linux-kernel - Re: [PATCH] x86/sgx: Add missing xa_destroy() when virtual EPC is destroyed

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Date:   Tue, 15 Jun 2021 08:39:36 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Kai Huang <kai.huang@...el.com>, linux-sgx@...r.kernel.org,
        x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, bp@...en8.de, seanjc@...gle.com,
        jarkko@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        Yang Zhong <yang.zhong@...el.com>
Subject: Re: [PATCH] x86/sgx: Add missing xa_destroy() when virtual EPC is
 destroyed

On 6/15/21 3:16 AM, Kai Huang wrote:
> xa_destroy() needs to be called to destroy virtual EPC's page arra
> before calling kfree() to free the virtual EPC.  Currently it is not
> calaled.  Add the missing xa_destroy() to fix.

Looks good Kai, thanks for fixing this.

Could you please take a good look through the sgx_release() and the vpec
equivalent and see if anything else stands out as possibly being missed?
 Also, is this the kind of thing that a simple open/add/close selftest
might have found?

Maybe we should beef up the selftests a bit.

Acked-by: Dave Hansen <dave.hansen@...el.com>