diff options
| author | Sean Christopherson <seanjc@google.com> | 2020-12-30 16:26:55 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-03 16:44:22 +0100 |
| commit | a6d4fc8c4ff0d9ed253fbd96b30962c619da36ef (patch) | |
| tree | 802efc56b15d2bee3abc542576b10fff9eaa01ff /mm/hugetlb.c | |
| parent | 4a7bf4f5a55e5acfce12fb02303256db4f777d36 (diff) | |
x86/reboot: Force all cpus to exit VMX root if VMX is supported
commit ed72736183c45a413a8d6974dd04be90f514cb6b upstream.
Force all CPUs to do VMXOFF (via NMI shootdown) during an emergency
reboot if VMX is _supported_, as VMX being off on the current CPU does
not prevent other CPUs from being in VMX root (post-VMXON). This fixes
a bug where a crash/panic reboot could leave other CPUs in VMX root and
prevent them from being woken via INIT-SIPI-SIPI in the new kernel.
Fixes: d176720d34c7 ("x86: disable VMX on all CPUs on reboot")
Cc: stable@vger.kernel.org
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: David P. Reed <dpreed@deepplum.com>
[sean: reworked changelog and further tweaked comment]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20201231002702.2223707-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/hugetlb.c')
0 files changed, 0 insertions, 0 deletions