From: Joerg Roedel <joro@8bytes.org>
To: Alexander Graf <agraf@suse.de>
Cc: kvm@vger.kernel.org, anthony@codemonkey.ws, avi@qumranet.com
Subject: Re: [PATCH 4/9] Implement GIF, clgi and stgi v3
Date: Thu, 25 Sep 2008 23:27:49 +0200 [thread overview]
Message-ID: <20080925212749.GN27426@8bytes.org> (raw)
In-Reply-To: <A9CE947D-F68B-46C6-AADC-31F7EEEECC6E@suse.de>
On Thu, Sep 25, 2008 at 09:55:27PM +0200, Alexander Graf wrote:
>
> On 25.09.2008, at 20:47, Joerg Roedel wrote:
>
> >I had another possible idea for performance improvement here. Since we
> >only inject normal interrupts and exceptions (and not NMI and such) we
> >can patch clgi to cli and stgi to sti to save these two intercepts in
> >the guests vmrun path.
> >Any objections/problems with this?
>
> How do we know if we're allowed to inject interrupts with V_INTR set?
> Usually IF is on and GIF is off when entering the VM in KVM, so we
> allow interrupts to arrive even when IF is clear in the guest...
Hmm yes, this is a problem. So this optimization will not work. We need
other ways to optimize :)
Joerg
next prev parent reply other threads:[~2008-09-25 21:27 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-17 13:41 [PATCH 0/9] Add support for nested SVM (kernel) v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 1/9] Add CPUID feature flag for SVM v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 2/9] Clean up VINTR setting v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 3/9] Add helper functions for nested SVM v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 4/9] Implement GIF, clgi and stgi v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 5/9] Implement hsave v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 6/9] Add VMLOAD and VMSAVE handlers v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 7/9] Add VMRUN handler v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 8/9] Add VMEXIT handler and intercepts v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 9/9] Allow setting the SVME bit v3 Alexander Graf
2008-09-19 15:59 ` [PATCH 7/9] Add VMRUN handler v3 Joerg Roedel
2008-09-25 17:32 ` Alexander Graf
2008-09-25 17:37 ` Joerg Roedel
2008-09-25 20:00 ` Alexander Graf
2008-09-25 21:22 ` joro
2008-09-27 12:59 ` Avi Kivity
2008-09-27 12:58 ` Avi Kivity
2008-09-25 18:47 ` [PATCH 4/9] Implement GIF, clgi and stgi v3 Joerg Roedel
2008-09-25 19:55 ` Alexander Graf
2008-09-25 21:27 ` Joerg Roedel [this message]
2008-09-26 9:01 ` Alexander Graf
2008-09-27 12:55 ` Avi Kivity
2008-09-27 12:52 ` Avi Kivity
2008-09-19 14:36 ` [PATCH 0/9] Add support for nested SVM (kernel) v3 Joerg Roedel
2008-09-19 14:39 ` Joerg Roedel
2008-09-19 15:56 ` Joerg Roedel
2008-10-15 17:07 ` Alexander Graf
2008-09-19 21:48 ` First performance numbers Joerg Roedel
2008-09-20 1:30 ` Avi Kivity
2008-09-20 6:55 ` Joerg Roedel
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