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Message-ID: <20191008071845.GA14765@zn.tnic>
Date: Tue, 8 Oct 2019 09:18:45 +0200
From: Borislav Petkov <bp@...en8.de>
To: Sean Christopherson <sean.j.christopherson@...el.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
linux-kernel@...r.kernel.org, x86@...nel.org,
linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
dave.hansen@...el.com, nhorman@...hat.com, npmccallum@...hat.com,
serge.ayoun@...el.com, shay.katz-zamir@...el.com,
haitao.huang@...el.com, andriy.shevchenko@...ux.intel.com,
tglx@...utronix.de, kai.svahn@...el.com, josh@...htriplett.org,
luto@...nel.org, kai.huang@...el.com, rientjes@...gle.com,
cedric.xing@...el.com
Subject: Re: [PATCH v22 07/24] x86/sgx: Add wrappers for ENCLS leaf functions
On Mon, Oct 07, 2019 at 09:04:05PM -0700, Sean Christopherson wrote:
> > BIT(30)
>
> This is intentionally open coded so that it can be stringified in asm.
It stringifies just fine with the BIT() macro too:
# 187 "arch/x86/kernel/cpu/sgx/encls.h" 1
1: .byte 0x0f, 0x01, 0xcf;
2:
.section .fixup,"ax"
3: orl $((((1UL))) << (30)),%eax
jmp 2b
.previous
and the resulting object:
Disassembly of section .fixup:
0000000000000000 <.fixup>:
0: 0d 00 00 00 40 or $0x40000000,%eax
5: e9 00 00 00 00 jmpq a <__addressable_sgx_free_page107+0x2>
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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