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Commit ce949717 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

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

arch/x86/lguest/boot.c

+10 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ 
#include <asm/i387.h>

#include <asm/stackprotector.h>

#include <asm/reboot.h>		/* for struct machine_ops */

#include <asm/kvm_para.h>



/*G:010

 * Welcome to the Guest!
@@ -455,6 +456,15 @@ static void lguest_cpuid(unsigned int *ax, unsigned int *bx, 
		*ax &= 0xFFFFF0FF;

		*ax |= 0x00000500;

		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

	 * like we do above by limiting it to known fields.

drivers/lguest/core.c

+8 −8
Original line number Diff line number Diff line
@@ -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 */

		if (signal_pending(current))

			return -ERESTARTSYS;
@@ -245,13 +252,6 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user) 
		if (irq < LGUEST_IRQS)

			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

		 * those hypercalls could have been fatal, for example.
@@ -313,7 +313,7 @@ static int __init init(void) 
	int err;



	/* 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");

		return -EPERM;

	}