linux-kernel - Re: [PATCH 2/2] kvm, MCE, Send SRAR SIGBUS directly

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Date:	Fri, 8 Oct 2010 21:37:08 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Avi Kivity <avi@...hat.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dean Nelson <dnelson@...hat.com>
Subject: Re: [PATCH 2/2] kvm, MCE, Send SRAR SIGBUS directly

On Fri, Oct 08, 2010 at 05:25:01PM -0300, Marcelo Tosatti wrote:
> On Fri, Oct 08, 2010 at 04:24:15PM +0800, Huang Ying wrote:
> > Originally, SRAR SIGBUS is sent to QEMU-KVM via touching the poisoned
> > page. But commit 96054569190bdec375fe824e48ca1f4e3b53dd36 prevents the
> > signal from being sent. So now the signal is sent via
> > force_sig_info_fault directly.
> > 
> > Reported-by: Dean Nelson <dnelson@...hat.com>
> > Signed-off-by: Huang Ying <ying.huang@...el.com>
> > ---
> >  arch/x86/include/asm/signal.h |    3 +++
> >  arch/x86/kvm/mmu.c            |   15 +++------------
> >  arch/x86/mm/fault.c           |    6 +++---
> >  3 files changed, 9 insertions(+), 15 deletions(-)
> > 
> >  static int kvm_handle_bad_page(struct kvm *kvm, gfn_t gfn, pfn_t pfn)
> >  {
> >  	kvm_release_pfn_clean(pfn);
> >  	if (is_hwpoison_pfn(pfn)) {
> > -		kvm_send_hwpoison_signal(kvm, gfn);
> > +		force_sig_info_fault(SIGBUS, BUS_MCEERR_AR,
> > +				     gfn_to_hva(kvm, gfn), current);
> >  		return 0;
> >  	} else if (is_fault_pfn(pfn))
> >  		return -EFAULT;
> 
> Better fill siginfo and use force_sig_info, which is already exported.

Thats wrong, its not exported. But there is no need to force delivery,
so i've changed it to use send_sig_info.

Applied the other patches, thanks.

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