Commit 64fb6d9a authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'kvm-3.11-2' of git://git.kernel.org/pub/scm/virt/kvm/kvm 

Pull more KVM changes from Gleb Natapov:
 "A fix for a bug that prevents some guests from working on old Intel
  CPUs and a patch that integrates ARM64 KVM, merged via ARM64 tree,
  into Kconfig."

* tag 'kvm-3.11-2' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: VMX: mark unusable segment as nonpresent
  arm64: KVM: Kconfig integration
parents b4294eec 03617c18

arch/arm64/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -270,6 +270,8 @@ source "drivers/Kconfig" 


source "fs/Kconfig"



source "arch/arm64/kvm/Kconfig"



source "arch/arm64/Kconfig.debug"



source "security/Kconfig"

arch/arm64/kernel/asm-offsets.c

+1 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#include <linux/sched.h>

#include <linux/mm.h>

#include <linux/dma-mapping.h>

#include <linux/kvm_host.h>

#include <asm/thread_info.h>

#include <asm/memory.h>

#include <asm/cputable.h>

arch/arm64/kvm/Kconfig

0 → 100644
+51 −0
Original line number Diff line number Diff line 
#

# KVM configuration

#



source "virt/kvm/Kconfig"



menuconfig VIRTUALIZATION

	bool "Virtualization"

	---help---

	  Say Y here to get to see options for using your Linux host to run

	  other operating systems inside virtual machines (guests).

	  This option alone does not add any kernel code.



	  If you say N, all options in this submenu will be skipped and

	  disabled.



if VIRTUALIZATION



config KVM

	bool "Kernel-based Virtual Machine (KVM) support"

	select MMU_NOTIFIER

	select PREEMPT_NOTIFIERS

	select ANON_INODES

	select KVM_MMIO

	select KVM_ARM_HOST

	select KVM_ARM_VGIC

	select KVM_ARM_TIMER

	---help---

	  Support hosting virtualized guest machines.



	  If unsure, say N.



config KVM_ARM_HOST

	bool

	---help---

	  Provides host support for ARM processors.



config KVM_ARM_VGIC

	bool

	depends on KVM_ARM_HOST && OF

	select HAVE_KVM_IRQCHIP

	---help---

	  Adds support for a hardware assisted, in-kernel GIC emulation.



config KVM_ARM_TIMER

	bool

	depends on KVM_ARM_VGIC

	---help---

	  Adds support for the Architected Timers in virtual machines.



endif # VIRTUALIZATION

arch/x86/kvm/vmx.c

+9 −2
Original line number Diff line number Diff line
@@ -3404,15 +3404,22 @@ static void vmx_get_segment(struct kvm_vcpu *vcpu, 
	var->limit = vmx_read_guest_seg_limit(vmx, seg);

	var->selector = vmx_read_guest_seg_selector(vmx, seg);

	ar = vmx_read_guest_seg_ar(vmx, seg);

	var->unusable = (ar >> 16) & 1;

	var->type = ar & 15;

	var->s = (ar >> 4) & 1;

	var->dpl = (ar >> 5) & 3;

	var->present = (ar >> 7) & 1;

	/*

	 * Some userspaces do not preserve unusable property. Since usable

	 * segment has to be present according to VMX spec we can use present

	 * property to amend userspace bug by making unusable segment always

	 * nonpresent. vmx_segment_access_rights() already marks nonpresent

	 * segment as unusable.

	 */

	var->present = !var->unusable;

	var->avl = (ar >> 12) & 1;

	var->l = (ar >> 13) & 1;

	var->db = (ar >> 14) & 1;

	var->g = (ar >> 15) & 1;

	var->unusable = (ar >> 16) & 1;

}



static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)

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