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From: Josh Poimboeuf <jpoimboe@redhat.com>
To: speck@linutronix.de
Subject: [MODERATED] Re: [PATCH 3/4] V7 more sampling fun 3
Date: Tue, 14 Apr 2020 15:02:37 -0500	[thread overview]
Message-ID: <20200414200237.useaxfticfc4skqm@treble> (raw)
In-Reply-To: =?utf-8?q?=3C8fbdbe0dbc619f8c9d5f4cf7a1d2d4c8642f2ff3=2E15868?= =?utf-8?q?01416=2Egit=2Emgross=40linux=2Eintel=2Ecom=3E?=

On Thu, Jan 16, 2020 at 02:16:07PM -0800, speck for mark gross wrote:
> +enum srbds_mitigations {
> +	SRBDS_MITIGATION_OFF,
> +	SRBDS_MITIGATION_UCODE_NEEDED,
> +	SRBDS_MITIGATION_FULL,
> +	SRBDS_MITIGATION_NOT_AFFECTED_TSX_OFF,
> +	SRBDS_MITIGATION_HYPERVISOR,
> +};
> +
> +static enum srbds_mitigations srbds_mitigation __ro_after_init = SRBDS_MITIGATION_FULL;
> +static const char * const srbds_strings[] = {
> +	[SRBDS_MITIGATION_OFF]			= "Vulnerable",
> +	[SRBDS_MITIGATION_UCODE_NEEDED]		= "Vulnerable: No microcode",
> +	[SRBDS_MITIGATION_FULL]			= "Mitigated: Microcode",

s/Mitigated/Mitigation/ for consistency with other issues

> +	[SRBDS_MITIGATION_NOT_AFFECTED_TSX_OFF]	= "Not affected (TSX disabled)",

The CPU *is* affected, it just happens to be mitigated, right?

Shouldn't it be SRBDS_MITIGATION_TSX_OFF and "Mitigation: TSX disabled"?


> @@ -1142,6 +1166,34 @@ static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
>  	     (ia32_cap & ARCH_CAP_TSX_CTRL_MSR)))
>  		setup_force_cpu_bug(X86_BUG_TAA);
>  
> +	if (cpu_matches(SRBDS|SRBDS_IF_TSX, cpu_vuln_blacklist)) {
> +		/*
> +		 * Some parts on the list don't have RDRAND or RDSEED. Make sure
> +		 * they show as "Not affected".
> +		 */
> +		if (!cpu_has(c, X86_FEATURE_RDRAND) &&
> +		    !cpu_has(c, X86_FEATURE_RDSEED))
> +			goto srbds_not_affected;
> +		/*
> +		 * Parts in the blacklist that enumerate MDS_NO are only
> +		 * vulneralbe if TSX can be used.  To handle cases where TSX

"vulnerable"

> +		 * gets fused off check to see if TSX is fused off and thus not
> +		 * affected.
> +		 *
> +		 * When running with up to day microcode TSX_CTRL is only

"up-to-date"

> +		 * enumerated on parts where TSX fused on.

where TSX *is* fused on.

> +		 * When running with microcode not supporting TSX_CTRL we check
> +		 * for RTM

Missing period

> +		 */
> +		if ((ia32_cap & ARCH_CAP_MDS_NO) &&
> +		    !((ia32_cap & ARCH_CAP_TSX_CTRL_MSR) ||
> +		      cpu_has(c, X86_FEATURE_RTM)))
> +			goto srbds_not_affected;
> +
> +		setup_force_cpu_bug(X86_BUG_SRBDS);
> +	}
> +srbds_not_affected:
> +
>  	if (cpu_matches(NO_MELTDOWN, cpu_vuln_whitelist))
>  		return;

I'm thinking it would be more readable to have the newline between the
bracket and the 'if', instead of between the label and the 'if'.

-- 
Josh

  parent reply	other threads:[~2020-04-14 20:02 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-13 18:10 [MODERATED] [PATCH 0/4] V7 more sampling fun 0 mark gross
2020-01-16 22:16 ` [MODERATED] [PATCH 3/4] V7 more sampling fun 3 mark gross
2020-01-30 19:12 ` [MODERATED] [PATCH 4/4] V7 more sampling fun 4 mark gross
2020-03-17  0:56 ` [MODERATED] [PATCH 2/4] V7 more sampling fun 2 mark gross
2020-03-17  0:56 ` [MODERATED] [PATCH 1/4] V7 more sampling fun 1 mark gross
2020-04-14  3:48 ` [MODERATED] Re: [PATCH 3/4] V7 more sampling fun 3 mark gross
2020-04-14 16:23   ` Thomas Gleixner
2020-04-14 20:03     ` [MODERATED] " mark gross
2020-04-14 10:58 ` Thomas Gleixner
2020-04-14 16:43   ` [MODERATED] " mark gross
2020-04-14 20:02 ` Josh Poimboeuf [this message]
2020-04-14 21:03   ` mark gross
2020-04-14 21:23     ` Josh Poimboeuf
2020-04-14 21:53       ` mark gross
2020-04-14 20:05 ` Josh Poimboeuf
2020-04-14 21:59   ` mark gross
2020-04-14 22:46     ` Josh Poimboeuf
2020-04-15 20:59       ` mark gross
2020-04-15 12:58     ` Thomas Gleixner
2020-04-15 22:21       ` [MODERATED] " mark gross
2020-04-15 17:51 ` [MODERATED] Re: [PATCH 1/4] V7 more sampling fun 1 Borislav Petkov
2020-04-15 23:58   ` mark gross

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