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lguest: map_switcher_in_guest() per-vcpu

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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: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Glauber de Oliveira Costa 2008-01-07 11:05:30 -02:00 committed by Rusty Russell
parent 177e449dc5
commit 0c78441cf4
3 changed files with 4 additions and 3 deletions
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2
drivers/lguest/lg.h
View file

@ -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);

3
drivers/lguest/page_tables.c
View file

@ -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;

2
drivers/lguest/x86/core.c
View file

@ -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). */