Commit ce949717 authored by Linus Torvalds's avatar Linus Torvalds

Merge git://github.com/rustyrussell/linux

* git://github.com/rustyrussell/linux:
  lguest: move process freezing before pending signals check
  lguest: don't allow KVM-detection cpuid.
  lguest: Allow running under paravirt-enabled KVM.
parents 24984247 0acf0001
...@@ -70,6 +70,7 @@ ...@@ -70,6 +70,7 @@
#include <asm/i387.h> #include <asm/i387.h>
#include <asm/stackprotector.h> #include <asm/stackprotector.h>
#include <asm/reboot.h> /* for struct machine_ops */ #include <asm/reboot.h> /* for struct machine_ops */
#include <asm/kvm_para.h>
/*G:010 /*G:010
* Welcome to the Guest! * Welcome to the Guest!
...@@ -455,6 +456,15 @@ static void lguest_cpuid(unsigned int *ax, unsigned int *bx, ...@@ -455,6 +456,15 @@ static void lguest_cpuid(unsigned int *ax, unsigned int *bx,
*ax &= 0xFFFFF0FF; *ax &= 0xFFFFF0FF;
*ax |= 0x00000500; *ax |= 0x00000500;
break; break;
/*
* This is used to detect if we're running under KVM. We might be,
* but that's a Host matter, not us. So say we're not.
*/
case KVM_CPUID_SIGNATURE:
*bx = *cx = *dx = 0;
break;
/* /*
* 0x80000000 returns the highest Extended Function, so we futureproof * 0x80000000 returns the highest Extended Function, so we futureproof
* like we do above by limiting it to known fields. * like we do above by limiting it to known fields.
......
...@@ -232,6 +232,13 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user) ...@@ -232,6 +232,13 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user)
} }
} }
/*
* All long-lived kernel loops need to check with this horrible
* thing called the freezer. If the Host is trying to suspend,
* it stops us.
*/
try_to_freeze();
/* Check for signals */ /* Check for signals */
if (signal_pending(current)) if (signal_pending(current))
return -ERESTARTSYS; return -ERESTARTSYS;
...@@ -245,13 +252,6 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user) ...@@ -245,13 +252,6 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user)
if (irq < LGUEST_IRQS) if (irq < LGUEST_IRQS)
try_deliver_interrupt(cpu, irq, more); try_deliver_interrupt(cpu, irq, more);
/*
* All long-lived kernel loops need to check with this horrible
* thing called the freezer. If the Host is trying to suspend,
* it stops us.
*/
try_to_freeze();
/* /*
* Just make absolutely sure the Guest is still alive. One of * Just make absolutely sure the Guest is still alive. One of
* those hypercalls could have been fatal, for example. * those hypercalls could have been fatal, for example.
...@@ -313,7 +313,7 @@ static int __init init(void) ...@@ -313,7 +313,7 @@ static int __init init(void)
int err; int err;
/* Lguest can't run under Xen, VMI or itself. It does Tricky Stuff. */ /* Lguest can't run under Xen, VMI or itself. It does Tricky Stuff. */
if (paravirt_enabled()) { if (get_kernel_rpl() != 0) {
printk("lguest is afraid of being a guest\n"); printk("lguest is afraid of being a guest\n");
return -EPERM; return -EPERM;
} }
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment