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Re: [PATCH v2 1/4] x86/hvm: Defer the size calculation in hvm_save_cpu_xsave_states()


  • To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Thu, 2 May 2024 14:08:32 +0200
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  • Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Thu, 02 May 2024 12:08:43 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 29.04.2024 20:28, Andrew Cooper wrote:
> HVM_CPU_XSAVE_SIZE() may rewrite %xcr0 twice.  Defer the caluclation it until
> after we've decided to write out an XSAVE record.
> 
> Note in hvm_load_cpu_xsave_states() that there were versions of Xen which
> wrote out a useless XSAVE record.  This sadly limits out ability to tidy up
> the existing infrastructure.  Also leave a note in xstate_ctxt_size() that 0
> still needs tolerating for now.
> 
> No functional change.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
with a nit that there are a few spelling/grammar issues in the text above.

Jan




 


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