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lguest: make registers per-vcpu

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This is the most obvious per-vcpu field: registers.

So this patch moves it from struct lguest to struct vcpu,
and patch the places in which they are used, accordingly

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 11:05:32 -02:00
committed by Rusty Russell
parent a3863f68b0
commit a53a35a8b4
5 changed files with 60 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/lguest/x86/core.c
View File

@ -127,7 +127,7 @@ static void run_guest_once(struct lg_cpu *cpu, struct lguest_pages *pages)
/* 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
@ -195,11 +195,11 @@ void lguest_arch_run_guest(struct lg_cpu *cpu)
* 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)
if (cpu->regs->trapnum == 14)
lg->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. */
@ -225,12 +225,12 @@ static int emulate_insn(struct lg_cpu *cpu)
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(lg, 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. */
@ -273,12 +273,12 @@ static int emulate_insn(struct lg_cpu *cpu)
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;
}
@ -287,12 +287,12 @@ static int emulate_insn(struct lg_cpu *cpu)
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 (cpu->regs->errcode == 0) {
if (emulate_insn(cpu))
return;
}
@ -307,7 +307,7 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu)
*
* 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(lg, lg->arch.last_pagefault, cpu->regs->errcode))
return;
/* OK, it's really not there (or not OK): the Guest needs to
@ -338,19 +338,19 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu)
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(cpu, 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 ? lg->arch.last_pagefault
: cpu->regs->errcode);
}
/* Now we can look at each of the routines this calls, in increasing order of
@ -557,9 +557,9 @@ int lguest_arch_init_hypercalls(struct lg_cpu *cpu)
*
* 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
@ -586,5 +586,5 @@ void lguest_arch_setup_regs(struct lguest *lg, unsigned long start)
/* There are a couple of GDT entries the Guest expects when first
* booting. */
setup_guest_gdt(lg);
setup_guest_gdt(cpu->lg);
}