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lguest: per-cpu run guest

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This patch makes the run_guest() routine use the lg_cpu struct.
This is required since in a smp guest environment, there's no
more the notion of "running the guest", but rather, it is "running the vcpu"

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 11:05:25 -02:00
committed by Rusty Russell
parent 4dcc53da49
commit d0953d42c3
4 changed files with 25 additions and 11 deletions
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14
drivers/lguest/x86/core.c
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@ -73,8 +73,9 @@ static DEFINE_PER_CPU(struct lguest *, last_guest);
* since it last ran. We saw this set in interrupts_and_traps.c and
* segments.c.
*/
static void copy_in_guest_info(struct lguest *lg, struct lguest_pages *pages)
static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages)
{
struct lguest *lg = cpu->lg;
/* Copying all this data can be quite expensive. We usually run the
* same Guest we ran last time (and that Guest hasn't run anywhere else
* meanwhile). If that's not the case, we pretend everything in the
@ -113,14 +114,15 @@ static void copy_in_guest_info(struct lguest *lg, struct lguest_pages *pages)
}
/* Finally: the code to actually call into the Switcher to run the Guest. */
static void run_guest_once(struct lguest *lg, struct lguest_pages *pages)
static void run_guest_once(struct lg_cpu *cpu, struct lguest_pages *pages)
{
/* This is a dummy value we need for GCC's sake. */
unsigned int clobber;
struct lguest *lg = cpu->lg;
/* Copy the guest-specific information into this CPU's "struct
* lguest_pages". */
copy_in_guest_info(lg, pages);
copy_in_guest_info(cpu, pages);
/* Set the trap number to 256 (impossible value). If we fault while
* switching to the Guest (bad segment registers or bug), this will
@ -161,8 +163,10 @@ static void run_guest_once(struct lguest *lg, struct lguest_pages *pages)
/*H:040 This is the i386-specific code to setup and run the Guest. Interrupts
* are disabled: we own the CPU. */
void lguest_arch_run_guest(struct lguest *lg)
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. */
@ -180,7 +184,7 @@ void lguest_arch_run_guest(struct lguest *lg)
/* Now we actually run the Guest. It will return when something
* interesting happens, and we can examine its registers to see what it
* was doing. */
run_guest_once(lg, lguest_pages(raw_smp_processor_id()));
run_guest_once(cpu, lguest_pages(raw_smp_processor_id()));
/* Note that the "regs" pointer contains two extra entries which are
* not really registers: a trap number which says what interrupt or