linux-kernel - Emulated Guest TLB flush IPIs in qemu-kvm

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Message-ID: <CAHqbYQt4o+sr8s4RVLdsMPMjx-SzTR8ccCuxwYXOoain91=3dQ@mail.gmail.com>
Date:	Thu, 9 Jan 2014 12:05:26 -0500
From:	Hu Yaohui <loki2441@...il.com>
To:	kvm <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	qemu-devel <qemu-devel@...gnu.org>
Subject: Emulated Guest TLB flush IPIs in qemu-kvm

Hi all.
If the hardware does not support APIC virtualization: kvm_vcpu_kick sends an
host-IPI to the remote vcpu if that vcpu is in guest mode, a VM-exit
(exit reason: external interrupt) will be triggered due to the host-IPI.
Then on VM-entry (inject_pending_event) the guest-IPI is injected. If
that IPI is a TLB flush IPI,
what will happen if the target vcpu access the stale tlb entry before
the host-IPI arrives?
Thanks for your time!

Best Wishes,
Yaohui Hu
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