Commit 0c78441c authored by Glauber de Oliveira Costa's avatar Glauber de Oliveira Costa Committed by Rusty Russell
Browse files

lguest: map_switcher_in_guest() per-vcpu 



The switcher needs to be mapped per-vcpu, because different vcpus
will potentially have different page tables (they don't have to,
because threads will share the same).

So our first step is the make the function receive a vcpu struct

Signed-off-by: default avatarGlauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 177e449d

drivers/lguest/lg.h

+1 −1
Original line number Diff line number Diff line
@@ -168,7 +168,7 @@ void guest_pagetable_clear_all(struct lguest *lg); 
void guest_pagetable_flush_user(struct lguest *lg);

void guest_set_pte(struct lguest *lg, unsigned long gpgdir,

		   unsigned long vaddr, pte_t val);

void map_switcher_in_guest(struct lguest *lg, struct lguest_pages *pages);

void map_switcher_in_guest(struct lg_cpu *cpu, 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);

drivers/lguest/page_tables.c

+2 −1
Original line number Diff line number Diff line
@@ -634,8 +634,9 @@ void free_guest_pagetable(struct lguest *lg) 
 * Guest (and not the pages for other CPUs).  We have the appropriate PTE pages

 * for each CPU already set up, we just need to hook them in now we know which

 * Guest is about to run on this CPU. */

void map_switcher_in_guest(struct lguest *lg, struct lguest_pages *pages)

void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages)

{

	struct lguest *lg = cpu->lg;

	pte_t *switcher_pte_page = __get_cpu_var(switcher_pte_pages);

	pgd_t switcher_pgd;

	pte_t regs_pte;

drivers/lguest/x86/core.c

+1 −1
Original line number Diff line number Diff line
@@ -91,7 +91,7 @@ static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages) 
	pages->state.host_cr3 = __pa(current->mm->pgd);

	/* Set up the Guest's page tables to see this CPU's pages (and no

	 * other CPU's pages). */

	map_switcher_in_guest(lg, pages);

	map_switcher_in_guest(cpu, pages);

	/* Set up the two "TSS" members which tell the CPU what stack to use

	 * for traps which do directly into the Guest (ie. traps at privilege

	 * level 1). */