Messages in this thread Patch in this message | | | Date | Mon, 7 Feb 2022 16:47:07 +0100 | From | Frederic Weisbecker <> | Subject | Re: [patch v11 10/13] KVM: x86: process isolation work from VM-entry code path |
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On Fri, Feb 04, 2022 at 02:35:47PM -0300, Marcelo Tosatti wrote: > 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@redhat.com> > > --- > 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; > >
Do you need this?
diff --git a/include/linux/entry-kvm.h b/include/linux/entry-kvm.h index 07c878d6e323..3588d6071caf 100644 --- a/include/linux/entry-kvm.h +++ b/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;
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