diff options
author | Sean Christopherson <seanjc@google.com> | 2023-07-21 23:18:47 +0300 |
---|---|---|
committer | Sean Christopherson <seanjc@google.com> | 2023-08-04 01:37:14 +0300 |
commit | 59765db5fc82726b32876b794667e2c6936a98ab (patch) | |
tree | bf4fb5cc3b84afe13f2059fe8468da0ebf425f20 /tools/perf/scripts/python/task-analyzer.py | |
parent | edc8deb087d884bac2f7013f0c23af73042b23a7 (diff) | |
download | linux-59765db5fc82726b32876b794667e2c6936a98ab.tar.xz |
x86/reboot: Disable virtualization during reboot iff callback is registered
Attempt to disable virtualization during an emergency reboot if and only
if there is a registered virt callback, i.e. iff a hypervisor (KVM) is
active. If there's no active hypervisor, then the CPU can't be operating
with VMX or SVM enabled (barring an egregious bug).
Checking for a valid callback instead of simply for SVM or VMX support
can also eliminates spurious NMIs by avoiding the unecessary call to
nmi_shootdown_cpus_on_restart().
Note, IRQs are disabled, which prevents KVM from coming along and
enabling virtualization after the fact.
Reviewed-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/r/20230721201859.2307736-8-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'tools/perf/scripts/python/task-analyzer.py')
0 files changed, 0 insertions, 0 deletions