Signed-off-by: Gerhard Wiesinger <li...@wiesinger.com>
---
arch/x86/kvm/svm.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2f9ed1f..e0b00fc 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -198,6 +198,10 @@ static bool npt_enabled;
static int npt = true;
module_param(npt, int, S_IRUGO);
+/* allow backward compatibility with e.g. old DOS application */
+static int npt_task_switch_emulation = true;
+module_param(npt_task_switch_emulation, int, S_IRUGO);
+
/* allow nested virtualization in KVM/SVM */
static int nested = true;
module_param(nested, int, S_IRUGO);
@@ -1177,6 +1181,9 @@ static void init_vmcb(struct vcpu_svm *svm, bool
init_event)
if (npt_enabled) {
/* Setup VMCB for Nested Paging */
control->nested_ctl = 1;
+ if (!npt_task_switch_emulation) {
+ clr_intercept(svm, INTERCEPT_TASK_SWITCH);
+ }
clr_intercept(svm, INTERCEPT_INVLPG);
clr_exception_intercept(svm, PF_VECTOR);
clr_cr_intercept(svm, INTERCEPT_CR3_READ);
--
2.4.3
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