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| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-09-03 14:55:16 +0100 |
|---|---|---|
| committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2010-10-22 21:25:44 +0100 |
| commit | 98511f3532eb7fce274f37d94f29790922799e15 (patch) | |
| tree | 7e44d06535592436115bca0317b14022d9da91c1 | |
| parent | f731e3ef02b4744f4d7ca2f63539b900e47db31f (diff) | |
| download | linux-98511f3532eb7fce274f37d94f29790922799e15.tar.gz linux-98511f3532eb7fce274f37d94f29790922799e15.tar.bz2 linux-98511f3532eb7fce274f37d94f29790922799e15.zip | |
xen: map a dummy page for local apic and ioapic in xen_set_fixmap
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
| -rw-r--r-- | arch/x86/xen/mmu.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 42086ac406af..ffc5e24a53ba 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -1861,6 +1861,8 @@ __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, } #endif /* CONFIG_X86_64 */ +static unsigned char dummy_mapping[PAGE_SIZE] __page_aligned_bss; + static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot) { pte_t pte; @@ -1881,15 +1883,28 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot) #else case VSYSCALL_LAST_PAGE ... VSYSCALL_FIRST_PAGE: #endif -#ifdef CONFIG_X86_LOCAL_APIC - case FIX_APIC_BASE: /* maps dummy local APIC */ -#endif case FIX_TEXT_POKE0: case FIX_TEXT_POKE1: /* All local page mappings */ pte = pfn_pte(phys, prot); break; +#ifdef CONFIG_X86_LOCAL_APIC + case FIX_APIC_BASE: /* maps dummy local APIC */ + pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL); + break; +#endif + +#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(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL); + break; +#endif + case FIX_PARAVIRT_BOOTMAP: /* This is an MFN, but it isn't an IO mapping from the IO domain */ @@ -2027,6 +2042,8 @@ void __init xen_init_mmu_ops(void) pv_mmu_ops = xen_mmu_ops; vmap_lazy_unmap = false; + + memset(dummy_mapping, 0xff, PAGE_SIZE); } /* Protected by xen_reservation_lock. */ |