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Message-Id: <ec3f3830cce7c4753c97.1226603427@abulafia.goop.org> Date: Thu, 13 Nov 2008 11:10:27 -0800 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Ingo Molnar <mingo@...e.hu> Cc: linux-kernel@...r.kernel.org, Xen-devel <xen-devel@...ts.xensource.com>, the arch/x86 maintainers <x86@...nel.org>, Ian Campbell <ian.campbell@...rix.com> Subject: [PATCH 29 of 38] xen: create dummy ioapic mapping 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@...rix.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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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