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Re: [XEN PATCH v4 06/14] x86/p2m: guard EPT functions with using_vmx() check
- To: Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 9 Jul 2024 09:19:24 +0200
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- Cc: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Xenia Ragiadakou <xenia.ragiadakou@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 09 Jul 2024 07:19:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 09.07.2024 07:56, Sergiy Kibrik wrote:
> From: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>
>
> Replace cpu_has_vmx check with using_vmx(), so that we do check if functions
> ept_p2m_init() and ept_p2m_uninit() can be called.
I still find this an odd way of putting it. Source code ...
> --- a/xen/arch/x86/mm/p2m-basic.c
> +++ b/xen/arch/x86/mm/p2m-basic.c
> @@ -40,7 +40,7 @@ static int p2m_initialise(struct domain *d, struct
> p2m_domain *p2m)
> p2m_pod_init(p2m);
> p2m_nestedp2m_init(p2m);
>
> - if ( hap_enabled(d) && cpu_has_vmx )
> + if ( hap_enabled(d) && using_vmx() )
> ret = ept_p2m_init(p2m);
> else
> p2m_pt_init(p2m);
> @@ -72,7 +72,7 @@ struct p2m_domain *p2m_init_one(struct domain *d)
> void p2m_free_one(struct p2m_domain *p2m)
> {
> p2m_free_logdirty(p2m);
> - if ( hap_enabled(p2m->domain) && cpu_has_vmx )
> + if ( hap_enabled(p2m->domain) && using_vmx() )
> ept_p2m_uninit(p2m);
> free_cpumask_var(p2m->dirty_cpumask);
> xfree(p2m);
... is very clear about them being called. What you're after is the compiler
DCEing the calls in generated code.
Jan
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