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KVM: x86: Move kvm_rebooting to x86

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Move kvm_rebooting, which is only read by x86, to KVM x86 so that it can
be moved again to core x86 code.  Add a "shutdown" arch hook to facilate
setting the flag in KVM x86, along with a pile of comments to provide more
context around what KVM x86 is doing and why.

Reviewed-by: Chao Gao <chao.gao@intel.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Tested-by: Chao Gao <chao.gao@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Sagi Shahar <sagis@google.com>
Link: https://patch.msgid.link/20260214012702.2368778-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2026-02-13 17:26:47 -08:00
commit 4059172b2a
4 changed files with 37 additions and 8 deletions
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14
virt/kvm/kvm_main.c
View file

@ -5578,13 +5578,15 @@ bool enable_virt_at_load = true;
module_param(enable_virt_at_load, bool, 0444);
EXPORT_SYMBOL_FOR_KVM_INTERNAL(enable_virt_at_load);
__visible bool kvm_rebooting;
EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_rebooting);
static DEFINE_PER_CPU(bool, virtualization_enabled);
static DEFINE_MUTEX(kvm_usage_lock);
static int kvm_usage_count;
__weak void kvm_arch_shutdown(void)
{
}
__weak void kvm_arch_enable_virtualization(void)
{
@ -5638,10 +5640,9 @@ static int kvm_offline_cpu(unsigned int cpu)
static void kvm_shutdown(void *data)
{
kvm_arch_shutdown();
/*
* Disable hardware virtualization and set kvm_rebooting to indicate
* that KVM has asynchronously disabled hardware virtualization, i.e.
* that relevant errors and exceptions aren't entirely unexpected.
* Some flavors of hardware virtualization need to be disabled before
* transferring control to firmware (to perform shutdown/reboot), e.g.
* on x86, virtualization can block INIT interrupts, which are used by
@ -5650,7 +5651,6 @@ static void kvm_shutdown(void *data)
* 100% comprehensive.
*/
pr_info("kvm: exiting hardware virtualization\n");
kvm_rebooting = true;
on_each_cpu(kvm_disable_virtualization_cpu, NULL, 1);
}