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 --- arch/x86/lguest/boot.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'arch/x86/lguest/boot.c') diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c index 3a06b51..090f30c 100644 --- a/arch/x86/lguest/boot.c +++ b/arch/x86/lguest/boot.c @@ -86,6 +86,7 @@ struct lguest_data lguest_data = { .hcall_status = { [0 ... LHCALL_RING_SIZE-1] = 0xFF }, .noirq_start = (u32)lguest_noirq_start, .noirq_end = (u32)lguest_noirq_end, + .kernel_address = PAGE_OFFSET, .blocked_interrupts = { 1 }, /* Block timer interrupts */ .syscall_vec = SYSCALL_VECTOR, }; @@ -1033,11 +1034,7 @@ __init void lguest_init(void *boot) /*G:070 Now we've seen all the paravirt_ops, we return to * lguest_init() where the rest of the fairly chaotic boot setup - * occurs. - * - * The Host expects our first hypercall to tell it where our "struct - * lguest_data" is, so we do that first. */ - hcall(LHCALL_LGUEST_INIT, __pa(&lguest_data), 0, 0); + * occurs. */ /* The native boot code sets up initial page tables immediately after * the kernel itself, and sets init_pg_tables_end so they're not -- cgit v1.1