linux-kernel - [patch v4 6/8] KVM: x86: call isolation prepare from VM-entry code path

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Date:   Thu, 07 Oct 2021 16:23:52 -0300
From:   Marcelo Tosatti <mtosatti@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Nitesh Lal <nilal@...hat.com>,
        Nicolas Saenz Julienne <nsaenzju@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Alex Belits <abelits@...its.com>, Peter Xu <peterx@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: [patch v4 6/8] KVM: x86: call isolation prepare from VM-entry code path

VM-entry code path is an entry point similar to userspace return
when task isolation is concerned.

Call isolation_exit_to_user_mode_prepare before VM-enter.

Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>

---
 arch/x86/kvm/x86.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6/arch/x86/kvm/x86.c
===================================================================
--- linux-2.6.orig/arch/x86/kvm/x86.c
+++ linux-2.6/arch/x86/kvm/x86.c
@@ -59,6 +59,7 @@
 #include <linux/mem_encrypt.h>
 #include <linux/entry-kvm.h>
 #include <linux/suspend.h>
+#include <linux/task_isolation.h>
 
 #include <trace/events/kvm.h>
 
@@ -9574,6 +9575,8 @@ static int vcpu_enter_guest(struct kvm_v
 		goto cancel_injection;
 	}
 
+	isolation_exit_to_user_mode_prepare();
+
 	preempt_disable();
 
 	static_call(kvm_x86_prepare_guest_switch)(vcpu);