linux-kernel - Re: [PATCH v3 03/25] x86/sgx: Wipe out EREMOVE from sgx_free_epc

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Message-Id: <20210323112303.5eddd954ee601fca00b37aa3@intel.com>
Date:   Tue, 23 Mar 2021 11:23:03 +1300
From:   Kai Huang <kai.huang@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Sean Christopherson <seanjc@...gle.com>, kvm@...r.kernel.org,
        x86@...nel.org, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org, jarkko@...nel.org, luto@...nel.org,
        dave.hansen@...el.com, rick.p.edgecombe@...el.com,
        haitao.huang@...el.com, pbonzini@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com
Subject: Re: [PATCH v3 03/25] x86/sgx: Wipe out EREMOVE from
 sgx_free_epc_page()


> 
> Btw, I probably have seen this and forgotten again so pls remind me,
> is the amount of pages available for SGX use static and limited by,
> I believe BIOS, or can a leakage in EPC pages cause system memory
> shortage?
> 

Yes EPC size is fixed and configured in BIOS. Leaking EPC pages may cause EPC
shortage, but not system memory.