff of lspci output before and after migration:
>
> 00:03.0 Host bridge [0600]: Red Hat, Inc. QEMU PCIe Expander bridge [1b36:000b]
> Subsystem: Red Hat, Inc QEMU PCIe Expander bridge [1af4:1100]
> - Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
> + Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
> Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>
> Add VMStateDescription to pxb devices so their state is transferred
> during migrations. For saving migration compatibility add
> 'x-config-reg-migration-enabled' property to pxb devices and disable
> it for all released machine types.
>
> Signed-off-by: Andrey Ryabinin <arbn@yandex-team.com>
> ---
> hw/core/machine.c | 3 +++
> hw/pci-bridge/pci_expander_bridge.c | 24 ++++++++++++++++++++++++
> include/hw/pci/pci_bridge.h | 1 +
> 3 files changed, 28 insertions(+)
>
> diff --git a/hw/core/machine.c b/hw/core/machine.c
> index a673302ccec..071853469e2 100644
> --- a/hw/core/machine.c
> +++ b/hw/core/machine.c
> @@ -43,6 +43,9 @@
> GlobalProperty hw_compat_7_0[] = {
> { "arm-gicv3-common", "force-8-bit-prio", "on" },
> { "nvme-ns", "eui64-default", "on"},
> + { "pxb", "x-config-reg-migration-enabled", "off" },
> + { "pxb-cxl", "x-config-reg-migration-enabled", "off" },
> + { "pxb-pcie", "x-config-reg-migration-enabled", "off" },
Seems that it's too late for 7.1, rc2 is out and rc3 is coming soon. And that's not a degradation.
Up to maintainers, but I think we'd better start new hw_compat_7_1 for this thing.
> };
> const size_t hw_compat_7_0_len = G_N_ELEMENTS(hw_compat_7_0);
>
> diff --git a/hw/pci-bridge/pci_expander_bridge.c b/hw/pci-bridge/pci_expander_bridge.c
> index c9e817aa586..a3680d4d045 100644
> --- a/hw/pci-bridge/pci_expander_bridge.c
> +++ b/hw/pci-bridge/pci_expander_bridge.c
> @@ -23,6 +23,7 @@
> #include "qemu/error-report.h"
> #include "qemu/module.h"
> #include "sysemu/numa.h"
> +#include "migration/vmstate.h"
> #include "hw/boards.h"
> #include "qom/object.h"
>
> @@ -404,9 +405,29 @@ static Property pxb_dev_properties[] = {
> DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0),
> DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED),
> DEFINE_PROP_BOOL("bypass_iommu", PXBDev, bypass_iommu, false),
> + DEFINE_PROP_BOOL("x-config-reg-migration-enabled", PXBDev,
> + migratable, true),
With it, do we create a user-visible property? If so, is it possible to avoid it?
> DEFINE_PROP_END_OF_LIST(),
> };
>
> +static bool pxb_vmstate_needed(void *opaque)
> +{
> + PXBDev *pxb = opaque;
> +
> + return pxb->migratable;
> +}
> +
> +static const VMStateDescription vmstate_pxb_device = {
> + .name = "pxb-pci",
> + .needed = pxb_vmstate_needed,
> + .version_id = 1,
> + .minimum_version_id = 1,
> + .fields = (VMStateField[]) {
> + VMSTATE_PCI_DEVICE(parent_obj, PXBDev),
> + VMSTATE_END_OF_LIST()
> + }
> +};
> +
> static void pxb_dev_class_init(ObjectClass *klass, void *data)
> {
> DeviceClass *dc = DEVICE_CLASS(klass);
> @@ -422,6 +443,7 @@ static void pxb_dev_class_init(ObjectClass *klass, void *data)
> device_class_set_props(dc, pxb_dev_properties);
> dc->hotpluggable = false;
> set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
> + dc->vmsd = &vmstate_pxb_device;
> }
>
> static const TypeInfo pxb_dev_info = {
> @@ -460,6 +482,7 @@ static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data)
> device_class_set_props(dc, pxb_dev_properties);
> dc->hotpluggable = false;
> set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
> + dc->vmsd = &vmstate_pxb_device;
> }
>
> static const TypeInfo pxb_pcie_dev_info = {
> @@ -504,6 +527,7 @@ static void pxb_cxl_dev_class_init(ObjectClass *klass, void *data)
> /* Host bridges aren't hotpluggable. FIXME: spec reference */
> dc->hotpluggable = false;
> dc->reset = pxb_dev_reset;
> + dc->vmsd = &vmstate_pxb_device;
> }
>
> static const TypeInfo pxb_cxl_dev_info = {
> diff --git a/include/hw/pci/pci_bridge.h b/include/hw/pci/pci_bridge.h
> index ba4bafac7c2..404dc02e36e 100644
> --- a/include/hw/pci/pci_bridge.h
> +++ b/include/hw/pci/pci_bridge.h
> @@ -91,6 +91,7 @@ struct PXBDev {
> uint8_t bus_nr;
> uint16_t numa_node;
> bool bypass_iommu;
> + bool migratable;
> struct cxl_dev {
> CXLHost *cxl_host_bridge; /* Pointer to a CXLHost */
> } cxl;
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] pci/pci_expander_bridge: migrate state of pxb/pxb-pcie devices.
2022-08-13 16:23 ` Vladimir Sementsov-Ogievskiy
@ 2022-08-18 13:04 ` Dr. David Alan Gilbert
0 siblings, 0 replies; 3+ messages in thread
From: Dr. David Alan Gilbert @ 2022-08-18 13:04 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy
Cc: Andrey Ryabinin, Eduardo Habkost, Marcel Apfelbaum,
Philippe Mathieu-Daudé,
Yanan Wang, Michael S. Tsirkin, quintela, qemu-devel, yc-core
* Vladimir Sementsov-Ogievskiy (vsementsov@yandex-team.ru) wrote:
> [add migration maintainers]
Thanks,
> On 8/11/22 19:49, Andrey Ryabinin wrote:
> > pxb/pxb-pcie/pxb-cxl devices currently doesn't have vmstate description
> > So the state of device is not preserved during migration and
> > guest can notice that as change of PCI_COMMAND_* registers state.
> >
> > The diff of lspci output before and after migration:
> >
> > 00:03.0 Host bridge [0600]: Red Hat, Inc. QEMU PCIe Expander bridge [1b36:000b]
> > Subsystem: Red Hat, Inc QEMU PCIe Expander bridge [1af4:1100]
> > - Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
> > + Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
> > Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Do you notice any other symptoms other than that minor diff?
> > Add VMStateDescription to pxb devices so their state is transferred
> > during migrations. For saving migration compatibility add
> > 'x-config-reg-migration-enabled' property to pxb devices and disable
> > it for all released machine types.
> >
> > Signed-off-by: Andrey Ryabinin <arbn@yandex-team.com>
> > ---
> > hw/core/machine.c | 3 +++
> > hw/pci-bridge/pci_expander_bridge.c | 24 ++++++++++++++++++++++++
> > include/hw/pci/pci_bridge.h | 1 +
> > 3 files changed, 28 insertions(+)
> >
> > diff --git a/hw/core/machine.c b/hw/core/machine.c
> > index a673302ccec..071853469e2 100644
> > --- a/hw/core/machine.c
> > +++ b/hw/core/machine.c
> > @@ -43,6 +43,9 @@
> > GlobalProperty hw_compat_7_0[] = {
> > { "arm-gicv3-common", "force-8-bit-prio", "on" },
> > { "nvme-ns", "eui64-default", "on"},
> > + { "pxb", "x-config-reg-migration-enabled", "off" },
> > + { "pxb-cxl", "x-config-reg-migration-enabled", "off" },
> > + { "pxb-pcie", "x-config-reg-migration-enabled", "off" },
>
>
> Seems that it's too late for 7.1, rc2 is out and rc3 is coming soon. And that's not a degradation.
Yeh
> Up to maintainers, but I think we'd better start new hw_compat_7_1 for this thing.
Yep.
Dave
>
> > };
> > const size_t hw_compat_7_0_len = G_N_ELEMENTS(hw_compat_7_0);
> > diff --git a/hw/pci-bridge/pci_expander_bridge.c b/hw/pci-bridge/pci_expander_bridge.c
> > index c9e817aa586..a3680d4d045 100644
> > --- a/hw/pci-bridge/pci_expander_bridge.c
> > +++ b/hw/pci-bridge/pci_expander_bridge.c
> > @@ -23,6 +23,7 @@
> > #include "qemu/error-report.h"
> > #include "qemu/module.h"
> > #include "sysemu/numa.h"
> > +#include "migration/vmstate.h"
> > #include "hw/boards.h"
> > #include "qom/object.h"
> > @@ -404,9 +405,29 @@ static Property pxb_dev_properties[] = {
> > DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0),
> > DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED),
> > DEFINE_PROP_BOOL("bypass_iommu", PXBDev, bypass_iommu, false),
> > + DEFINE_PROP_BOOL("x-config-reg-migration-enabled", PXBDev,
> > + migratable, true),
>
> With it, do we create a user-visible property? If so, is it possible to avoid it?
>
> > DEFINE_PROP_END_OF_LIST(),
> > };
> > +static bool pxb_vmstate_needed(void *opaque)
> > +{
> > + PXBDev *pxb = opaque;
> > +
> > + return pxb->migratable;
> > +}
> > +
> > +static const VMStateDescription vmstate_pxb_device = {
> > + .name = "pxb-pci",
> > + .needed = pxb_vmstate_needed,
> > + .version_id = 1,
> > + .minimum_version_id = 1,
> > + .fields = (VMStateField[]) {
> > + VMSTATE_PCI_DEVICE(parent_obj, PXBDev),
> > + VMSTATE_END_OF_LIST()
> > + }
> > +};
> > +
> > static void pxb_dev_class_init(ObjectClass *klass, void *data)
> > {
> > DeviceClass *dc = DEVICE_CLASS(klass);
> > @@ -422,6 +443,7 @@ static void pxb_dev_class_init(ObjectClass *klass, void *data)
> > device_class_set_props(dc, pxb_dev_properties);
> > dc->hotpluggable = false;
> > set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
> > + dc->vmsd = &vmstate_pxb_device;
> > }
> > static const TypeInfo pxb_dev_info = {
> > @@ -460,6 +482,7 @@ static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data)
> > device_class_set_props(dc, pxb_dev_properties);
> > dc->hotpluggable = false;
> > set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
> > + dc->vmsd = &vmstate_pxb_device;
> > }
> > static const TypeInfo pxb_pcie_dev_info = {
> > @@ -504,6 +527,7 @@ static void pxb_cxl_dev_class_init(ObjectClass *klass, void *data)
> > /* Host bridges aren't hotpluggable. FIXME: spec reference */
> > dc->hotpluggable = false;
> > dc->reset = pxb_dev_reset;
> > + dc->vmsd = &vmstate_pxb_device;
> > }
> > static const TypeInfo pxb_cxl_dev_info = {
> > diff --git a/include/hw/pci/pci_bridge.h b/include/hw/pci/pci_bridge.h
> > index ba4bafac7c2..404dc02e36e 100644
> > --- a/include/hw/pci/pci_bridge.h
> > +++ b/include/hw/pci/pci_bridge.h
> > @@ -91,6 +91,7 @@ struct PXBDev {
> > uint8_t bus_nr;
> > uint16_t numa_node;
> > bool bypass_iommu;
> > + bool migratable;
> > struct cxl_dev {
> > CXLHost *cxl_host_bridge; /* Pointer to a CXLHost */
> > } cxl;
>
>
> --
> Best regards,
> Vladimir
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-08-18 13:09 UTC | newest]
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2022-08-11 16:49 [PATCH] pci/pci_expander_bridge: migrate state of pxb/pxb-pcie devices Andrey Ryabinin
2022-08-13 16:23 ` Vladimir Sementsov-Ogievskiy
2022-08-18 13:04 ` Dr. David Alan Gilbert
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