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lguest: make pending notifications per-vcpu

Browse source 
this patch makes the pending_notify field, used to control
pending notifications, per-vcpu, instead of per-guest

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 11:05:36 -02:00 committed by Rusty Russell
parent 4665ac8e28
commit 5e232f4f42
4 changed files with 10 additions and 9 deletions
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6
drivers/lguest/core.c
View file

@ -186,10 +186,10 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user)
/* It's possible the Guest did a NOTIFY hypercall to the
* Launcher, in which case we return from the read() now. */
if (lg->pending_notify) {
if (put_user(lg->pending_notify, user))
if (cpu->pending_notify) {
if (put_user(cpu->pending_notify, user))
return -EFAULT;
return sizeof(lg->pending_notify);
return sizeof(cpu->pending_notify);
}
/* Check for signals */

6
drivers/lguest/hypercalls.c
View file

@ -91,7 +91,7 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args)
cpu->halted = 1;
break;
case LHCALL_NOTIFY:
lg->pending_notify = args->arg1;
cpu->pending_notify = args->arg1;
break;
default:
/* It should be an architecture-specific hypercall. */
@ -154,7 +154,7 @@ static void do_async_hcalls(struct lg_cpu *cpu)
/* Stop doing hypercalls if they want to notify the Launcher:
* it needs to service this first. */
if (lg->pending_notify)
if (cpu->pending_notify)
break;
}
}
@ -219,7 +219,7 @@ void do_hypercalls(struct lg_cpu *cpu)
/* If we stopped reading the hypercall ring because the Guest did a
* NOTIFY to the Launcher, we want to return now. Otherwise we do
* the hypercall. */
if (!cpu->lg->pending_notify) {
if (!cpu->pending_notify) {
do_hcall(cpu, cpu->hcall);
/* Tricky point: we reset the hcall pointer to mark the
* hypercall as "done". We use the hcall pointer rather than

3
drivers/lguest/lg.h
View file

@ -51,6 +51,8 @@ struct lg_cpu {
u32 esp1;
u8 ss1;
unsigned long pending_notify; /* pfn from LHCALL_NOTIFY */
/* At end of a page shared mapped over lguest_pages in guest. */
unsigned long regs_page;
struct lguest_regs *regs;
@ -95,7 +97,6 @@ struct lguest
struct pgdir pgdirs[4];
unsigned long noirq_start, noirq_end;
unsigned long pending_notify; /* pfn from LHCALL_NOTIFY */
unsigned int stack_pages;
u32 tsc_khz;

4
drivers/lguest/lguest_user.c
View file

@ -89,8 +89,8 @@ static ssize_t read(struct file *file, char __user *user, size_t size,loff_t*o)
/* If we returned from read() last time because the Guest notified,
* clear the flag. */
if (lg->pending_notify)
lg->pending_notify = 0;
if (cpu->pending_notify)
cpu->pending_notify = 0;
/* Run the Guest until something interesting happens. */
return run_guest(cpu, (unsigned long __user *)user);