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Message-ID: <20170914072952.GN12824@x1> Date: Thu, 14 Sep 2017 15:29:52 +0800 From: Baoquan He <bhe@...hat.com> To: linux-kernel@...r.kernel.org, x86@...nel.org Cc: mingo@...hat.com, tglx@...utronix.de, hpa@...or.com, thgarnie@...gle.com, keescook@...omium.org, akpm@...ux-foundation.org, yamada.masahiro@...ionext.com, rja@....com, frank.ramsay@....com, dyoung@...hat.com Subject: Re: [PATCH v2 RESEND 1/2] x86/UV: Introduce a helper function to check UV system at earlier stage 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@...hat.com> > Acked-by: Mike Travis <travis@....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 >
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