From 47436aa4ad054c1c7c8231618e86ebd9305308dc Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Mon, 22 Oct 2007 11:03:36 +1000 Subject: 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 --- include/linux/lguest.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'include/linux/lguest.h') diff --git a/include/linux/lguest.h b/include/linux/lguest.h index 083052236db..8beb2913462 100644 --- a/include/linux/lguest.h +++ b/include/linux/lguest.h @@ -44,11 +44,14 @@ 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 */ unsigned long noirq_start, noirq_end; - + /* Address above which page tables are all identical. */ + unsigned long kernel_address; /* The vector to try to use for system calls (0x40 or 0x80). */ unsigned int syscall_vec; }; -- cgit v1.2.3