[PATCH v3 17/18] KVM: x86: Force kvm_rebooting=true during emergency reboot/crash

Sean Christopherson
2023-05-12T23:52:38Z

Set kvm_rebooting when virtualization is disabled in an emergency so that
KVM eats faults on virtualization instructions even if kvm_reboot() isn't
reached.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/svm/svm.c | 2 ++
arch/x86/kvm/vmx/vmx.c | 2 ++
2 files changed, 4 insertions(+)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 2cc195d95d32..d00da133b14f 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -611,6 +611,8 @@ static inline void kvm_cpu_svm_disable(void)

static void svm_emergency_disable(void)
{
+ kvm_rebooting = true;
+
kvm_cpu_svm_disable();
}

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 008914396180..1dec932aff21 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -771,6 +771,8 @@ static void vmx_emergency_disable(void)
int cpu = raw_smp_processor_id();
struct loaded_vmcs *v;

+ kvm_rebooting = true;
+
list_for_each_entry(v, &per_cpu(loaded_vmcss_on_cpu, cpu),
loaded_vmcss_on_cpu_link)
vmcs_clear(v->vmcs);
--
2.40.1.606.ga4b1b128d6-goog