4 files changed, 63 insertions, 2 deletions

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 4143d9b0d87a..9737e97f9f38 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -270,6 +270,8 @@ source "drivers/Kconfig"
 
 source "fs/Kconfig"
 
+source "arch/arm64/kvm/Kconfig"
+
 source "arch/arm64/Kconfig.debug"
 
 source "security/Kconfig"
diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
index 49c162c03b69..666e231d410b 100644
--- a/arch/arm64/kernel/asm-offsets.c
+++ b/arch/arm64/kernel/asm-offsets.c
@@ -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>
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
new file mode 100644
index 000000000000..21e90820bd23
--- /dev/null
+++ b/arch/arm64/kvm/Kconfig
@@ -0,0 +1,51 @@
+#
+# 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
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a7e18551c968..064d0be67ecc 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -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)