diff options
| author | Sean Christopherson <seanjc@google.com> | 2022-11-30 23:36:50 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-11 16:31:50 +0100 |
| commit | 5337bbff9899e2cdcba76e758ee57799bd5beef2 (patch) | |
| tree | 8fb1c66c90905873ef53821c63417f13dc7d35f3 /kernel | |
| parent | c10d6163b78dabde922f226121ac98cf44c2de5a (diff) | |
x86/reboot: Disable SVM, not just VMX, when stopping CPUs
commit a2b07fa7b93321c059af0c6d492cc9a4f1e390aa upstream.
Disable SVM and more importantly force GIF=1 when halting a CPU or
rebooting the machine. Similar to VMX, SVM allows software to block
INITs via CLGI, and thus can be problematic for a crash/reboot. The
window for failure is smaller with SVM as INIT is only blocked while
GIF=0, i.e. between CLGI and STGI, but the window does exist.
Fixes: fba4f472b33a ("x86/reboot: Turn off KVM when halting a CPU")
Cc: stable@vger.kernel.org
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20221130233650.1404148-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions