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    SubjectRe: 3.2.1 Unable to reset IRR messages on boot
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    On Tue, 2012-03-20 at 14:58 -0400, Konrad Rzeszutek Wilk wrote:
    > Then this fixes the issue - thought if there are more checks in the future
    > it will have to be redone..:
    >
    > diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
    > index 988828b..b8e2794 100644
    > --- a/arch/x86/xen/mmu.c
    > +++ b/arch/x86/xen/mmu.c
    > @@ -1859,6 +1859,7 @@ pgd_t * __init xen_setup_kernel_pagetable(pgd_t *pgd,
    > #endif /* CONFIG_X86_64 */
    >
    > static unsigned char dummy_mapping[PAGE_SIZE] __page_aligned_bss;
    > +static unsigned char fake_ioapic_mapping[PAGE_SIZE] __page_aligned_bss;
    >
    > static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
    > {
    > @@ -1899,7 +1900,7 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
    > * We just don't map the IO APIC - all access is via
    > * hypercalls. Keep the address in the pte for reference.
    > */
    > - pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
    > + pte = pfn_pte(PFN_DOWN(__pa(fake_ioapic_mapping)), PAGE_KERNEL);
    > break;
    > #endif
    >
    > @@ -2064,6 +2065,7 @@ void __init xen_init_mmu_ops(void)
    > pv_mmu_ops = xen_mmu_ops;
    >
    > memset(dummy_mapping, 0xff, PAGE_SIZE);
    > + memset(fake_ioapic_mapping, 0xfd, PAGE_SIZE);

    heh ;)

    I was referring to setting up something little more valid. Like
    IO_APIC_reg_01 showing value of 0x00170020 etc. As the gsi computation
    actually refers to the number of redirection table entries supported by
    the IO-APIC.

    Also does the dom0 see all the GSI's/io-apic's that the host sees or is
    it going to be just one io-apic? I was just wondering if the reg 01 need
    to be same as what the host sees?

    Anyways, instead of 0xfd, having sane fake register values will be a
    better start.

    thanks,
    suresh



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