Description: KVM: x86: work around leak of uninitialized stack contents
References:
 https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=353c0956a618a07ba4bbe7ad00ff29fe70e8412a
 https://bugzilla.redhat.com/show_bug.cgi?id=1671930
 https://bugs.chromium.org/p/project-zero/issues/detail?id=1759
Notes:
Bugs:
upstream: released (5.0-rc6) [353c0956a618a07ba4bbe7ad00ff29fe70e8412a]
4.19-upstream-stable: released (4.19.21) [5a45d3720b5437515f8c094f1c3d61f6afe211c1]
4.9-upstream-stable: released (4.9.156) [f5c61e4f6b5a1cc66c61eb68334f725031948a7e]
3.16-upstream-stable: released (3.16.64) [234a2dee1b06502face184e241e03582d7946f80]
sid: released (4.19.20-1) [bugfix/x86/KVM-x86-work-around-leak-of-uninitialized-stack-cont.patch]
4.9-stretch-security: released (4.9.161-1)
3.16-jessie-security: released (3.16.64-1)