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Message-ID: <87o7lu6rjf.ffs@tglx>
Date: Mon, 05 Jun 2023 14:07:48 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Xin Li <xin3.li@...el.com>, linux-kernel@...r.kernel.org,
x86@...nel.org, kvm@...r.kernel.org
Cc: mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
hpa@...or.com, peterz@...radead.org, andrew.cooper3@...rix.com,
seanjc@...gle.com, pbonzini@...hat.com, ravi.v.shankar@...el.com,
jiangshanlai@...il.com, shan.kang@...el.com
Subject: Re: [PATCH v8 02/33] x86/fred: make unions for the cs and ss fields
in struct pt_regs
On Mon, Apr 10 2023 at 01:14, Xin Li wrote:
> + union {
> + unsigned long csx; /* cs extended: CS + any fields above it */
> + struct __attribute__((__packed__)) {
> + unsigned short cs; /* CS selector proper */
> + unsigned int current_stack_level: 2;
> + unsigned int __csx_resv1 : 6;
> + unsigned int interrupt_shadowed : 1;
> + unsigned int software_initiated : 1;
> + unsigned int __csx_resv2 : 2;
> + unsigned int nmi : 1;
> + unsigned int __csx_resv3 : 3;
> + unsigned int __csx_resv4 : 32;
> + };
> + };
> unsigned long flags;
> unsigned long sp;
> - unsigned long ss;
> + union {
> + unsigned long ssx; /* ss extended: SS + any fields above it */
> + struct __attribute__((__packed__)) {
> + unsigned short ss; /* SS selector proper */
> + unsigned int __ssx_resv1 : 16;
> + unsigned int vector : 8;
> + unsigned int __ssx_resv2 : 8;
> + unsigned int type : 4;
> + unsigned int __ssx_resv3 : 4;
> + unsigned int enclv : 1;
> + unsigned int long_mode : 1;
> + unsigned int nested : 1;
> + unsigned int __ssx_resv4 : 1;
> + unsigned int instr_len : 4;
> + };
> + };
This does not match section
5.2.1 Saving Information on the Regular Stack?
of version 4 and later of the specification.
Thanks,
tglx
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