| Subject | [PATCH 29 of 38] xen: create dummy ioapic mapping | Date | Thu, 13 Nov 2008 11:10:27 -0800 | From | Jeremy Fitzhardinge <> |
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We don't allow direct access to the IO apic, so make sure that any request to map it just "maps" non-present pages. We should see any attempts at direct access explode nicely.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> --- arch/x86/xen/enlighten.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1166,6 +1166,16 @@ pte = pfn_pte(phys, prot); break; +#ifdef CONFIG_X86_IO_APIC + case FIX_IO_APIC_BASE_0 ... FIX_IO_APIC_BASE_END: + /* + * We just don't map the IO APIC - all access is via + * hypercalls. Keep the address in the pte for reference. + */ + pte = pfn_pte(phys, PAGE_NONE); + break; +#endif + case FIX_PARAVIRT_BOOTMAP: /* This is an MFN, but it isn't an IO mapping from the IO domain */
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