Re: [Xen-devel] [xen-unstable] Commit 2ca9fbd739b8a72b16dd790d0fff7b75f5488fb8 AMD IOMMU: allocate IRTE entries instead of using a static mapping, makes dom0 boot process stall several times.

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Monday, August 26, 2013, 1:23:01 PM, you wrote:

>>>> On 26.08.13 at 13:07, Sander Eikelenboom <linux@xxxxxxxxxxxxxx> wrote:
>> Don't know that for sure, will check if there are any related messages in 
>> dmesg
>> I only see it enabling HPET, but i don't see anything about MSI ..

> The primary indicator, if I'm not mistaken, would be 3 IRQs in
> /proc/interrupts that show type HPET_MSI (and I suspect you
> don't see any).

Ah found out why, another quirk and silently applying:

/*
 * HPET MSI on some boards (ATI SB700/SB800) has side effect on
 * floppy DMA. Disable HPET MSI on such platforms.
 * See erratum #27 (Misinterpreted MSI Requests May Result in
 * Corrupted LPC DMA Data) in AMD Publication #46837,
 * "SB700 Family Product Errata", Rev. 1.0, March 2010.
 */
static void force_disable_hpet_msi(struct pci_dev *unused)
{
        hpet_msi_disable = 1;
}

how many quirks can a machine have ...

>> And it seems to limit to 1 cstate ...

> With that, the absence of the entries above may not mean much.

> Jan




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