Re: FreeBSD image hangs during boot

[Laurent Vivier <Laurent.Vivier-6ktuUTfB/bM@public.gmane.org>]

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Aurelien Jarno wrote:
> Hi all,
> 
> That's not something new, but I never seen the problem mentioned here.
> FreeBSD does not work on KVM, approximately since the lapic merge.
> 
> However, that does not seem related to lapic, as using -no-kvm-irqchip
> does not help. With -no-kvm I get a page fault in kernel mode, while the
> normal QEMU (0.9.0 or CVS) does not have this problem.
> 
> This can be easily reproduced with the latest installation CD:
> ftp://ftp.freebsd.org/pub/FreeBSD/ISO-IMAGES-i386/6.2/6.2-RELEASE-i386-bootonly.iso
> 
> Cheers,
> Aurelien
> 

Digging in the FreeBSD sources I found the origin of the problem:

I added some ACPI traces:

   rsirq-0234 [13] RsIrqResource         : Invalid interrupt polarity/trigger in
 resource list, 10

Which is in /sys/contrib/dev/acpica/rsirq.c :


       /*
         * Check for HE, LL interrupts
         */
        switch (Temp8 & 0x09)
        {
        case 0x01: /* HE */
            OutputStruct->Data.Irq.EdgeLevel = ACPI_EDGE_SENSITIVE;
            OutputStruct->Data.Irq.ActiveHighLow = ACPI_ACTIVE_HIGH;
            break;

        case 0x08: /* LL */
            OutputStruct->Data.Irq.EdgeLevel = ACPI_LEVEL_SENSITIVE;
            OutputStruct->Data.Irq.ActiveHighLow = ACPI_ACTIVE_LOW;
            break;

        default:
            /*
             * Only _LL and _HE polarity/trigger interrupts
             * are allowed (ACPI spec, section "IRQ Format")
             * so 0x00 and 0x09 are illegal.
             */
            ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
                "Invalid interrupt polarity/trigger in resource list, %X\n", Tem
p8));
            return_ACPI_STATUS (AE_BAD_DATA);
        }

Conclusion, in kvm-userspace/bios/acpi-dsdt.dsl, if you have "ActiveHigh", you
must have "Edge" instead of "Level":

-                    IRQ (Level, ActiveHigh, Shared)
+                    IRQ (Edge, ActiveHigh, Shared)

But I found nothing in ACPI specification explaining the freeBSD behavior.

Avi, if you think this anlysis is correct I can provide the patch changing
"Level" to "Edge"...

Laurent

-- 
---------------- Laurent.Vivier-6ktuUTfB/bM@public.gmane.org  -----------------
"Given enough eyeballs, all bugs are shallow" E. S. Raymond


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