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authorSean Christopherson <seanjc@google.com>2023-07-21 23:18:47 +0300
committerSean Christopherson <seanjc@google.com>2023-08-04 01:37:14 +0300
commit59765db5fc82726b32876b794667e2c6936a98ab (patch)
treebf4fb5cc3b84afe13f2059fe8468da0ebf425f20 /tools/perf/scripts/python/task-analyzer.py
parentedc8deb087d884bac2f7013f0c23af73042b23a7 (diff)
downloadlinux-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>
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