From: Baoquan He <bhe@redhat.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org
Cc: mingo@redhat.com, tglx@linutronix.de, hpa@zytor.com,
thgarnie@google.com, keescook@chromium.org,
akpm@linux-foundation.org, yamada.masahiro@socionext.com,
rja@hpe.com, frank.ramsay@hpe.com, dyoung@redhat.com
Subject: Re: [PATCH v2 RESEND 1/2] x86/UV: Introduce a helper function to check UV system at earlier stage
Date: Thu, 14 Sep 2017 15:29:52 +0800 [thread overview]
Message-ID: <20170914072952.GN12824@x1> (raw)
In-Reply-To: <1504770150-25456-2-git-send-email-bhe@redhat.com>
Add Dave to the CC list, he may have concerns about the code change.
On 09/07/17 at 03:42pm, Baoquan He wrote:
> The BIOS on SGI UV system will report a UV system table which describes
> specific firmware capabilities available to the Linux kernel at runtime.
> This UV system table only exists on SGI UV system. And it's detected
> in efi_init() which is at very early stage.
>
> So introduce a new helper function is_early_uv_system() to identify if
> a system is UV system. Later we will use it to check if the running
> system is UV system in mm KASLR code.
>
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Acked-by: Mike Travis <travis@sgi.com>
> ---
> arch/x86/include/asm/uv/uv.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/arch/x86/include/asm/uv/uv.h b/arch/x86/include/asm/uv/uv.h
> index b5a32231abd8..93d7ad8763ba 100644
> --- a/arch/x86/include/asm/uv/uv.h
> +++ b/arch/x86/include/asm/uv/uv.h
> @@ -18,6 +18,11 @@ extern void uv_nmi_init(void);
> extern void uv_system_init(void);
> extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
> const struct flush_tlb_info *info);
> +#include <linux/efi.h>
> +static inline int is_early_uv_system(void)
> +{
> + return !((efi.uv_systab == EFI_INVALID_TABLE_ADDR) || !efi.uv_systab);
> +}
>
> #else /* X86_UV */
>
> @@ -30,6 +35,7 @@ static inline const struct cpumask *
> uv_flush_tlb_others(const struct cpumask *cpumask,
> const struct flush_tlb_info *info)
> { return cpumask; }
> +static inline int is_early_uv_system(void) { return 0; }
>
> #endif /* X86_UV */
>
> --
> 2.5.5
>
next prev parent reply other threads:[~2017-09-14 7:30 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-07 7:42 [PATCH v2 RESEND 0/2] x86/mm/KASLR: Do not adapt the size of the direct mapping section for SGI UV system Baoquan He
2017-09-07 7:42 ` [PATCH v2 RESEND 1/2] x86/UV: Introduce a helper function to check UV system at earlier stage Baoquan He
2017-09-14 7:29 ` Baoquan He [this message]
2017-09-14 7:49 ` Dave Young
2017-09-14 8:08 ` Baoquan He
2017-09-15 0:47 ` Dave Young
2017-09-15 0:55 ` Dave Young
2017-09-07 7:42 ` [PATCH v2 RESEND 2/2] x86/mm/KASLR: Do not adapt the size of the direct mapping section for SGI UV system Baoquan He
2017-09-28 7:56 ` Ingo Molnar
2017-09-28 8:31 ` Baoquan He
2017-09-28 9:01 ` Ingo Molnar
2017-09-28 14:10 ` Mike Travis
2017-09-30 11:25 ` Baoquan He
2018-05-17 3:18 ` Baoquan He
2018-05-17 15:06 ` Ramsay, Frank
2018-05-17 15:47 ` Mike Travis
[not found] ` <53301a1e-e817-912f-cf7d-0000b078c7a3@hpe.com>
[not found] ` <20180523000306.GY24627@MiWiFi-R3L-srv>
[not found] ` <7ce3cc80-3991-f914-c539-9fa38256ea4b@hpe.com>
2018-05-31 3:26 ` Baoquan He
2017-09-14 1:44 ` [PATCH v2 RESEND 0/2] " Baoquan He
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