UBUNTU: SAUCE: [Fix] x86/KVM/VMX: Add L1D flush logic

BugLink: https://bugs.launchpad.net/bugs/1811646

Enable L1D flushing for AMD which was missed in the backport of
c595ceee ("x86/KVM/VMX: Add L1D flush logic").

Fixes: 57880666 ("x86/KVM/VMX: Add L1D flush logic")
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

arch/x86/kvm/svm.c

@@ -1681,6 +1681,8 @@ static int pf_interception(struct vcpu_svm *svm)
 	u32 error_code;
 	int r = 1;
 
+	svm->vcpu.arch.l1tf_flush_l1d = true;
+
 	switch (svm->apf_reason) {
 	default:
 		error_code = svm->vmcb->control.exit_info_1;