[Xen-devel] [PATCH] acpi: Switch to dynamic mapping at SYS_STATE_boot

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

We can switch ACPI from using fixmap to dynamic mapping as soon as
the system enters SYS_STATE_boot. This will allow us, for example,
to map MADT on systems with large number of processors where the
table might not fit into NUM_FIXMAP_ACPI_PAGES (currently set to 4).

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
 xen/drivers/acpi/osl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/drivers/acpi/osl.c b/xen/drivers/acpi/osl.c
index 3616dfd..7199047 100644
--- a/xen/drivers/acpi/osl.c
+++ b/xen/drivers/acpi/osl.c
@@ -89,7 +89,7 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
 void __iomem *
 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 {
-       if (system_state >= SYS_STATE_active) {
+       if (system_state >= SYS_STATE_boot) {
                mfn_t mfn = _mfn(PFN_DOWN(phys));
                unsigned int offs = phys & (PAGE_SIZE - 1);
 
@@ -104,7 +104,7 @@ acpi_os_map_memory(acpi_physical_address phys, acpi_size 
size)
 
 void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 {
-       if (system_state >= SYS_STATE_active)
+       if (system_state >= SYS_STATE_boot)
                vunmap((void *)((unsigned long)virt & PAGE_MASK));
 }
 
-- 
1.8.3.1


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