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Re: [Xen-devel] [PATCH RFC V4 5/5] Documentation/kvm : Add documentation on Hypercalls and features used for PV spinlock
- To: Gleb Natapov <gleb@xxxxxxxxxx>
- From: Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>
- Date: Tue, 17 Jan 2012 17:56:50 +0530
- Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Jan Kiszka <jan.kiszka@xxxxxxxxxxx>, Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Randy Dunlap <rdunlap@xxxxxxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Xen <xen-devel@xxxxxxxxxxxxxxxxxxx>, Dave Jiang <dave.jiang@xxxxxxxxx>, Glauber Costa <glommer@xxxxxxxxxx>, X86 <x86@xxxxxxxxxx>, Alexander Graf <agraf@xxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Sasha Levin <levinsasha928@xxxxxxxxx>, Sedat Dilek <sedat.dilek@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>, Suzuki Poulose <suzuki@xxxxxxxxxxxxxxxxxx>, Rob Landley <rlandley@xxxxxxxxxxxxx>
- Delivery-date: Wed, 18 Jan 2012 10:35:20 +0000
- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
* Gleb Natapov <gleb@xxxxxxxxxx> [2012-01-17 11:14:13]:
> > The problem case I was thinking of was when guest VCPU would have issued
> > HLT with interrupts disabled. I guess one option is to inject an NMI,
> > and have the guest kernel NMI handler recognize this and make
> > adjustments such that the vcpu avoids going back to HLT instruction.
> >
> Just kick vcpu out of a guest mode and adjust rip to point after HLT on
> next re-entry. Don't forget to call vmx_clear_hlt().
Looks bit hackish to me compared to having another hypercall to yield!
> > Having another hypercall to do yield/sleep (rather than effecting that
> > via HLT) seems like an alternate clean solution here ..
- vatsa
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