linux-kernel - Re: [RFC PATCH 03/20] x86/sgx: Track owning enclave in VA EPC pages

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Message-ID: <1adb03c8-1274-3898-0677-03015a1f5a5d@intel.com>
Date:   Thu, 22 Sep 2022 11:55:38 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Kristen Carlson Accardi <kristen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-sgx@...r.kernel.org,
        cgroups@...r.kernel.org, Jarkko Sakkinen <jarkko@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>
Cc:     Sean Christopherson <seanjc@...gle.com>
Subject: Re: [RFC PATCH 03/20] x86/sgx: Track owning enclave in VA EPC pages

On 9/22/22 10:10, Kristen Carlson Accardi wrote:
> -struct sgx_epc_page *sgx_alloc_va_page(bool reclaim)
> +struct sgx_epc_page *sgx_alloc_va_page(struct sgx_encl *encl, bool reclaim)
>  {
>  	struct sgx_epc_page *epc_page;
>  	int ret;
> @@ -1218,6 +1219,8 @@ struct sgx_epc_page *sgx_alloc_va_page(bool reclaim)
>  		return ERR_PTR(-EFAULT);
>  	}
>  
> +	epc_page->owner = encl;
> +
>  	return epc_page;
>  }

BTW, is there a flag or any other way to tell to what kind of object
->owner points?