linux-kernel - Re: [PATCH] KVM: vmx: fix underflow in TSC deadline calculation

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Message-ID: <f3625299-36cb-0259-6a3f-01dbb8527b0c@redhat.com>
Date:	Tue, 28 Jun 2016 22:07:29 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	yunhong jiang <yunhong.jiang@...ux.intel.com>
Cc:	Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Wanpeng Li <wanpeng.li@...mail.com>,
	Radim Krčmář <rkrcmar@...hat.com>,
	Yunhong Jiang <yunhong.jiang@...el.com>
Subject: Re: [PATCH] KVM: vmx: fix underflow in TSC deadline calculation



On 28/06/2016 20:34, yunhong jiang wrote:
> Paolo, thanks for reply.
> 
> Which race window you are talking about? Is it the
> kvm_lapic_switch_to_hv_timer()? If yes, hope we will not forgot it once the
> lapic timer is not pinned anymore in future.

Yes, it's that one.  This is a good point against using
local_irq_save/restore.

Paolo