Re: [Xen-devel] pvops-2.6.32 - Interrupt routing problem

[Bastian Blank <waldi@xxxxxxxxxx>]

On Mon, Mar 15, 2010 at 11:11:26AM +0100, Bastian Blank wrote:
> On Mon, Mar 15, 2010 at 12:30:32PM +0800, Zhang, Xiantao wrote:
> > Could you try the following patch ?  Currently, the GSI 0-15 's polarity 
> > and trigger mode are determined by hypervisor, and maybe hypervisor and 
> > dom0 has no agreement to determin them. Just follow dom0's setting with 
> > this patch, and I think it maybe work for you. 
> No, it does not. mp_register_gsi also disallows reprogramming of already
> setup IO-APIC entries. But if I force it with the following hack, it
> works. So I would assume this a bug in the hypervisor to setup the GSI
> without knowing anything about it.

Or are they pre-programmed by the BIOS?

IO-APIC info from Xen now:
(XEN) IO APIC #8......
(XEN) .... register #00: 08000000
(XEN) .......    : physical APIC id: 08
(XEN) .......    : Delivery Type: 0
(XEN) .......    : LTS          : 0
(XEN) .... register #01: 000F0011
(XEN) .......     : max redirection entries: 000F
(XEN) .......     : PRQ implemented: 0
(XEN) .......     : IO APIC version: 0011
(XEN) .... register #02: 08000000
(XEN) .......     : arbitration: 08
(XEN) .... IRQ redirection table:
(XEN)  NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:   
(XEN)  00 000 00  1    0    0   0   0    0    0    00
(XEN)  01 000 00  0    0    0   0   0    0    0    28
(XEN)  02 000 00  0    0    0   0   0    0    0    F0
(XEN)  03 000 00  0    0    0   0   0    0    0    30
(XEN)  04 000 00  0    0    0   0   0    0    0    F1
(XEN)  05 000 00  1    0    0   0   0    0    0    38
(XEN)  06 000 00  1    0    0   0   0    0    0    40
(XEN)  07 000 00  1    0    0   0   0    0    0    48
(XEN)  08 000 00  0    0    0   0   0    0    0    50
(XEN)  09 000 00  0    0    0   0   0    0    0    58
(XEN)  0a 000 00  1    0    0   0   0    0    0    60
(XEN)  0b 000 00  1    0    0   0   0    0    0    68
(XEN)  0c 000 00  0    0    0   0   0    0    0    70
(XEN)  0d 000 00  1    0    0   0   0    0    0    78
(XEN)  0e 00A 0A  0    1    0   1   0    0    0    9A
(XEN)  0f 000 00  1    0    0   0   0    0    0    90

If I read the code correctly, the 1 in the trigger line means level
triggered. But the Linux kernel still lists it as edge triggered.

Bastian

-- 
        "We have the right to survive!"
        "Not by killing others."
                -- Deela and Kirk, "Wink of An Eye", stardate 5710.5

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