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Subject[patch 06/26] Xen-paravirt_ops: paravirt_ops: allocate a fixmap slot
Allocate a fixmap slot for use by a paravirt_ops implementation.  This
is intended for early-boot bootstrap mappings. Once the zones and
allocator have been set up, it would be better to use get_vm_area() to
allocate some virtual space.

Xen uses this to map the hypervisor's shared info page, which doesn't
have a pseudo-physical page number, and therefore can't be mapped
ordinarily. It is needed early because it contains the vcpu state,
including the interrupt mask.

Signed-off-by: Jeremy Fitzhardinge <>

include/asm-i386/fixmap.h | 3 +++
1 file changed, 3 insertions(+)

--- a/include/asm-i386/fixmap.h
+++ b/include/asm-i386/fixmap.h
@@ -86,6 +86,9 @@ enum fixed_addresses {
/* temporary boot-time mappings, used before ioremap() is functional */
#define NR_FIX_BTMAPS 16

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