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Re: [PATCH v2 1/3] x86/svm: Add infrastructure for Bus Lock Threshold
- To: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
- Date: Wed, 21 Jan 2026 16:13:51 +0100
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>
- Delivery-date: Wed, 21 Jan 2026 15:14:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Wed Jan 21, 2026 at 3:28 PM CET, Alejandro Vallejo wrote:
> Add missing scaffolding to enable BusLock Threshold. That is:
>
> * Add general_intercepts_3.
> * Add missing VMEXIT
> * Adjust NPF perf counter base to immediately after the buslock counter
>
> Signed-off-by: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
> Reviewed-by: Teddy Astie <teddy.astie@xxxxxxxxxx>
> ---
> v2:
> * s/general intercepts 2/general intercepts 3/
> * removed _thresh suffix
> * added missing _svm_ infix in the SVM feature
> ---
> xen/arch/x86/hvm/svm/vmcb.h | 15 +++++++++++++--
> xen/arch/x86/include/asm/hvm/svm.h | 2 ++
> xen/arch/x86/include/asm/perfc_defn.h | 2 +-
> 3 files changed, 16 insertions(+), 3 deletions(-)
>
> diff --git a/xen/arch/x86/hvm/svm/vmcb.h b/xen/arch/x86/hvm/svm/vmcb.h
> index ba554a9644..231f9b1b06 100644
> --- a/xen/arch/x86/hvm/svm/vmcb.h
> +++ b/xen/arch/x86/hvm/svm/vmcb.h
> @@ -65,6 +65,11 @@ enum GenericIntercept2bits
> GENERAL2_INTERCEPT_RDPRU = 1 << 14,
> };
>
> +/* general 3 intercepts */
I had already sent v2 by the time I noticed the request to capitalise G. Feel
free to fix on commit or let me know to resend.
Cheers,
Alejandro
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