linux-kernel - Re: [PATCH v3] kvm: make vcpu life cycle separated from kvm instance

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Date:	Tue, 13 Dec 2011 13:54:36 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	Liu Ping Fan <kernelfans@...il.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, avi@...hat.com, aliguori@...ibm.com,
	jan.kiszka@....de
Subject: Re: [PATCH v3] kvm: make vcpu life cycle separated from kvm instance

On Tue, Dec 13, 2011 at 09:36:28AM -0200, Marcelo Tosatti wrote:
> On Mon, Dec 12, 2011 at 10:41:23AM +0800, Liu Ping Fan wrote:
> > From: Liu Ping Fan <pingfank@...ux.vnet.ibm.com>
> > 
> > Currently, vcpu can be destructed only when kvm instance destroyed.
> > Change this to vcpu's destruction taken when its refcnt is zero,
> > and then vcpu MUST and CAN be destroyed before kvm's destroy.
> > 
> > Signed-off-by: Liu Ping Fan <pingfank@...ux.vnet.ibm.com>
> > ---
> >  arch/x86/kvm/i8254.c     |   10 ++++--
> >  arch/x86/kvm/i8259.c     |   12 +++++--
> >  arch/x86/kvm/mmu.c       |    7 ++--
> >  arch/x86/kvm/x86.c       |   54 +++++++++++++++++++----------------
> >  include/linux/kvm_host.h |   71 ++++++++++++++++++++++++++++++++++++++++++----
> >  virt/kvm/irq_comm.c      |    7 +++-
> >  virt/kvm/kvm_main.c      |   62 +++++++++++++++++++++++++++++++++------
> >  7 files changed, 170 insertions(+), 53 deletions(-)
> 
> This needs a full audit of paths that access vcpus. See for one example
> bsp_vcpu pointer.
> 
Yes. For now we should probably disallow removal of bsp, but we need to
get rid of bsp_vcpu at all. It is used only in two places. IOAPIC can be
changed to use kvm->bsp_vcpu_id and pic's use looks incorrect anyway.

--
			Gleb.
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