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). */
- 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)
- copy_traps(lg, pages->state.guest_idt, default_idt_entries);
+ copy_traps(cpu, pages->state.guest_idt, default_idt_entries);
/* Copy all GDT entries which the Guest can change. */
if (lg->changed & CHANGED_GDT)
- copy_gdt(lg, pages->state.guest_gdt);
+ copy_gdt(cpu, pages->state.guest_gdt);
/* If only the TLS entries have changed, copy them. */
else if (lg->changed & CHANGED_GDT_TLS)
- copy_gdt_tls(lg, pages->state.guest_gdt);
+ copy_gdt_tls(cpu, pages->state.guest_gdt);
/* Mark the Guest as unchanged for next time. */
lg->changed = 0;
/* Set the trap number to 256 (impossible value). If we fault while
* switching to the Guest (bad segment registers or bug), this will
* cause us to abort the Guest. */
- lg->regs->trapnum = 256;
+ cpu->regs->trapnum = 256;
/* Now: we push the "eflags" register on the stack, then do an "lcall".
* This is how we change from using the kernel code segment to using
* 0-th argument above, ie "a"). %ebx contains the
* physical address of the Guest's top-level page
* directory. */
- : "0"(pages), "1"(__pa(lg->pgdirs[lg->pgdidx].pgdir))
+ : "0"(pages), "1"(__pa(lg->pgdirs[cpu->cpu_pgd].pgdir))
/* We tell gcc that all these registers could change,
* which means we don't have to save and restore them in
* the Switcher. */
* 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
* bad virtual address. We have to grab this now, because once we
* re-enable interrupts an interrupt could fault and thus overwrite
* cr2, or we could even move off to a different CPU. */
- if (lg->regs->trapnum == 14)
- lg->arch.last_pagefault = read_cr2();
+ if (cpu->regs->trapnum == 14)
+ cpu->arch.last_pagefault = read_cr2();
/* Similarly, if we took a trap because the Guest used the FPU,
* we have to restore the FPU it expects to see. */
- else if (lg->regs->trapnum == 7)
+ else if (cpu->regs->trapnum == 7)
math_state_restore();
/* Restore SYSENTER if it's supposed to be on. */
* When the Guest uses one of these instructions, we get a trap (General
* Protection Fault) and come here. We see if it's one of those troublesome
* instructions and skip over it. We return true if we did. */
-static int emulate_insn(struct lguest *lg)
+static int emulate_insn(struct lg_cpu *cpu)
{
+ struct lguest *lg = cpu->lg;
u8 insn;
unsigned int insnlen = 0, in = 0, shift = 0;
/* The eip contains the *virtual* address of the Guest's instruction:
* guest_pa just subtracts the Guest's page_offset. */
- unsigned long physaddr = guest_pa(lg, lg->regs->eip);
+ unsigned long physaddr = guest_pa(cpu, cpu->regs->eip);
/* This must be the Guest kernel trying to do something, not userspace!
* The bottom two bits of the CS segment register are the privilege
* level. */
- if ((lg->regs->cs & 3) != GUEST_PL)
+ if ((cpu->regs->cs & 3) != GUEST_PL)
return 0;
/* Decoding x86 instructions is icky. */
if (in) {
/* Lower bit tells is whether it's a 16 or 32 bit access */
if (insn & 0x1)
- lg->regs->eax = 0xFFFFFFFF;
+ cpu->regs->eax = 0xFFFFFFFF;
else
- lg->regs->eax |= (0xFFFF << shift);
+ cpu->regs->eax |= (0xFFFF << shift);
}
/* Finally, we've "done" the instruction, so move past it. */
- lg->regs->eip += insnlen;
+ cpu->regs->eip += insnlen;
/* Success! */
return 1;
}
void lguest_arch_handle_trap(struct lg_cpu *cpu)
{
struct lguest *lg = cpu->lg;
- switch (lg->regs->trapnum) {
+ switch (cpu->regs->trapnum) {
case 13: /* We've intercepted a General Protection Fault. */
/* Check if this was one of those annoying IN or OUT
* instructions which we need to emulate. If so, we just go
* back into the Guest after we've done it. */
- if (lg->regs->errcode == 0) {
- if (emulate_insn(lg))
+ if (cpu->regs->errcode == 0) {
+ if (emulate_insn(cpu))
return;
}
break;
*
* The errcode tells whether this was a read or a write, and
* whether kernel or userspace code. */
- if (demand_page(lg, lg->arch.last_pagefault, lg->regs->errcode))
+ if (demand_page(cpu, cpu->arch.last_pagefault,
+ cpu->regs->errcode))
return;
/* OK, it's really not there (or not OK): the Guest needs to
* happen before it's done the LHCALL_LGUEST_INIT hypercall, so
* lg->lguest_data could be NULL */
if (lg->lguest_data &&
- put_user(lg->arch.last_pagefault, &lg->lguest_data->cr2))
+ put_user(cpu->arch.last_pagefault, &lg->lguest_data->cr2))
kill_guest(lg, "Writing cr2");
break;
case 7: /* We've intercepted a Device Not Available fault. */
/* 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:
case LGUEST_TRAP_ENTRY:
/* Our 'struct hcall_args' maps directly over our regs: we set
* up the pointer now to indicate a hypercall is pending. */
- cpu->hcall = (struct hcall_args *)lg->regs;
+ cpu->hcall = (struct hcall_args *)cpu->regs;
return;
}
/* We didn't handle the trap, so it needs to go to the Guest. */
- if (!deliver_trap(lg, lg->regs->trapnum))
+ if (!deliver_trap(cpu, cpu->regs->trapnum))
/* If the Guest doesn't have a handler (either it hasn't
* registered any yet, or it's one of the faults we don't let
* it handle), it dies with a cryptic error message. */
kill_guest(lg, "unhandled trap %li at %#lx (%#lx)",
- lg->regs->trapnum, lg->regs->eip,
- lg->regs->trapnum == 14 ? lg->arch.last_pagefault
- : lg->regs->errcode);
+ cpu->regs->trapnum, cpu->regs->eip,
+ cpu->regs->trapnum == 14 ? cpu->arch.last_pagefault
+ : cpu->regs->errcode);
}
/* Now we can look at each of the routines this calls, in increasing order of
/*H:122 The i386-specific hypercalls simply farm out to the right functions. */
int lguest_arch_do_hcall(struct lg_cpu *cpu, struct hcall_args *args)
{
- struct lguest *lg = cpu->lg;
-
switch (args->arg0) {
case LHCALL_LOAD_GDT:
- load_guest_gdt(lg, args->arg1, args->arg2);
+ load_guest_gdt(cpu, args->arg1, args->arg2);
break;
case LHCALL_LOAD_IDT_ENTRY:
- load_guest_idt_entry(lg, args->arg1, args->arg2, args->arg3);
+ load_guest_idt_entry(cpu, args->arg1, args->arg2, args->arg3);
break;
case LHCALL_LOAD_TLS:
- guest_load_tls(lg, args->arg1);
+ guest_load_tls(cpu, args->arg1);
break;
default:
/* Bad Guest. Bad! */
*
* Most of the Guest's registers are left alone: we used get_zeroed_page() to
* allocate the structure, so they will be 0. */
-void lguest_arch_setup_regs(struct lguest *lg, unsigned long start)
+void lguest_arch_setup_regs(struct lg_cpu *cpu, unsigned long start)
{
- struct lguest_regs *regs = lg->regs;
+ struct lguest_regs *regs = cpu->regs;
/* There are four "segment" registers which the Guest needs to boot:
* The "code segment" register (cs) refers to the kernel code segment
/* There are a couple of GDT entries the Guest expects when first
* booting. */
- setup_guest_gdt(lg);
+ setup_guest_gdt(cpu);
}
projects / karo-tx-linux.git / blobdiff