# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 655281bca306a06bbc88bcb19a7a603fc4b5684b
# Parent 8013b84df1ac0810ff7de34dcafcd6b36b4bd664
[HVM] pv drivers: Allocate hypercall area as an executable region.
We have to use __vmalloc() and __PAGE_KERNEL because vmalloc_exec()
and PAGE_KERNEL_EXEC are not exported to modules.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
unmodified_drivers/linux-2.6/platform-pci/platform-pci.c | 32 +++++++--------
1 files changed, 17 insertions(+), 15 deletions(-)
diff -r 8013b84df1ac -r 655281bca306
unmodified_drivers/linux-2.6/platform-pci/platform-pci.c
--- a/unmodified_drivers/linux-2.6/platform-pci/platform-pci.c Fri Sep 08
18:55:53 2006 +0100
+++ b/unmodified_drivers/linux-2.6/platform-pci/platform-pci.c Fri Sep 08
19:15:11 2006 +0100
@@ -17,6 +17,7 @@
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
*/
+
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
@@ -25,6 +26,8 @@
#include <linux/init.h>
#include <linux/version.h>
#include <linux/interrupt.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
@@ -47,7 +50,6 @@ MODULE_DESCRIPTION("Xen platform PCI dev
MODULE_DESCRIPTION("Xen platform PCI device");
MODULE_LICENSE("GPL");
-
unsigned long *phys_to_machine_mapping;
EXPORT_SYMBOL(phys_to_machine_mapping);
@@ -118,7 +120,7 @@ unsigned long alloc_xen_mmio(unsigned lo
/* Lifted from hvmloader.c */
static int get_hypercall_stubs(void)
{
- uint32_t eax, ebx, ecx, edx, pages, msr, order, i;
+ uint32_t eax, ebx, ecx, edx, pages, msr, i;
char signature[13];
cpuid(0x40000000, &eax, &ebx, &ecx, &edx);
@@ -141,22 +143,22 @@ static int get_hypercall_stubs(void)
cpuid(0x40000002, &pages, &msr, &ecx, &edx);
- i = pages - 1;
- for (order = 0; i != 0; order++)
- i >>= 1;
-
- printk(KERN_INFO "Hypercall area is %u pages (order %u allocation)\n",
- pages, order);
-
- hypercall_stubs = (void *)__get_free_pages(GFP_KERNEL, order);
+ printk(KERN_INFO "Hypercall area is %u pages.\n", pages);
+
+ /* Use __vmalloc() because vmalloc_exec() is not an exported symbol. */
+ /* PAGE_KERNEL_EXEC also is not exported, hence we use PAGE_KERNEL. */
+ /* hypercall_stubs = vmalloc_exec(pages * PAGE_SIZE); */
+ hypercall_stubs = __vmalloc(pages * PAGE_SIZE,
+ GFP_KERNEL | __GFP_HIGHMEM,
+ __pgprot(__PAGE_KERNEL & ~_PAGE_NX));
if (hypercall_stubs == NULL)
return -ENOMEM;
- for (i = 0; i < pages; i++)
- wrmsrl(msr,
- virt_to_phys(hypercall_stubs) + /* base address */
- (i << PAGE_SHIFT) + /* offset of page @i */
- i); /* request page @i */
+ for (i = 0; i < pages; i++) {
+ unsigned long pfn;
+ pfn = vmalloc_to_pfn((char *)hypercall_stubs + i*PAGE_SIZE);
+ wrmsrl(msr, ((u64)pfn << PAGE_SHIFT) + i);
+ }
return 0;
}
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