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Re: [PATCH v2 1/5] vmx: Refactor vpid_sync_vcpu_gva()
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 10 Sep 2026 17:43:08 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 10 Sep 2026 15:43:19 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31.07.2026 16:46, Teddy Astie wrote:
> --- a/xen/arch/x86/include/asm/hvm/vmx/vmx.h
> +++ b/xen/arch/x86/include/asm/hvm/vmx/vmx.h
> @@ -460,19 +460,16 @@ static inline void vpid_sync_vcpu_gva(struct vcpu *v,
> unsigned long gva)
> * If individual address invalidation is not supported, we escalate to
> * use single context invalidation.
> */
> - if ( likely(cpu_has_vmx_vpid_invvpid_individual_addr) )
> - goto execute_invvpid;
> -
> - type = INVVPID_SINGLE_CONTEXT;
> + if ( unlikely(!cpu_has_vmx_vpid_invvpid_individual_addr) )
> + type = INVVPID_SINGLE_CONTEXT;
>
> /*
> * If single context invalidation is not supported, we escalate to
> * use all context invalidation.
> */
> - if ( !cpu_has_vmx_vpid_invvpid_single_context )
> + if ( unlikely(!cpu_has_vmx_vpid_invvpid_single_context) )
> type = INVVPID_ALL_CONTEXT;
>
> -execute_invvpid:
> __invvpid(type, v->arch.hvm.n1asid.asid, (u64)gva);
> }
But this isn't functionally identical to the original, at least in the
cpu_has_vmx_vpid_invvpid_individual_addr &&
!cpu_has_vmx_vpid_invvpid_single_context case. We'd now end up using
INVVPID_ALL_CONTEXT there, when it wants to continue to be
INVVPID_INDIVIDUAL_ADDR.
Jan
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