From: Adalbert Lazar <alazar@xxxxxxxxxxxxxxx>
This is used to validate the KVMI_GET_PAGE_ACCESS and KVMI_SET_PAGE_ACCESS
commands when the guest introspection tool selects a different EPT view.
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/vmx.c | 2 ++
arch/x86/kvm/x86.c | 3 +++
3 files changed, 6 insertions(+)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 239eb628f8fb..2cf03ed181e6 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1162,6 +1162,7 @@ extern u64 kvm_max_tsc_scaling_ratio;
extern u64 kvm_default_tsc_scaling_ratio;
extern u64 kvm_mce_cap_supported;
+extern bool kvm_eptp_switching_supported;
enum emulation_result {
EMULATE_DONE, /* no further processing */
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 5487e0242030..093a2e1f7ea6 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6898,6 +6898,8 @@ static __init int hardware_setup(void)
kvm_x86_ops->cancel_hv_timer = NULL;
}
+ kvm_eptp_switching_supported = cpu_has_vmx_vmfunc();
+
kvm_set_posted_intr_wakeup_handler(wakeup_handler);
kvm_mce_cap_supported |= MCG_LMCE_P;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4b0c3692386d..e7db70ac1f82 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -138,6 +138,9 @@ module_param(lapic_timer_advance_ns, uint, S_IRUGO | S_IWUSR);
static bool __read_mostly vector_hashing = true;
module_param(vector_hashing, bool, S_IRUGO);
+bool __read_mostly kvm_eptp_switching_supported;
+EXPORT_SYMBOL_GPL(kvm_eptp_switching_supported);
+
#define KVM_NR_SHARED_MSRS 16
struct kvm_shared_msrs_global {
