Return early from vmx_set_virtual_apic_mode() if the processor doesn't
support VIRTUALIZE_APIC_ACCESSES or VIRTUALIZE_X2APIC_MODE, both of
which reside in SECONDARY_VM_EXEC_CONTROL. This eliminates warnings
due to VMWRITEs to SECONDARY_VM_EXEC_CONTROL (VMCS field 401e) failing
on processors without secondary exec controls.
Remove the similar check for TPR shadowing as it is incorported in the
cpu_has_vmx_flexpriority() check and the APIC-related code in
vmx_update_msr_bitmap() is further gated by VIRTUALIZE_X2APIC_MODE.
Reported-by: Gerhard Wiesinger <redhat@xxxxxxxxxxxxx>
Fixes: 8d860bbeedef ("kvm: vmx: Basic APIC virtualization controls have three settings")
Cc: Jim Mattson <jmattson@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
---
arch/x86/kvm/vmx.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e1b8ea9a2bc4..a3c864abf58d 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -10203,15 +10203,16 @@ static void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
if (!lapic_in_kernel(vcpu))
return;
+ if (!cpu_has_vmx_flexpriority() &&
+ !cpu_has_vmx_virtualize_x2apic_mode())
+ return;
+
/* Postpone execution until vmcs01 is the current VMCS. */
if (is_guest_mode(vcpu)) {
to_vmx(vcpu)->nested.change_vmcs01_virtual_apic_mode = true;
return;
}
- if (!cpu_need_tpr_shadow(vcpu))
- return;
-
sec_exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
sec_exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE);
--
2.18.0
