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Date:   Mon, 4 Apr 2022 02:50:21 +0300
From:   Jarkko Sakkinen <jarkko@kernel.org>
To:     linux-sgx@vger.kernel.org
Cc:     dave.hansen@linux.intel.com, reinette.chatre@intel.com
Subject: Odd looking #PF fault code
Message-ID: <YkoyvdqIqkaOk8NL@kernel.org>
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I get this when trying to get EAUG-EACCEPTCOPY to run on Enarx and I get:

Unexpected PF: address: 0x007f7fff910000, error code 0x15

I'm using patches from:

https://github.com/rchatre/linux/tree/sgx/sgx2_submitted_v2_plus_rwx

Fault code is in other words PROT|WRITE|USER|RSVD.

According to arch/x86/kernel/fault.c:

	/*
	 * Reserved bits are never expected to be set on
	 * entries in the user portion of the page tables.
	 */
	if (unlikely(error_code & X86_PF_RSVD))
		pgtable_bad(regs, error_code, address);

Any clue how this fault code could emit?

[*] https://github.com/enarx/enarx/pull/1608

BR, Jarkko