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Re: [PATCH v2 1/2] x86/hvm/trace: Use a different trace type for AMD processors


  • To: George Dunlap <george.dunlap@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Thu, 23 May 2024 16:04:02 +0100
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  • Cc: Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxx>, Anthony Perard <anthony.perard@xxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Olaf Hering <olaf@xxxxxxxxx>
  • Delivery-date: Thu, 23 May 2024 15:04:13 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 23/05/2024 3:10 pm, George Dunlap wrote:
> A long-standing usability sub-optimality with xenalyze is the
> necessity to specify `--svm-mode` when analyzing AMD processors.  This
> fundamentally comes about because the same trace event ID is used for
> both VMX and SVM, but the contents of the trace must be interpreted
> differently.
>
> Instead, allocate separate trace events for VMX and SVM vmexits in
> Xen; this will allow all readers to properly interpret the meaning of
> the vmexit reason.
>
> In xenalyze, first remove the redundant call to init_hvm_data();
> there's no way to get to hvm_vmexit_process() without it being already
> initialized by the set_vcpu_type call in hvm_process().
>
> Replace this with set_hvm_exit_reson_data(), and move setting of
> hvm->exit_reason_* into that function.
>
> Modify hvm_process and hvm_vmexit_process to handle all four potential
> values appropriately.
>
> If SVM entries are encountered, set opt.svm_mode so that other
> SVM-specific functionality is triggered.
>
> Remove the `--svm-mode` command-line option, since it's now redundant.
>
> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxx>

Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>



 


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