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 --- drivers/lguest/lg.h | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) (limited to 'drivers/lguest/lg.h') diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index 7408cebe995e..e4845d7f0688 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -63,7 +63,7 @@ struct lguest /* This provides the offset to the base of guest-physical * memory in the Launcher. */ void __user *mem_base; - u32 page_offset; + unsigned long kernel_address; u32 cr2; int halted; int ts; @@ -165,6 +165,8 @@ void guest_set_pte(struct lguest *lg, unsigned long gpgdir, void map_switcher_in_guest(struct lguest *lg, struct lguest_pages *pages); int demand_page(struct lguest *info, unsigned long cr2, int errcode); void pin_page(struct lguest *lg, unsigned long vaddr); +unsigned long guest_pa(struct lguest *lg, unsigned long vaddr); +void page_table_guest_data_init(struct lguest *lg); /* /core.c: */ void lguest_arch_host_init(void); @@ -229,9 +231,5 @@ do { \ } while(0) /* (End of aside) :*/ -static inline unsigned long guest_pa(struct lguest *lg, unsigned long vaddr) -{ - return vaddr - lg->page_offset; -} #endif /* __ASSEMBLY__ */ #endif /* _LGUEST_H */ -- cgit v1.2.3