linux-kernel - Re: [PATCH v5] x86/sgx: Free backing memory after faulting the enclave page

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Message-ID: <3a083b4d-9645-dec6-8cdc-481429dd0a1f@intel.com>
Date:   Tue, 1 Mar 2022 09:54:14 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>, linux-sgx@...r.kernel.org
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>, stable@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Jethro Beekman <jethro@...tanix.com>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] x86/sgx: Free backing memory after faulting the
 enclave page

On 3/1/22 04:58, Jarkko Sakkinen wrote:
> @@ -32,14 +58,16 @@ static int __sgx_encl_eldu(struct sgx_encl_page *encl_page,
>  	else
>  		page_index = PFN_DOWN(encl->size);
>  
> +	page_pcmd_off = sgx_encl_get_backing_page_pcmd_offset(encl, page_index);
> +
>  	ret = sgx_encl_lookup_backing(encl, page_index, &b);
>  	if (ret)
>  		return ret;

What tree is this against?  It looks like it might be on top of
Kristen's overcommit series.

It would be best if you could test this on top of tip/sgx.  Kristen
changed code in this area as well.