Re: [Xen-devel] [PATCH 5/6] xen-pt: Hide MSI-X from xen stubdoms

[Jason Andryuk <jandryuk@xxxxxxxxx>]

On Tue, Mar 12, 2019 at 11:15 AM Jason Andryuk <jandryuk@xxxxxxxxx> wrote:
<snip>
> I'll test to verify whether MSI-X works with
> permissive mode.

Dropping this patch and enabling permissive mode allowed MSI-X to work.

{"execute": "device_add", "arguments": {"driver":
"xen-pci-passthrough", "id": "xen-pci-pt_0000-03-00.0", "hostaddr":
"0000:00:01.00", "machine_addr": "0000:03:00.0", "permissive": true}}
[00:07.0] xen_pt_realize: Assigning real physical device 00:01.0 to devfn 0x38
[00:07.0] xen_pt_register_regions: IO region 0 registered
(size=0x00002000 base_addr=0xe1900000 type: 0x4)
[00:07.0] xen_pt_config_reg_init: Offset 0x000e mismatch!
Emulated=0x0080, host=0x0000, syncing to 0x0000.
[00:07.0] xen_pt_config_reg_init: Offset 0x0010 mismatch!
Emulated=0x0000, host=0xe1900004, syncing to 0xe1900004.
[00:07.0] xen_pt_config_reg_init: Offset 0x0052 mismatch!
Emulated=0x0000, host=0x01c3, syncing to 0x0003.
[00:07.0] xen_pt_config_reg_init: Offset 0x0072 mismatch!
Emulated=0x0000, host=0x0086, syncing to 0x0080.
[00:07.0] xen_pt_config_reg_init: Offset 0x00a4 mismatch!
Emulated=0x0000, host=0x8fc0, syncing to 0x8fc0.
[00:07.0] xen_pt_config_reg_init: Offset 0x00aa mismatch!
Emulated=0x0000, host=0x0010, syncing to 0x0010.
[00:07.0] xen_pt_config_reg_init: Offset 0x00b2 mismatch!
Emulated=0x0000, host=0x1011, syncing to 0x1011.
[00:07.0] xen_pt_msix_init: get MSI-X table BAR base 0xe1900000
[00:07.0] xen_pt_msix_init: table_off = 0x1000, total_entries = 8
[00:07.0] xen_pt_msix_init: mapping physical MSI-X table to 0x7ad6a82e4000
[00:07.0] xen_pt_config_reg_init: Offset 0x0092 mismatch!
Emulated=0x0000, host=0x0007, syncing to 0x0007.
[00:07.0] xen_pt_pci_intx: intx=1
[00:07.0] xen_pt_realize: Real physical device 00:01.0 registered successfully
{"return": {}}

hw/xen/xen_pt_msi.c:xen_pt_msix_init() calls open(/dev/mem) and mmaps
it, so I had to add CONFIG_DEVMEM to the stubdom linux .config.
Without /dev/mem:
[00:07.0] xen_pt_msix_init: get MSI-X table BAR base 0xe1900000
[00:07.0] xen_pt_msix_init: Error: Can't open /dev/mem: No such file
or directory
[00:07.0] xen_pt_msix_size_init: Error: Internal error: Invalid
xen_pt_msix_init.
Failed to initialize 12/15, type = 0x1, rc: -2
[00:07.0] xen_pt_msi_set_enable: disabling MSI.
free(): double free detected in tcache 2

[user@sys-usb ~]$ sudo lspci -v -s 00:07.0
00:07.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host
Controller (rev 04) (prog-if 30 [XHCI])
    Subsystem: Lenovo Device 21d2
    Physical Slot: 7
    Flags: bus master, fast devsel, latency 0, IRQ 44
    Memory at f2024000 (64-bit, non-prefetchable) [size=8K]
    Capabilities: [50] Power Management version 3
    Capabilities: [70] MSI: Enable- Count=1/1 Maskable- 64bit+
    Capabilities: [90] MSI-X: Enable+ Count=8 Masked-
    Capabilities: [a0] Express Endpoint, MSI 00
    Kernel driver in use: xhci_hcd
    Kernel modules: xhci_pci

Regards,
Jason

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