hw/pci-host/i440fx.c | 11 +++++++++++ hw/pci-host/q35.c | 11 +++++++++++ hw/pci/pci_host.c | 11 +++++++++++ hw/pci/pcie_host.c | 11 +++++++++++ include/hw/pci/pci_host.h | 10 ++++++++++ include/hw/pci/pcie_host.h | 10 ++++++++++ 6 files changed, 64 insertions(+)
From: Hogan Wang <king.wang@huawei.com>
The pci host config register is used to save PCI address for
read/write config data. If guest write a value to config register,
and then pause the vcpu to migrate, After the migration, the guest
continue to write pci config data, and the write data will be ignored
because of new qemu process lost the config register state.
Example:
1. guest booting in seabios.
2. guest enabled the SMM memory window in piix4_apmc_smm_setup, and
then try to close the SMM memory window.
3. pasued vcpu to finish migration.
4. guest close the SMM memory window fail becasue of config register
state lost.
5. guest continue to boot and crash in ipxe option ROM (SMM memory
window is enabled).
Due to the complex guest, the negative effect is unpredictable.
---
hw/pci-host/i440fx.c | 11 +++++++++++
hw/pci-host/q35.c | 11 +++++++++++
hw/pci/pci_host.c | 11 +++++++++++
hw/pci/pcie_host.c | 11 +++++++++++
include/hw/pci/pci_host.h | 10 ++++++++++
include/hw/pci/pcie_host.h | 10 ++++++++++
6 files changed, 64 insertions(+)
diff --git a/hw/pci-host/i440fx.c b/hw/pci-host/i440fx.c
index 8ed2417f0c..17705bb025 100644
--- a/hw/pci-host/i440fx.c
+++ b/hw/pci-host/i440fx.c
@@ -118,6 +118,16 @@ static const VMStateDescription vmstate_i440fx = {
}
};
+static const VMStateDescription vmstate_i440fx_pcihost = {
+ .name = "I440FX_PCIHost",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_PCI_HOST(parent_obj, I440FXState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static void i440fx_pcihost_get_pci_hole_start(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
@@ -398,6 +408,7 @@ static void i440fx_pcihost_class_init(ObjectClass *klass, void *data)
hc->root_bus_path = i440fx_pcihost_root_bus_path;
dc->realize = i440fx_pcihost_realize;
dc->fw_name = "pci";
+ dc->vmsd = &vmstate_i440fx_pcihost;
device_class_set_props(dc, i440fx_props);
/* Reason: needs to be wired up by pc_init1 */
dc->user_creatable = false;
diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
index b67cb9c29f..5e323be2e3 100644
--- a/hw/pci-host/q35.c
+++ b/hw/pci-host/q35.c
@@ -165,6 +165,16 @@ static void q35_host_get_pci_hole64_end(Object *obj, Visitor *v,
visit_type_uint64(v, name, &value, errp);
}
+static const VMStateDescription vmstate_q35_pcihost = {
+ .name = "Q35_PCIHost",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_PCIE_HOST(parent_obj, Q35PCIHost),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
/*
* NOTE: setting defaults for the mch.* fields in this table
* doesn't work, because mch is a separate QOM object that is
@@ -194,6 +204,7 @@ static void q35_host_class_init(ObjectClass *klass, void *data)
hc->root_bus_path = q35_host_root_bus_path;
dc->realize = q35_host_realize;
+ dc->vmsd = &vmstate_q35_pcihost;
device_class_set_props(dc, q35_host_props);
/* Reason: needs to be wired up by pc_q35_init */
dc->user_creatable = false;
diff --git a/hw/pci/pci_host.c b/hw/pci/pci_host.c
index ce7bcdb1d5..7cdd5a3ea3 100644
--- a/hw/pci/pci_host.c
+++ b/hw/pci/pci_host.c
@@ -24,6 +24,7 @@
#include "hw/pci/pci_host.h"
#include "qemu/module.h"
#include "hw/pci/pci_bus.h"
+#include "migration/vmstate.h"
#include "trace.h"
/* debug PCI */
@@ -200,6 +201,16 @@ const MemoryRegionOps pci_host_data_be_ops = {
.endianness = DEVICE_BIG_ENDIAN,
};
+const VMStateDescription vmstate_pcihost = {
+ .name = "PCIHost",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(config_reg, PCIHostState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static const TypeInfo pci_host_type_info = {
.name = TYPE_PCI_HOST_BRIDGE,
.parent = TYPE_SYS_BUS_DEVICE,
diff --git a/hw/pci/pcie_host.c b/hw/pci/pcie_host.c
index 3534006f99..a653c39bb7 100644
--- a/hw/pci/pcie_host.c
+++ b/hw/pci/pcie_host.c
@@ -24,6 +24,7 @@
#include "hw/pci/pcie_host.h"
#include "qemu/module.h"
#include "exec/address-spaces.h"
+#include "migration/vmstate.h"
/* a helper function to get a PCIDevice for a given mmconfig address */
static inline PCIDevice *pcie_dev_find_by_mmcfg_addr(PCIBus *s,
@@ -121,6 +122,16 @@ void pcie_host_mmcfg_update(PCIExpressHost *e,
memory_region_transaction_commit();
}
+const VMStateDescription vmstate_pciehost = {
+ .name = "PCIEHost",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_PCI_HOST(pci, PCIExpressHost),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static const TypeInfo pcie_host_type_info = {
.name = TYPE_PCIE_HOST_BRIDGE,
.parent = TYPE_PCI_HOST_BRIDGE,
diff --git a/include/hw/pci/pci_host.h b/include/hw/pci/pci_host.h
index 9ce088bd13..fc88305e04 100644
--- a/include/hw/pci/pci_host.h
+++ b/include/hw/pci/pci_host.h
@@ -70,4 +70,14 @@ extern const MemoryRegionOps pci_host_conf_be_ops;
extern const MemoryRegionOps pci_host_data_le_ops;
extern const MemoryRegionOps pci_host_data_be_ops;
+extern const VMStateDescription vmstate_pcihost;
+
+#define VMSTATE_PCI_HOST(_field, _state) { \
+ .name = (stringify(_field)), \
+ .size = sizeof(PCIHostState), \
+ .vmsd = &vmstate_pcihost, \
+ .flags = VMS_STRUCT, \
+ .offset = vmstate_offset_value(_state, _field, PCIHostState),\
+}
+
#endif /* PCI_HOST_H */
diff --git a/include/hw/pci/pcie_host.h b/include/hw/pci/pcie_host.h
index 3f7b9886d1..a91ba0241a 100644
--- a/include/hw/pci/pcie_host.h
+++ b/include/hw/pci/pcie_host.h
@@ -78,4 +78,14 @@ void pcie_host_mmcfg_update(PCIExpressHost *e,
PCIE_MMCFG_DEVFN_MASK)
#define PCIE_MMCFG_CONFOFFSET(addr) ((addr) & PCIE_MMCFG_CONFOFFSET_MASK)
+extern const VMStateDescription vmstate_pciehost;
+
+#define VMSTATE_PCIE_HOST(_field, _state) { \
+ .name = (stringify(_field)), \
+ .size = sizeof(PCIExpressHost), \
+ .vmsd = &vmstate_pcihost, \
+ .flags = VMS_STRUCT, \
+ .offset = vmstate_offset_value(_state, _field, PCIExpressHost),\
+}
+
#endif /* PCIE_HOST_H */
--
2.23.0
On 07/23/20 12:49, Wang King wrote:
> From: Hogan Wang <king.wang@huawei.com>
>
> The pci host config register is used to save PCI address for
> read/write config data. If guest write a value to config register,
> and then pause the vcpu to migrate, After the migration, the guest
> continue to write pci config data, and the write data will be ignored
> because of new qemu process lost the config register state.
>
> Example:
> 1. guest booting in seabios.
> 2. guest enabled the SMM memory window in piix4_apmc_smm_setup, and
> then try to close the SMM memory window.
> 3. pasued vcpu to finish migration.
> 4. guest close the SMM memory window fail becasue of config register
> state lost.
> 5. guest continue to boot and crash in ipxe option ROM (SMM memory
> window is enabled).
>
> Due to the complex guest, the negative effect is unpredictable.
> ---
> hw/pci-host/i440fx.c | 11 +++++++++++
> hw/pci-host/q35.c | 11 +++++++++++
> hw/pci/pci_host.c | 11 +++++++++++
> hw/pci/pcie_host.c | 11 +++++++++++
> include/hw/pci/pci_host.h | 10 ++++++++++
> include/hw/pci/pcie_host.h | 10 ++++++++++
> 6 files changed, 64 insertions(+)
>
> diff --git a/hw/pci-host/i440fx.c b/hw/pci-host/i440fx.c
> index 8ed2417f0c..17705bb025 100644
> --- a/hw/pci-host/i440fx.c
> +++ b/hw/pci-host/i440fx.c
> @@ -118,6 +118,16 @@ static const VMStateDescription vmstate_i440fx = {
> }
> };
>
> +static const VMStateDescription vmstate_i440fx_pcihost = {
> + .name = "I440FX_PCIHost",
> + .version_id = 1,
> + .minimum_version_id = 1,
> + .fields = (VMStateField[]) {
> + VMSTATE_PCI_HOST(parent_obj, I440FXState),
> + VMSTATE_END_OF_LIST()
> + }
> +};
> +
> static void i440fx_pcihost_get_pci_hole_start(Object *obj, Visitor *v,
> const char *name, void *opaque,
> Error **errp)
> @@ -398,6 +408,7 @@ static void i440fx_pcihost_class_init(ObjectClass *klass, void *data)
> hc->root_bus_path = i440fx_pcihost_root_bus_path;
> dc->realize = i440fx_pcihost_realize;
> dc->fw_name = "pci";
> + dc->vmsd = &vmstate_i440fx_pcihost;
> device_class_set_props(dc, i440fx_props);
> /* Reason: needs to be wired up by pc_init1 */
> dc->user_creatable = false;
> diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
> index b67cb9c29f..5e323be2e3 100644
> --- a/hw/pci-host/q35.c
> +++ b/hw/pci-host/q35.c
> @@ -165,6 +165,16 @@ static void q35_host_get_pci_hole64_end(Object *obj, Visitor *v,
> visit_type_uint64(v, name, &value, errp);
> }
>
> +static const VMStateDescription vmstate_q35_pcihost = {
> + .name = "Q35_PCIHost",
> + .version_id = 1,
> + .minimum_version_id = 1,
> + .fields = (VMStateField[]) {
> + VMSTATE_PCIE_HOST(parent_obj, Q35PCIHost),
> + VMSTATE_END_OF_LIST()
> + }
> +};
> +
> /*
> * NOTE: setting defaults for the mch.* fields in this table
> * doesn't work, because mch is a separate QOM object that is
> @@ -194,6 +204,7 @@ static void q35_host_class_init(ObjectClass *klass, void *data)
>
> hc->root_bus_path = q35_host_root_bus_path;
> dc->realize = q35_host_realize;
> + dc->vmsd = &vmstate_q35_pcihost;
> device_class_set_props(dc, q35_host_props);
> /* Reason: needs to be wired up by pc_q35_init */
> dc->user_creatable = false;
> diff --git a/hw/pci/pci_host.c b/hw/pci/pci_host.c
> index ce7bcdb1d5..7cdd5a3ea3 100644
> --- a/hw/pci/pci_host.c
> +++ b/hw/pci/pci_host.c
> @@ -24,6 +24,7 @@
> #include "hw/pci/pci_host.h"
> #include "qemu/module.h"
> #include "hw/pci/pci_bus.h"
> +#include "migration/vmstate.h"
> #include "trace.h"
>
> /* debug PCI */
> @@ -200,6 +201,16 @@ const MemoryRegionOps pci_host_data_be_ops = {
> .endianness = DEVICE_BIG_ENDIAN,
> };
>
> +const VMStateDescription vmstate_pcihost = {
> + .name = "PCIHost",
> + .version_id = 1,
> + .minimum_version_id = 1,
> + .fields = (VMStateField[]) {
> + VMSTATE_UINT32(config_reg, PCIHostState),
> + VMSTATE_END_OF_LIST()
> + }
> +};
> +
> static const TypeInfo pci_host_type_info = {
> .name = TYPE_PCI_HOST_BRIDGE,
> .parent = TYPE_SYS_BUS_DEVICE,
> diff --git a/hw/pci/pcie_host.c b/hw/pci/pcie_host.c
> index 3534006f99..a653c39bb7 100644
> --- a/hw/pci/pcie_host.c
> +++ b/hw/pci/pcie_host.c
> @@ -24,6 +24,7 @@
> #include "hw/pci/pcie_host.h"
> #include "qemu/module.h"
> #include "exec/address-spaces.h"
> +#include "migration/vmstate.h"
>
> /* a helper function to get a PCIDevice for a given mmconfig address */
> static inline PCIDevice *pcie_dev_find_by_mmcfg_addr(PCIBus *s,
> @@ -121,6 +122,16 @@ void pcie_host_mmcfg_update(PCIExpressHost *e,
> memory_region_transaction_commit();
> }
>
> +const VMStateDescription vmstate_pciehost = {
> + .name = "PCIEHost",
> + .version_id = 1,
> + .minimum_version_id = 1,
> + .fields = (VMStateField[]) {
> + VMSTATE_PCI_HOST(pci, PCIExpressHost),
> + VMSTATE_END_OF_LIST()
> + }
> +};
> +
> static const TypeInfo pcie_host_type_info = {
> .name = TYPE_PCIE_HOST_BRIDGE,
> .parent = TYPE_PCI_HOST_BRIDGE,
> diff --git a/include/hw/pci/pci_host.h b/include/hw/pci/pci_host.h
> index 9ce088bd13..fc88305e04 100644
> --- a/include/hw/pci/pci_host.h
> +++ b/include/hw/pci/pci_host.h
> @@ -70,4 +70,14 @@ extern const MemoryRegionOps pci_host_conf_be_ops;
> extern const MemoryRegionOps pci_host_data_le_ops;
> extern const MemoryRegionOps pci_host_data_be_ops;
>
> +extern const VMStateDescription vmstate_pcihost;
> +
> +#define VMSTATE_PCI_HOST(_field, _state) { \
> + .name = (stringify(_field)), \
> + .size = sizeof(PCIHostState), \
> + .vmsd = &vmstate_pcihost, \
> + .flags = VMS_STRUCT, \
> + .offset = vmstate_offset_value(_state, _field, PCIHostState),\
> +}
> +
> #endif /* PCI_HOST_H */
> diff --git a/include/hw/pci/pcie_host.h b/include/hw/pci/pcie_host.h
> index 3f7b9886d1..a91ba0241a 100644
> --- a/include/hw/pci/pcie_host.h
> +++ b/include/hw/pci/pcie_host.h
> @@ -78,4 +78,14 @@ void pcie_host_mmcfg_update(PCIExpressHost *e,
> PCIE_MMCFG_DEVFN_MASK)
> #define PCIE_MMCFG_CONFOFFSET(addr) ((addr) & PCIE_MMCFG_CONFOFFSET_MASK)
>
> +extern const VMStateDescription vmstate_pciehost;
> +
> +#define VMSTATE_PCIE_HOST(_field, _state) { \
> + .name = (stringify(_field)), \
> + .size = sizeof(PCIExpressHost), \
> + .vmsd = &vmstate_pcihost, \
> + .flags = VMS_STRUCT, \
> + .offset = vmstate_offset_value(_state, _field, PCIExpressHost),\
> +}
> +
> #endif /* PCIE_HOST_H */
>
I won't claim that I understand half of what's going on, but the
"vmstate_pciehost" object is never used. The VMSTATE_PCIE_HOST macro
refers to "vmstate_pcihost", not "vmstate_pciehost".
Thanks
Laszlo
On Thu, Jul 23, 2020 at 01:48:47PM +0200, Laszlo Ersek wrote:
> On 07/23/20 12:49, Wang King wrote:
> > From: Hogan Wang <king.wang@huawei.com>
> >
> > The pci host config register is used to save PCI address for
> > read/write config data. If guest write a value to config register,
> > and then pause the vcpu to migrate, After the migration, the guest
> > continue to write pci config data, and the write data will be ignored
> > because of new qemu process lost the config register state.
> >
> > Example:
> > 1. guest booting in seabios.
> > 2. guest enabled the SMM memory window in piix4_apmc_smm_setup, and
> > then try to close the SMM memory window.
> > 3. pasued vcpu to finish migration.
> > 4. guest close the SMM memory window fail becasue of config register
> > state lost.
> > 5. guest continue to boot and crash in ipxe option ROM (SMM memory
> > window is enabled).
> >
> > Due to the complex guest, the negative effect is unpredictable.
Is there a way to build a unit test for this btw?
That would be great ...
> > ---
> > hw/pci-host/i440fx.c | 11 +++++++++++
> > hw/pci-host/q35.c | 11 +++++++++++
> > hw/pci/pci_host.c | 11 +++++++++++
> > hw/pci/pcie_host.c | 11 +++++++++++
> > include/hw/pci/pci_host.h | 10 ++++++++++
> > include/hw/pci/pcie_host.h | 10 ++++++++++
> > 6 files changed, 64 insertions(+)
> >
> > diff --git a/hw/pci-host/i440fx.c b/hw/pci-host/i440fx.c
> > index 8ed2417f0c..17705bb025 100644
> > --- a/hw/pci-host/i440fx.c
> > +++ b/hw/pci-host/i440fx.c
> > @@ -118,6 +118,16 @@ static const VMStateDescription vmstate_i440fx = {
> > }
> > };
> >
> > +static const VMStateDescription vmstate_i440fx_pcihost = {
> > + .name = "I440FX_PCIHost",
> > + .version_id = 1,
> > + .minimum_version_id = 1,
> > + .fields = (VMStateField[]) {
> > + VMSTATE_PCI_HOST(parent_obj, I440FXState),
> > + VMSTATE_END_OF_LIST()
> > + }
> > +};
> > +
> > static void i440fx_pcihost_get_pci_hole_start(Object *obj, Visitor *v,
> > const char *name, void *opaque,
> > Error **errp)
> > @@ -398,6 +408,7 @@ static void i440fx_pcihost_class_init(ObjectClass *klass, void *data)
> > hc->root_bus_path = i440fx_pcihost_root_bus_path;
> > dc->realize = i440fx_pcihost_realize;
> > dc->fw_name = "pci";
> > + dc->vmsd = &vmstate_i440fx_pcihost;
> > device_class_set_props(dc, i440fx_props);
> > /* Reason: needs to be wired up by pc_init1 */
> > dc->user_creatable = false;
> > diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
> > index b67cb9c29f..5e323be2e3 100644
> > --- a/hw/pci-host/q35.c
> > +++ b/hw/pci-host/q35.c
> > @@ -165,6 +165,16 @@ static void q35_host_get_pci_hole64_end(Object *obj, Visitor *v,
> > visit_type_uint64(v, name, &value, errp);
> > }
> >
> > +static const VMStateDescription vmstate_q35_pcihost = {
> > + .name = "Q35_PCIHost",
> > + .version_id = 1,
> > + .minimum_version_id = 1,
> > + .fields = (VMStateField[]) {
> > + VMSTATE_PCIE_HOST(parent_obj, Q35PCIHost),
> > + VMSTATE_END_OF_LIST()
> > + }
> > +};
> > +
> > /*
> > * NOTE: setting defaults for the mch.* fields in this table
> > * doesn't work, because mch is a separate QOM object that is
> > @@ -194,6 +204,7 @@ static void q35_host_class_init(ObjectClass *klass, void *data)
> >
> > hc->root_bus_path = q35_host_root_bus_path;
> > dc->realize = q35_host_realize;
> > + dc->vmsd = &vmstate_q35_pcihost;
> > device_class_set_props(dc, q35_host_props);
> > /* Reason: needs to be wired up by pc_q35_init */
> > dc->user_creatable = false;
> > diff --git a/hw/pci/pci_host.c b/hw/pci/pci_host.c
> > index ce7bcdb1d5..7cdd5a3ea3 100644
> > --- a/hw/pci/pci_host.c
> > +++ b/hw/pci/pci_host.c
> > @@ -24,6 +24,7 @@
> > #include "hw/pci/pci_host.h"
> > #include "qemu/module.h"
> > #include "hw/pci/pci_bus.h"
> > +#include "migration/vmstate.h"
> > #include "trace.h"
> >
> > /* debug PCI */
> > @@ -200,6 +201,16 @@ const MemoryRegionOps pci_host_data_be_ops = {
> > .endianness = DEVICE_BIG_ENDIAN,
> > };
> >
> > +const VMStateDescription vmstate_pcihost = {
> > + .name = "PCIHost",
> > + .version_id = 1,
> > + .minimum_version_id = 1,
> > + .fields = (VMStateField[]) {
> > + VMSTATE_UINT32(config_reg, PCIHostState),
> > + VMSTATE_END_OF_LIST()
> > + }
> > +};
> > +
> > static const TypeInfo pci_host_type_info = {
> > .name = TYPE_PCI_HOST_BRIDGE,
> > .parent = TYPE_SYS_BUS_DEVICE,
> > diff --git a/hw/pci/pcie_host.c b/hw/pci/pcie_host.c
> > index 3534006f99..a653c39bb7 100644
> > --- a/hw/pci/pcie_host.c
> > +++ b/hw/pci/pcie_host.c
> > @@ -24,6 +24,7 @@
> > #include "hw/pci/pcie_host.h"
> > #include "qemu/module.h"
> > #include "exec/address-spaces.h"
> > +#include "migration/vmstate.h"
> >
> > /* a helper function to get a PCIDevice for a given mmconfig address */
> > static inline PCIDevice *pcie_dev_find_by_mmcfg_addr(PCIBus *s,
> > @@ -121,6 +122,16 @@ void pcie_host_mmcfg_update(PCIExpressHost *e,
> > memory_region_transaction_commit();
> > }
> >
> > +const VMStateDescription vmstate_pciehost = {
> > + .name = "PCIEHost",
> > + .version_id = 1,
> > + .minimum_version_id = 1,
> > + .fields = (VMStateField[]) {
> > + VMSTATE_PCI_HOST(pci, PCIExpressHost),
> > + VMSTATE_END_OF_LIST()
> > + }
> > +};
> > +
> > static const TypeInfo pcie_host_type_info = {
> > .name = TYPE_PCIE_HOST_BRIDGE,
> > .parent = TYPE_PCI_HOST_BRIDGE,
> > diff --git a/include/hw/pci/pci_host.h b/include/hw/pci/pci_host.h
> > index 9ce088bd13..fc88305e04 100644
> > --- a/include/hw/pci/pci_host.h
> > +++ b/include/hw/pci/pci_host.h
> > @@ -70,4 +70,14 @@ extern const MemoryRegionOps pci_host_conf_be_ops;
> > extern const MemoryRegionOps pci_host_data_le_ops;
> > extern const MemoryRegionOps pci_host_data_be_ops;
> >
> > +extern const VMStateDescription vmstate_pcihost;
> > +
> > +#define VMSTATE_PCI_HOST(_field, _state) { \
> > + .name = (stringify(_field)), \
> > + .size = sizeof(PCIHostState), \
> > + .vmsd = &vmstate_pcihost, \
> > + .flags = VMS_STRUCT, \
> > + .offset = vmstate_offset_value(_state, _field, PCIHostState),\
> > +}
> > +
> > #endif /* PCI_HOST_H */
> > diff --git a/include/hw/pci/pcie_host.h b/include/hw/pci/pcie_host.h
> > index 3f7b9886d1..a91ba0241a 100644
> > --- a/include/hw/pci/pcie_host.h
> > +++ b/include/hw/pci/pcie_host.h
> > @@ -78,4 +78,14 @@ void pcie_host_mmcfg_update(PCIExpressHost *e,
> > PCIE_MMCFG_DEVFN_MASK)
> > #define PCIE_MMCFG_CONFOFFSET(addr) ((addr) & PCIE_MMCFG_CONFOFFSET_MASK)
> >
> > +extern const VMStateDescription vmstate_pciehost;
> > +
> > +#define VMSTATE_PCIE_HOST(_field, _state) { \
> > + .name = (stringify(_field)), \
> > + .size = sizeof(PCIExpressHost), \
> > + .vmsd = &vmstate_pcihost, \
> > + .flags = VMS_STRUCT, \
> > + .offset = vmstate_offset_value(_state, _field, PCIExpressHost),\
> > +}
> > +
> > #endif /* PCIE_HOST_H */
> >
>
> I won't claim that I understand half of what's going on, but the
> "vmstate_pciehost" object is never used. The VMSTATE_PCIE_HOST macro
> refers to "vmstate_pcihost", not "vmstate_pciehost".
>
> Thanks
> Laszlo
On Thu, Jul 23, 2020 at 06:49:35PM +0800, Wang King wrote:
> From: Hogan Wang <king.wang@huawei.com>
>
> The pci host config register is used to save PCI address for
> read/write config data. If guest write a value to config register,
> and then pause the vcpu to migrate, After the migration, the guest
> continue to write pci config data, and the write data will be ignored
> because of new qemu process lost the config register state.
Wow I can't believe we have such a bug after so many years.
Question is, this will break cross-version migration if we just add it.
Could we use some trick so people can upgrade in the field
without breaking migration?
I regret we still don't have an extensible format where we could
add fields without breaking everything ...
CC Julua, Dgilbert to take a look.
> Example:
> 1. guest booting in seabios.
> 2. guest enabled the SMM memory window in piix4_apmc_smm_setup, and
> then try to close the SMM memory window.
> 3. pasued vcpu to finish migration.
> 4. guest close the SMM memory window fail becasue of config register
> state lost.
> 5. guest continue to boot and crash in ipxe option ROM (SMM memory
> window is enabled).
>
> Due to the complex guest, the negative effect is unpredictable.
Could we get a sign-off please?
The sign-off is a simple line at the end of the explanation for the
patch, which certifies that you wrote it or otherwise have the right to
pass it on as an open-source patch. The rules are pretty simple: if you
can certify the below:
Developer's Certificate of Origin 1.1
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
By making a contribution to this project, I certify that:
(a) The contribution was created in whole or in part by me and I
have the right to submit it under the open source license
indicated in the file; or
(b) The contribution is based upon previous work that, to the best
of my knowledge, is covered under an appropriate open source
license and I have the right under that license to submit that
work with modifications, whether created in whole or in part
by me, under the same open source license (unless I am
permitted to submit under a different license), as indicated
in the file; or
(c) The contribution was provided directly to me by some other
person who certified (a), (b) or (c) and I have not modified
it.
(d) I understand and agree that this project and the contribution
are public and that a record of the contribution (including all
personal information I submit with it, including my sign-off) is
maintained indefinitely and may be redistributed consistent with
this project or the open source license(s) involved.
then you just add a line saying::
Signed-off-by: Random J Developer <random@developer.example.org>
using your real name (sorry, no pseudonyms or anonymous contributions.)
> ---
> hw/pci-host/i440fx.c | 11 +++++++++++
> hw/pci-host/q35.c | 11 +++++++++++
> hw/pci/pci_host.c | 11 +++++++++++
> hw/pci/pcie_host.c | 11 +++++++++++
> include/hw/pci/pci_host.h | 10 ++++++++++
> include/hw/pci/pcie_host.h | 10 ++++++++++
> 6 files changed, 64 insertions(+)
>
> diff --git a/hw/pci-host/i440fx.c b/hw/pci-host/i440fx.c
> index 8ed2417f0c..17705bb025 100644
> --- a/hw/pci-host/i440fx.c
> +++ b/hw/pci-host/i440fx.c
> @@ -118,6 +118,16 @@ static const VMStateDescription vmstate_i440fx = {
> }
> };
>
> +static const VMStateDescription vmstate_i440fx_pcihost = {
> + .name = "I440FX_PCIHost",
> + .version_id = 1,
> + .minimum_version_id = 1,
> + .fields = (VMStateField[]) {
> + VMSTATE_PCI_HOST(parent_obj, I440FXState),
> + VMSTATE_END_OF_LIST()
> + }
> +};
> +
> static void i440fx_pcihost_get_pci_hole_start(Object *obj, Visitor *v,
> const char *name, void *opaque,
> Error **errp)
> @@ -398,6 +408,7 @@ static void i440fx_pcihost_class_init(ObjectClass *klass, void *data)
> hc->root_bus_path = i440fx_pcihost_root_bus_path;
> dc->realize = i440fx_pcihost_realize;
> dc->fw_name = "pci";
> + dc->vmsd = &vmstate_i440fx_pcihost;
> device_class_set_props(dc, i440fx_props);
> /* Reason: needs to be wired up by pc_init1 */
> dc->user_creatable = false;
> diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
> index b67cb9c29f..5e323be2e3 100644
> --- a/hw/pci-host/q35.c
> +++ b/hw/pci-host/q35.c
> @@ -165,6 +165,16 @@ static void q35_host_get_pci_hole64_end(Object *obj, Visitor *v,
> visit_type_uint64(v, name, &value, errp);
> }
>
> +static const VMStateDescription vmstate_q35_pcihost = {
> + .name = "Q35_PCIHost",
> + .version_id = 1,
> + .minimum_version_id = 1,
> + .fields = (VMStateField[]) {
> + VMSTATE_PCIE_HOST(parent_obj, Q35PCIHost),
> + VMSTATE_END_OF_LIST()
> + }
> +};
> +
> /*
> * NOTE: setting defaults for the mch.* fields in this table
> * doesn't work, because mch is a separate QOM object that is
> @@ -194,6 +204,7 @@ static void q35_host_class_init(ObjectClass *klass, void *data)
>
> hc->root_bus_path = q35_host_root_bus_path;
> dc->realize = q35_host_realize;
> + dc->vmsd = &vmstate_q35_pcihost;
> device_class_set_props(dc, q35_host_props);
> /* Reason: needs to be wired up by pc_q35_init */
> dc->user_creatable = false;
> diff --git a/hw/pci/pci_host.c b/hw/pci/pci_host.c
> index ce7bcdb1d5..7cdd5a3ea3 100644
> --- a/hw/pci/pci_host.c
> +++ b/hw/pci/pci_host.c
> @@ -24,6 +24,7 @@
> #include "hw/pci/pci_host.h"
> #include "qemu/module.h"
> #include "hw/pci/pci_bus.h"
> +#include "migration/vmstate.h"
> #include "trace.h"
>
> /* debug PCI */
> @@ -200,6 +201,16 @@ const MemoryRegionOps pci_host_data_be_ops = {
> .endianness = DEVICE_BIG_ENDIAN,
> };
>
> +const VMStateDescription vmstate_pcihost = {
> + .name = "PCIHost",
> + .version_id = 1,
> + .minimum_version_id = 1,
> + .fields = (VMStateField[]) {
> + VMSTATE_UINT32(config_reg, PCIHostState),
> + VMSTATE_END_OF_LIST()
> + }
> +};
> +
> static const TypeInfo pci_host_type_info = {
> .name = TYPE_PCI_HOST_BRIDGE,
> .parent = TYPE_SYS_BUS_DEVICE,
> diff --git a/hw/pci/pcie_host.c b/hw/pci/pcie_host.c
> index 3534006f99..a653c39bb7 100644
> --- a/hw/pci/pcie_host.c
> +++ b/hw/pci/pcie_host.c
> @@ -24,6 +24,7 @@
> #include "hw/pci/pcie_host.h"
> #include "qemu/module.h"
> #include "exec/address-spaces.h"
> +#include "migration/vmstate.h"
>
> /* a helper function to get a PCIDevice for a given mmconfig address */
> static inline PCIDevice *pcie_dev_find_by_mmcfg_addr(PCIBus *s,
> @@ -121,6 +122,16 @@ void pcie_host_mmcfg_update(PCIExpressHost *e,
> memory_region_transaction_commit();
> }
>
> +const VMStateDescription vmstate_pciehost = {
> + .name = "PCIEHost",
> + .version_id = 1,
> + .minimum_version_id = 1,
> + .fields = (VMStateField[]) {
> + VMSTATE_PCI_HOST(pci, PCIExpressHost),
> + VMSTATE_END_OF_LIST()
> + }
> +};
> +
> static const TypeInfo pcie_host_type_info = {
> .name = TYPE_PCIE_HOST_BRIDGE,
> .parent = TYPE_PCI_HOST_BRIDGE,
> diff --git a/include/hw/pci/pci_host.h b/include/hw/pci/pci_host.h
> index 9ce088bd13..fc88305e04 100644
> --- a/include/hw/pci/pci_host.h
> +++ b/include/hw/pci/pci_host.h
> @@ -70,4 +70,14 @@ extern const MemoryRegionOps pci_host_conf_be_ops;
> extern const MemoryRegionOps pci_host_data_le_ops;
> extern const MemoryRegionOps pci_host_data_be_ops;
>
> +extern const VMStateDescription vmstate_pcihost;
> +
> +#define VMSTATE_PCI_HOST(_field, _state) { \
> + .name = (stringify(_field)), \
> + .size = sizeof(PCIHostState), \
> + .vmsd = &vmstate_pcihost, \
> + .flags = VMS_STRUCT, \
> + .offset = vmstate_offset_value(_state, _field, PCIHostState),\
> +}
> +
> #endif /* PCI_HOST_H */
> diff --git a/include/hw/pci/pcie_host.h b/include/hw/pci/pcie_host.h
> index 3f7b9886d1..a91ba0241a 100644
> --- a/include/hw/pci/pcie_host.h
> +++ b/include/hw/pci/pcie_host.h
> @@ -78,4 +78,14 @@ void pcie_host_mmcfg_update(PCIExpressHost *e,
> PCIE_MMCFG_DEVFN_MASK)
> #define PCIE_MMCFG_CONFOFFSET(addr) ((addr) & PCIE_MMCFG_CONFOFFSET_MASK)
>
> +extern const VMStateDescription vmstate_pciehost;
> +
> +#define VMSTATE_PCIE_HOST(_field, _state) { \
> + .name = (stringify(_field)), \
> + .size = sizeof(PCIExpressHost), \
> + .vmsd = &vmstate_pcihost, \
> + .flags = VMS_STRUCT, \
> + .offset = vmstate_offset_value(_state, _field, PCIExpressHost),\
> +}
> +
> #endif /* PCIE_HOST_H */
> --
> 2.23.0
>
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