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lguest: use PGDIR_SHIFT for PAE code to allow different PAGE_OFFSET

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We still assume the Guest and Host have the same PAGE_OFFSET settings,
but now we don't assume 0xC0000000.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Matias Zabaljauregui <zabaljauregui@gmail.com>
This commit is contained in:
Rusty Russell 2009-09-23 22:26:46 -06:00
parent 4c1ea3dd71
commit fb100d78c0
1 changed files with 2 additions and 4 deletions
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6
drivers/lguest/page_tables.c
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@ -996,11 +996,9 @@ static unsigned long setup_pagetables(struct lguest *lg,
if (copy_to_user(&pgdir[0], &pgd, sizeof(pgd)) != 0)
return -EFAULT;
/*
* And the third PGD entry (ie. addresses 3G-4G).
*
* FIXME: This assumes that PAGE_OFFSET for the Guest is 0xC0000000.
* And the other PGD entry to make the linear mapping at PAGE_OFFSET
*/
if (copy_to_user(&pgdir[3], &pgd, sizeof(pgd)) != 0)
if (copy_to_user(&pgdir[KERNEL_PGD_BOUNDARY], &pgd, sizeof(pgd)))
return -EFAULT;
#else
/*