reset virtio driver from device side

Question

According virtio specification v1.2 there is a DEVICE_NEEDS_RESET flag in device status register is available.

If i set this flag with interrupt in virtio_pci_common_cfg.mxix_config (or 1-bit of ISR) from device after successfull probe there are not any reset from driver is happens.

In linux kernel sources (https://elixir.bootlin.com/linux/v6.5.2/source/include/uapi/linux/virtio_config.h#L44) this bit define but not used (exept mlx5_vnet.c - custom device).

What is right way to initiate guest driver reset from device side?

Thanx.

Answer 1

According 2.1 Device Status Field of specification there is a DEVICE_NEEDS_RESET bit is enable for indicate to driver that the device has experienced an error.

In 2.1.2 Device Requirements: Device Status Field:

The device SHOULD set DEVICE_NEEDS_RESET when it enters an error state that a reset is needed. If DRIVER_OK is set, after it sets DEVICE_NEEDS_RESET, the device MUST send a device configuration change notification to the driver.

According 4.1.4.3 Common configuration structure layout, there are few type of notification (device to driver) is enable:

• common interrupt (config_msix_vector)

• queue interrupt (queue_msix_vector)

---

I play with virtio-pci-net deice. In general case, it hase 3 queue: tx, rx, control. Device driver set tx_msix=2, rx_msix=1, control_msix=0, config_msix_vector=0.

Device need reset case (my sequence):

• increse virtio_pci_common_cfg.config_generation
• set bit DEVICE_NEEDS_RESET in status register
• set common interrupt in config_msix_vector

But driver only check control queue settings at all.

What i am doing wrong?

---

some info from my stand.

Guest OS

$ uname -a
Linux v-desktop 5.19.0-21-generic #21-Ubuntu SMP PREEMPT_DYNAMIC Wed Oct 12 18:33:17 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

PCI config space

$ sudo lspci -vvvvvnnnxxxxxx -s 01:00.0
01:00.0 Ethernet controller [0200]: Red Hat, Inc. Virtio network device [1af4:1041] (rev 01)
    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-
    Latency: 0, Cache Line Size: 32 bytes
    Interrupt: pin A routed to IRQ 16
    Region 0: Memory at c0507000 (32-bit, non-prefetchable) [size=1K]
    Region 1: Memory at c0506000 (32-bit, non-prefetchable) [size=256]
    Capabilities: [50] MSI-X: Enable+ Count=4 Masked-
        Vector table: BAR=1 offset=00000000
        PBA: BAR=1 offset=00000080
    Capabilities: [5c] Power Management version 3
        Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
        Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [64] Express (v2) Endpoint, MSI 00
        DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
            ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset- SlotPowerLimit 25W
        DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
            RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
            MaxPayload 128 bytes, MaxReadReq 512 bytes
        DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend-
        LnkCap: Port #1, Speed 5GT/s, Width x4, ASPM not supported
            ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
        LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
            ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
        LnkSta: Speed 5GT/s, Width x4
            TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
        DevCap2: Completion Timeout: Not Supported, TimeoutDis- NROPrPrP- LTR-
             10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt+ EETLPPrefix-
             EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
             FRS- TPHComp- ExtTPHComp-
             AtomicOpsCap: 32bit- 64bit- 128bitCAS-
        DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR- 10BitTagReq- OBFF Disabled,
             AtomicOpsCtl: ReqEn-
        LnkCap2: Supported Link Speeds: 2.5-5GT/s, Crosslink- Retimer- 2Retimers- DRS-
        LnkCtl2: Target Link Speed: 5GT/s, EnterCompliance- SpeedDis-
             Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
             Compliance Preset/De-emphasis: -6dB de-emphasis, 0dB preshoot
        LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1-
             EqualizationPhase2- EqualizationPhase3- LinkEqualizationRequest-
             Retimer- 2Retimers- CrosslinkRes: unsupported
    Capabilities: [a0] Vendor Specific Information: VirtIO: CommonCfg
        BAR=0 offset=00000000 size=0000007c
    Capabilities: [b0] Vendor Specific Information: VirtIO: Notify
        BAR=0 offset=00000100 size=00000010 multiplier=00000001
    Capabilities: [c4] Vendor Specific Information: VirtIO: ISR
        BAR=0 offset=0000007c size=00000001
    Capabilities: [d4] Vendor Specific Information: VirtIO: DeviceCfg
        BAR=0 offset=00000080 size=00000018
    Capabilities: [e4] Vendor Specific Information: VirtIO: <unknown>
        BAR=0 offset=00000000 size=00000000
    Capabilities: [100 v1] Virtual Channel
        Caps:   LPEVC=0 RefClk=100ns PATEntryBits=1
        Arb:    Fixed- WRR32- WRR64- WRR128-
        Ctrl:   ArbSelect=Fixed
        Status: InProgress-
        VC0:    Caps:   PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
            Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
            Ctrl:   Enable- ID=0 ArbSelect=Fixed TC/VC=00
            Status: NegoPending- InProgress-
    Kernel driver in use: virtio-pci
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20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 40 00
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50: 11 5c 03 80 01 00 00 00 81 00 00 00 01 64 03 00
60: 00 00 00 00 10 a0 02 00 02 80 e8 07 10 28 00 00
70: 42 60 40 01 00 00 42 10 00 00 00 00 00 00 00 00
80: 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00
90: 06 00 00 00 02 00 01 00 00 00 00 00 00 00 00 00
a0: 09 b0 10 01 00 00 00 00 00 00 00 00 7c 00 00 00
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PCI BAR0

$ sudo dd if=/dev/mem skip=3226497024 bs=1 count=1000 | hd
00000000  01 00 00 00 1f 00 00 80  01 00 00 00 17 00 00 80  |................|
00000010  00 00 03 00 4f 01 02 00  00 02 00 00 01 00 08 00  |....O...........|
00000020  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000080  02 ac da 01 00 01 00 00  00 00 dc 05 e8 03 00 00  |................|
00000090  01 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000000a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
000003e0  00 00 00 00 00 00 00 00                           |........|
000003e8

interrupts

$ cat /proc/interrupts | grep "CPU\|virtio0"
           CPU0       CPU1       CPU2       CPU3       
 29:          1          0          0          0   PCI-MSI 524288-edge      virtio0-config
 30:          0          0          0          0   PCI-MSI 524289-edge      virtio0-input.0
 31:          0          0          0          0   PCI-MSI 524290-edge      virtio0-output.0

---

Thanks