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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Tom Lendacky <thomas.lendacky@amd.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bpetkov@suse.de>,
	David Woodhouse <dwmw@amazon.co.uk>
Subject: Re: [PATCH 1/2] x86/bugs: Update when to check for the LS_CFG SSBD mitigation
Date: Tue, 3 Jul 2018 10:12:03 -0400	[thread overview]
Message-ID: <20180703141203.GJ8404@char.us.oracle.com> (raw)
In-Reply-To: <20180702213553.29202.21089.stgit@tlendack-t1.amdoffice.net>

On Mon, Jul 02, 2018 at 04:35:53PM -0500, Tom Lendacky wrote:
> If either the X86_FEATURE_AMD_SSBD or X86_FEATURE_VIRT_SSBD features are
> present, then there is no need to perform the check for the LS_CFG SSBD
> mitigation support.
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

> ---
>  arch/x86/kernel/cpu/amd.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
> index 082d787..38915fb 100644
> --- a/arch/x86/kernel/cpu/amd.c
> +++ b/arch/x86/kernel/cpu/amd.c
> @@ -543,7 +543,9 @@ static void bsp_init_amd(struct cpuinfo_x86 *c)
>  		nodes_per_socket = ((value >> 3) & 7) + 1;
>  	}
>  
> -	if (c->x86 >= 0x15 && c->x86 <= 0x17) {
> +	if (!boot_cpu_has(X86_FEATURE_AMD_SSBD) &&
> +	    !boot_cpu_has(X86_FEATURE_VIRT_SSBD) &&
> +	    c->x86 >= 0x15 && c->x86 <= 0x17) {
>  		unsigned int bit;
>  
>  		switch (c->x86) {
> 

  parent reply	other threads:[~2018-07-03 14:12 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-02 21:35 [PATCH 0/2] x86/bugs: Updates to SSBD support on AMD Tom Lendacky
2018-07-02 21:35 ` [PATCH 1/2] x86/bugs: Update when to check for the LS_CFG SSBD mitigation Tom Lendacky
2018-07-03  8:33   ` [tip:x86/pti] " tip-bot for Tom Lendacky
2018-07-03 14:12   ` Konrad Rzeszutek Wilk [this message]
2018-07-02 21:36 ` [PATCH 2/2] x86/bugs: Fix the AMD SSBD usage of the SPEC_CTRL MSR Tom Lendacky
2018-07-03  8:34   ` [tip:x86/pti] " tip-bot for Tom Lendacky
2018-07-03 14:12   ` [PATCH 2/2] " Konrad Rzeszutek Wilk

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