On Mon, Aug 13, 2018 at 12:57:17PM +0300, Roman Kagan wrote: > commit 63aff65573d73eb8dda4732ad4ef222dd35e4862 upstream. > > VPID for the nested vcpu is allocated at vmx_create_vcpu whenever nested > vmx is turned on with the module parameter. > > However, it's only freed if the L1 guest has executed VMXON which is not > a given. > > As a result, on a system with nested==on every creation+deletion of an > L1 vcpu without running an L2 guest results in leaking one vpid. Since > the total number of vpids is limited to 64k, they can eventually get > exhausted, preventing L2 from starting. > > Delay allocation of the L2 vpid until VMXON emulation, thus matching its > freeing. > > Fixes: 5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 > Cc: sta...@vger.kernel.org > Signed-off-by: Roman Kagan <rka...@virtuozzo.com> > Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> > Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> > > (cherry picked from commit 020a90f653dd02dbbae389da91f510d5f33984dc) ... on stable/linux-4.9.y VZ-Bug: #PSBM-86479
> Signed-off-by: Roman Kagan <rka...@virtuozzo.com> > --- > arch/x86/kvm/vmx.c | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) Roman. _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel
