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authorRusty Russell <rusty@rustcorp.com.au>2011-07-22 14:39:48 +0930
committerRusty Russell <rusty@rustcorp.com.au>2011-07-22 14:39:48 +0930
commit5dea1c88ed11a1221581c4b202f053c4fc138704 (patch)
tree59e15d3c696712e26ffb229ff987f33bcc72affe /include/linux/lguest.h
parente0377e25206328998d036cafddcd00a7c3252e3e (diff)
lguest: use a special 1:1 linear pagetable mode until first switch.
The Host used to create some page tables for the Guest to use at the top of Guest memory; it would then tell the Guest where this was. In particular, it created linear mappings for 0 and 0xC0000000 addresses because lguest used to switch to its real page tables quite late in boot. However, since d50d8fe19 Linux initialized boot page tables in head_32.S even before the "are we lguest?" boot jump. So, now we can simplify things: the Host pagetable code assumes 1:1 linear mapping until it first calls the LHCALL_NEW_PGTABLE hypercall, which we now do before we reach C code. This also means that the Host doesn't need to know anything about the Guest's PAGE_OFFSET. (Non-Linux guests might not even have such a thing). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux/lguest.h')
-rw-r--r--include/linux/lguest.h2
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/lguest.h b/include/linux/lguest.h
index 2fb1dcbcb5aa..9962c6bb1311 100644
--- a/include/linux/lguest.h
+++ b/include/linux/lguest.h
@@ -59,8 +59,6 @@ struct lguest_data {
unsigned long reserve_mem;
/* KHz for the TSC clock. */
u32 tsc_khz;
- /* Page where the top-level pagetable is */
- unsigned long pgdir;
/* Fields initialized by the Guest at boot: */
/* Instruction range to suppress interrupts even if enabled */