diff options
Diffstat (limited to 'drivers/lguest')
| -rw-r--r-- | drivers/lguest/hypercalls.c | 10 | ||||
| -rw-r--r-- | drivers/lguest/interrupts_and_traps.c | 23 | ||||
| -rw-r--r-- | drivers/lguest/lg.h | 17 | ||||
| -rw-r--r-- | drivers/lguest/page_tables.c | 11 | ||||
| -rw-r--r-- | drivers/lguest/x86/core.c | 10 |
5 files changed, 36 insertions, 35 deletions
diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c index 83323b1cc0b..ab70bbebdf2 100644 --- a/drivers/lguest/hypercalls.c +++ b/drivers/lguest/hypercalls.c @@ -60,7 +60,7 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) /* FLUSH_TLB comes in two flavors, depending on the * argument: */ if (args->arg1) - guest_pagetable_clear_all(lg); + guest_pagetable_clear_all(cpu); else guest_pagetable_flush_user(lg); break; @@ -68,10 +68,10 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) /* All these calls simply pass the arguments through to the right * routines. */ case LHCALL_NEW_PGTABLE: - guest_new_pagetable(lg, args->arg1); + guest_new_pagetable(cpu, args->arg1); break; case LHCALL_SET_STACK: - guest_set_stack(lg, args->arg1, args->arg2, args->arg3); + guest_set_stack(cpu, args->arg1, args->arg2, args->arg3); break; case LHCALL_SET_PTE: guest_set_pte(lg, args->arg1, args->arg2, __pte(args->arg3)); @@ -84,7 +84,7 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) break; case LHCALL_TS: /* This sets the TS flag, as we saw used in run_guest(). */ - lg->ts = args->arg1; + cpu->ts = args->arg1; break; case LHCALL_HALT: /* Similarly, this sets the halted flag for run_guest(). */ @@ -191,7 +191,7 @@ static void initialize(struct lg_cpu *cpu) * first write to a Guest page. This may have caused a copy-on-write * fault, but the old page might be (read-only) in the Guest * pagetable. */ - guest_pagetable_clear_all(lg); + guest_pagetable_clear_all(cpu); } /*H:100 diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 9c1c479e8c6..b87d9d6c36a 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -73,8 +73,8 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) if ((cpu->regs->ss&0x3) != GUEST_PL) { /* The Guest told us their kernel stack with the SET_STACK * hypercall: both the virtual address and the segment */ - virtstack = lg->esp1; - ss = lg->ss1; + virtstack = cpu->esp1; + ss = cpu->ss1; origstack = gstack = guest_pa(lg, virtstack); /* We push the old stack segment and pointer onto the new @@ -311,10 +311,11 @@ static int direct_trap(unsigned int num) * the Guest. * * Which is deeply unfair, because (literally!) it wasn't the Guests' fault. */ -void pin_stack_pages(struct lguest *lg) +void pin_stack_pages(struct lg_cpu *cpu) { unsigned int i; + struct lguest *lg = cpu->lg; /* Depending on the CONFIG_4KSTACKS option, the Guest can have one or * two pages of stack space. */ for (i = 0; i < lg->stack_pages; i++) @@ -322,7 +323,7 @@ void pin_stack_pages(struct lguest *lg) * start of the page after the kernel stack. Subtract one to * get back onto the first stack page, and keep subtracting to * get to the rest of the stack pages. */ - pin_page(lg, lg->esp1 - 1 - i * PAGE_SIZE); + pin_page(lg, cpu->esp1 - 1 - i * PAGE_SIZE); } /* Direct traps also mean that we need to know whenever the Guest wants to use @@ -333,21 +334,21 @@ void pin_stack_pages(struct lguest *lg) * * In Linux each process has its own kernel stack, so this happens a lot: we * change stacks on each context switch. */ -void guest_set_stack(struct lguest *lg, u32 seg, u32 esp, unsigned int pages) +void guest_set_stack(struct lg_cpu *cpu, u32 seg, u32 esp, unsigned int pages) { /* You are not allowed have a stack segment with privilege level 0: bad * Guest! */ if ((seg & 0x3) != GUEST_PL) - kill_guest(lg, "bad stack segment %i", seg); + kill_guest(cpu->lg, "bad stack segment %i", seg); /* We only expect one or two stack pages. */ if (pages > 2) - kill_guest(lg, "bad stack pages %u", pages); + kill_guest(cpu->lg, "bad stack pages %u", pages); /* Save where the stack is, and how many pages */ - lg->ss1 = seg; - lg->esp1 = esp; - lg->stack_pages = pages; + cpu->ss1 = seg; + cpu->esp1 = esp; + cpu->lg->stack_pages = pages; /* Make sure the new stack pages are mapped */ - pin_stack_pages(lg); + pin_stack_pages(cpu); } /* All this reference to mapping stacks leads us neatly into the other complex diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index e7123fa6127..05637648a17 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -46,6 +46,11 @@ struct lg_cpu { struct task_struct *tsk; struct mm_struct *mm; /* == tsk->mm, but that becomes NULL on exit */ + u32 cr2; + int ts; + u32 esp1; + u8 ss1; + /* At end of a page shared mapped over lguest_pages in guest. */ unsigned long regs_page; struct lguest_regs *regs; @@ -80,10 +85,6 @@ struct lguest * memory in the Launcher. */ void __user *mem_base; unsigned long kernel_address; - u32 cr2; - int ts; - u32 esp1; - u8 ss1; /* Bitmap of what has changed: see CHANGED_* above. */ int changed; @@ -141,8 +142,8 @@ void maybe_do_interrupt(struct lg_cpu *cpu); int deliver_trap(struct lg_cpu *cpu, unsigned int num); void load_guest_idt_entry(struct lg_cpu *cpu, unsigned int i, u32 low, u32 hi); -void guest_set_stack(struct lguest *lg, u32 seg, u32 esp, unsigned int pages); -void pin_stack_pages(struct lguest *lg); +void guest_set_stack(struct lg_cpu *cpu, u32 seg, u32 esp, unsigned int pages); +void pin_stack_pages(struct lg_cpu *cpu); void setup_default_idt_entries(struct lguest_ro_state *state, const unsigned long *def); void copy_traps(const struct lg_cpu *cpu, struct desc_struct *idt, @@ -164,9 +165,9 @@ void copy_gdt_tls(const struct lg_cpu *cpu, struct desc_struct *gdt); /* page_tables.c: */ int init_guest_pagetable(struct lguest *lg, unsigned long pgtable); void free_guest_pagetable(struct lguest *lg); -void guest_new_pagetable(struct lguest *lg, unsigned long pgtable); +void guest_new_pagetable(struct lg_cpu *cpu, unsigned long pgtable); void guest_set_pmd(struct lguest *lg, unsigned long gpgdir, u32 i); -void guest_pagetable_clear_all(struct lguest *lg); +void guest_pagetable_clear_all(struct lg_cpu *cpu); void guest_pagetable_flush_user(struct lguest *lg); void guest_set_pte(struct lguest *lg, unsigned long gpgdir, unsigned long vaddr, pte_t val); diff --git a/drivers/lguest/page_tables.c b/drivers/lguest/page_tables.c index f19add46994..e34c81636a8 100644 --- a/drivers/lguest/page_tables.c +++ b/drivers/lguest/page_tables.c @@ -432,9 +432,10 @@ static unsigned int new_pgdir(struct lguest *lg, * Now we've seen all the page table setting and manipulation, let's see what * what happens when the Guest changes page tables (ie. changes the top-level * pgdir). This occurs on almost every context switch. */ -void guest_new_pagetable(struct lguest *lg, unsigned long pgtable) +void guest_new_pagetable(struct lg_cpu *cpu, unsigned long pgtable) { int newpgdir, repin = 0; + struct lguest *lg = cpu->lg; /* Look to see if we have this one already. */ newpgdir = find_pgdir(lg, pgtable); @@ -446,7 +447,7 @@ void guest_new_pagetable(struct lguest *lg, unsigned long pgtable) lg->pgdidx = newpgdir; /* If it was completely blank, we map in the Guest kernel stack */ if (repin) - pin_stack_pages(lg); + pin_stack_pages(cpu); } /*H:470 Finally, a routine which throws away everything: all PGD entries in all @@ -468,11 +469,11 @@ static void release_all_pagetables(struct lguest *lg) * mapping. Since kernel mappings are in every page table, it's easiest to * throw them all away. This traps the Guest in amber for a while as * everything faults back in, but it's rare. */ -void guest_pagetable_clear_all(struct lguest *lg) +void guest_pagetable_clear_all(struct lg_cpu *cpu) { - release_all_pagetables(lg); + release_all_pagetables(cpu->lg); /* We need the Guest kernel stack mapped again. */ - pin_stack_pages(lg); + pin_stack_pages(cpu); } /*:*/ /*M:009 Since we throw away all mappings when a kernel mapping changes, our diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index e989b835886..65f2e380947 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -95,8 +95,8 @@ static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *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). */ - pages->state.guest_tss.esp1 = lg->esp1; - pages->state.guest_tss.ss1 = lg->ss1; + pages->state.guest_tss.esp1 = cpu->esp1; + pages->state.guest_tss.ss1 = cpu->ss1; /* Copy direct-to-Guest trap entries. */ if (lg->changed & CHANGED_IDT) @@ -165,12 +165,10 @@ static void run_guest_once(struct lg_cpu *cpu, struct lguest_pages *pages) * are disabled: we own the CPU. */ void lguest_arch_run_guest(struct lg_cpu *cpu) { - struct lguest *lg = cpu->lg; - /* Remember the awfully-named TS bit? If the Guest has asked to set it * we set it now, so we can trap and pass that trap to the Guest if it * uses the FPU. */ - if (lg->ts) + if (cpu->ts) lguest_set_ts(); /* SYSENTER is an optimized way of doing system calls. We can't allow @@ -325,7 +323,7 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) /* If the Guest doesn't want to know, we already restored the * Floating Point Unit, so we just continue without telling * it. */ - if (!lg->ts) + if (!cpu->ts) return; break; case 32 ... 255: |