[PATCH 1/2] KVM: KVM-on-hyperv: shorten no-entry section on reenlightenment
From: Paolo Bonzini <pbonzini@redhat.com>
Date: 2021-08-11 10:24:11
Also in:
lkml
Subsystem:
kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
During re-enlightenment, update kvmclock a VM at a time instead of raising KVM_REQ_MASTERCLOCK_UPDATE for all VMs. Because the guests can now run after TSC emulation has been disabled, invalidate their TSC page so that they refer to the reference time counter MSR while the update is in progress. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> --- arch/x86/kvm/x86.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bab8eb3e0a47..284afaa1db86 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c@@ -8111,7 +8111,7 @@ static void kvm_hyperv_tsc_notifier(void) mutex_lock(&kvm_lock); list_for_each_entry(kvm, &vm_list, vm_list) - kvm_make_mclock_inprogress_request(kvm); + kvm_hv_invalidate_tsc_page(kvm); hyperv_stop_tsc_emulation();
@@ -8123,6 +8123,7 @@ static void kvm_hyperv_tsc_notifier(void) list_for_each_entry(kvm, &vm_list, vm_list) { struct kvm_arch *ka = &kvm->arch; + kvm_make_mclock_inprogress_request(kvm); spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags); pvclock_update_vm_gtod_copy(kvm); spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
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2.27.0