Commit 98511f35 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Stefano Stabellini
Browse files

xen: map a dummy page for local apic and ioapic in xen_set_fixmap 



Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent f731e3ef

arch/x86/xen/mmu.c

+20 −3
Original line number Diff line number Diff line
@@ -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;
@@ -1880,9 +1882,6 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot) 
# endif

#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:
@@ -1890,6 +1889,22 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot) 
		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. */