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[PATCH 20/20] KVM: Use CPU_DYING for disabling virtualization

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From: Avi Kivity <avi@...>
To: <kvm-devel@...>
Cc: <linux-kernel@...>, Avi Kivity <avi@...>
Subject: [PATCH 20/20] KVM: Use CPU_DYING for disabling virtualization
Date: Sunday, July 8, 2007 - 7:54 am

Only at the CPU_DYING stage can we be sure that no user process will
be scheduled onto the cpu and oops when trying to use virtualization
extensions.

Signed-off-by: Avi Kivity <avi@qumranet.com>
---
 drivers/kvm/kvm_main.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 54cad51..83bb284 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -3004,8 +3004,8 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
 	int cpu = (long)v;
 
 	switch (val) {
-	case CPU_DOWN_PREPARE:
-	case CPU_DOWN_PREPARE_FROZEN:
+	case CPU_DYING:
+	case CPU_DYING_FROZEN:
 	case CPU_UP_CANCELED:
 	case CPU_UP_CANCELED_FROZEN:
 		printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
-- 
1.5.2.2

-
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Messages in current thread:
[PATCH 00/20] KVM updates for 2.6.23, part 2, Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 16/20] HOTPLUG: Adapt thermal throttle to CPU_DYING, Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 13/20] KVM: Clean up #includes, Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 20/20] KVM: Use CPU_DYING for disabling virtualization, Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 19/20] KVM: Tune hotplug/suspend IPIs, Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 17/20] SMP: Implement on_cpu(), Avi Kivity, (Sun Jul 8, 7:54 am)
Re: [PATCH 17/20] SMP: Implement on_cpu(), Andi Kleen, (Sun Jul 8, 3:06 pm)
Re: [PATCH 17/20] SMP: Implement on_cpu(), Avi Kivity, (Mon Jul 9, 2:46 am)
Re: [PATCH 17/20] SMP: Implement on_cpu(), Andi Kleen, (Mon Jul 9, 3:16 am)
Re: [PATCH 17/20] SMP: Implement on_cpu(), Avi Kivity, (Mon Jul 9, 5:40 am)
Re: [PATCH 17/20] SMP: Implement on_cpu(), Avi Kivity, (Mon Jul 9, 7:28 am)
Re: [PATCH 17/20] SMP: Implement on_cpu(), Satyam Sharma, (Mon Jul 9, 3:24 pm)
Re: [PATCH 17/20] SMP: Implement on_cpu(), Avi Kivity, (Tue Jul 10, 2:03 am)
Re: [PATCH 17/20] SMP: Implement on_cpu(), Satyam Sharma, (Tue Jul 10, 5:22 am)
Re: [PATCH 17/20] SMP: Implement on_cpu(), Avi Kivity, (Tue Jul 10, 7:03 am)
Re: [PATCH 17/20] SMP: Implement on_cpu(), Satyam Sharma, (Tue Jul 10, 8:07 pm)
Re: [PATCH 17/20] SMP: Implement on_cpu(), Avi Kivity, (Wed Jul 11, 3:26 am)
gcc + kvm + 64 bit ? confused :-/, Benjamin Budts, (Wed Jul 11, 5:43 am)
Re: gcc + kvm + 64 bit ? confused :-/, Andi Kleen, (Wed Jul 11, 6:54 am)
Re: [PATCH 17/20] SMP: Implement on_cpu(), Satyam Sharma, (Wed Jul 11, 3:47 am)
[PATCH 09/20] KVM: MMU: Fix Wrong tlb flush order, Avi Kivity, (Sun Jul 8, 7:54 am)
Re: [PATCH 09/20] KVM: MMU: Fix Wrong tlb flush order, Ingo Molnar, (Sun Jul 8, 8:21 am)
Re: [PATCH 09/20] KVM: MMU: Fix Wrong tlb flush order, Avi Kivity, (Sun Jul 8, 8:42 am)
[PATCH 18/20] KVM: Keep track of which cpus have virtualizat..., Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 12/20] KVM: Remove kvmfs in favor of the anonymous in..., Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 10/20] KVM: VMX: Remove unnecessary code in vmx_tlb_f..., Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 05/20] KVM: Add support for in-kernel pio handlers, Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 14/20] HOTPLUG: Add CPU_DYING notifier, Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 15/20] HOTPLUG: Adapt cpuset hotplug callback to CPU_..., Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 11/20] KVM: SVM: Reliably detect if SVM was disabled ..., Avi Kivity, (Sun Jul 8, 7:54 am)
Re: [PATCH 11/20] KVM: SVM: Reliably detect if SVM was disab..., Roland Dreier, (Sun Jul 8, 9:43 am)
Re: [PATCH 11/20] KVM: SVM: Reliably detect if SVM was disab..., Avi Kivity, (Sun Jul 8, 9:45 am)
[PATCH 06/20] KVM: Fix x86 emulator writeback, Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 08/20] KVM: VMX: Reinitialize the real-mode tss when ..., Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 07/20] KVM: Avoid useless memory write when possible, Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 03/20] KVM: Adds support for in-kernel mmio handlers, Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 02/20] KVM: Implement emulation of instruction "ret" ..., Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 01/20] KVM: Implement emulation of "pop reg" instruct..., Avi Kivity, (Sun Jul 8, 7:54 am)
[PATCH 04/20] KVM: VMX: Fix interrupt checking on lightweigh..., Avi Kivity, (Sun Jul 8, 7:54 am)