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Re: [PATCH v2] x86/vmx: Avoid pausing on HVM_PARAM_IDENT_PT in additional cases
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 22 Apr 2026 10:50:32 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 22 Apr 2026 08:50:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.04.2026 11:36, Teddy Astie wrote:
> --- a/xen/arch/x86/hvm/hvm.c
> +++ b/xen/arch/x86/hvm/hvm.c
> @@ -4237,11 +4237,13 @@ static int hvm_set_param(struct domain *d, uint32_t
> index, uint64_t value)
> rc = -EINVAL;
> break;
> case HVM_PARAM_IDENT_PT:
> + v = domain_vcpu(d, 0);
> +
> /*
> * Only actually required for VT-x lacking unrestricted_guest
> * capabilities. Short circuit the pause if possible.
> */
> - if ( paging_mode_shadow(d) || !using_vmx() )
> + if ( paging_mode_shadow(d) || !using_vmx() || !v ||
> vmx_unrestricted_guest(v) )
> {
> d->arch.hvm.params[index] = value;
> break;
Btw, considering the use in vmx_update_guest_cr(), why not also when
!hvm_paging_enabled(v)?
Jan
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