linux-kernel - [patch v12 10/13] KVM: x86: process isolation work from VM-entry code path

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Date:   Tue, 15 Mar 2022 12:31:42 -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>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Oscar Shiang <oscar0225@...email.tw>,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: [patch v12 10/13] KVM: x86: process isolation work 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 before VM-enter.

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

---
v12
- Add missing kvm-entry.h change			(Frederic)

v11
- Add TIF_TASK_ISOL bit to thread info flags and use it
  to decide whether to perform task isolation work on
  return to userspace                                   (Frederic W. Weisbecker)

 include/linux/entry-kvm.h |    4 +++-
 kernel/entry/kvm.c        |   18 ++++++++++++++----
 2 files changed, 17 insertions(+), 5 deletions(-)

Index: linux-2.6/kernel/entry/kvm.c
===================================================================
--- linux-2.6.orig/kernel/entry/kvm.c
+++ linux-2.6/kernel/entry/kvm.c
@@ -2,6 +2,7 @@
 
 #include <linux/entry-kvm.h>
 #include <linux/kvm_host.h>
+#include <linux/task_isolation.h>
 
 static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu, unsigned long ti_work)
 {
@@ -22,6 +23,9 @@ static int xfer_to_guest_mode_work(struc
 		if (ti_work & _TIF_NOTIFY_RESUME)
 			tracehook_notify_resume(NULL);
 
+		if (ti_work & _TIF_TASK_ISOL)
+			task_isol_exit_to_user_mode();
+
 		ret = arch_xfer_to_guest_mode_handle_work(vcpu, ti_work);
 		if (ret)
 			return ret;
Index: linux-2.6/include/linux/entry-kvm.h
===================================================================
--- linux-2.6.orig/include/linux/entry-kvm.h
+++ linux-2.6/include/linux/entry-kvm.h
@@ -18,7 +18,7 @@
 
 #define XFER_TO_GUEST_MODE_WORK						\
 	(_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL |	\
-	 _TIF_NOTIFY_RESUME | ARCH_XFER_TO_GUEST_MODE_WORK)
+	 _TIF_NOTIFY_RESUME | _TIF_TASK_ISOL | ARCH_XFER_TO_GUEST_MODE_WORK)
 
 struct kvm_vcpu;