diff options
| author | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-22 05:03:36 +0400 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-23 09:49:54 +0400 |
| commit | 47436aa4ad054c1c7c8231618e86ebd9305308dc (patch) | |
| tree | a9ba6e0521f9116442144a86e781a3164ec86094 /drivers/lguest/hypercalls.c | |
| parent | c18acd73ffc209def08003a1927473096f66c5ad (diff) | |
| download | linux-47436aa4ad054c1c7c8231618e86ebd9305308dc.tar.xz | |
Boot with virtual == physical to get closer to native Linux.
1) This allows us to get alot closer to booting bzImages.
2) It means we don't have to know page_offset.
3) The Guest needs to modify the boot pagetables to create the
PAGE_OFFSET mapping before jumping to C code.
4) guest_pa() walks the page tables rather than using page_offset.
5) We don't use page_offset to figure out whether to emulate: it was
always kinda quesationable, and won't work for instructions done
before remapping (bzImage unpacking in particular).
6) We still want the kernel address for tlb flushing: have the initial
hypercall give us that, too.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/hypercalls.c')
| -rw-r--r-- | drivers/lguest/hypercalls.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c index 02d0ae268267..13b5f2f813de 100644 --- a/drivers/lguest/hypercalls.c +++ b/drivers/lguest/hypercalls.c @@ -181,15 +181,15 @@ static void initialize(struct lguest *lg) /* The Guest tells us where we're not to deliver interrupts by putting * the range of addresses into "struct lguest_data". */ if (get_user(lg->noirq_start, &lg->lguest_data->noirq_start) - || get_user(lg->noirq_end, &lg->lguest_data->noirq_end) - /* We tell the Guest that it can't use the top 4MB of virtual - * addresses used by the Switcher. */ - || put_user(4U*1024*1024, &lg->lguest_data->reserve_mem)) + || get_user(lg->noirq_end, &lg->lguest_data->noirq_end)) kill_guest(lg, "bad guest page %p", lg->lguest_data); /* We write the current time into the Guest's data page once now. */ write_timestamp(lg); + /* page_tables.c will also do some setup. */ + page_table_guest_data_init(lg); + /* This is the one case where the above accesses might have been the * first write to a Guest page. This may have caused a copy-on-write * fault, but the Guest might be referring to the old (read-only) |