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From: Borislav Petkov <bp@alien8.de>
To: Kuppuswamy Sathyanarayanan  <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	x86@kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
	Juergen Gross <jgross@suse.com>, Deep Shah <sdeep@vmware.com>,
	VMware Inc <pv-drivers@vmware.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	Peter H Anvin <hpa@zytor.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Tony Luck <tony.luck@intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Andi Kleen <ak@linux.intel.com>,
	Kirill Shutemov <kirill.shutemov@linux.intel.com>,
	Sean Christopherson <seanjc@google.com>,
	Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 01/11] x86/paravirt: Move halt paravirt calls under CONFIG_PARAVIRT
Date: Fri, 3 Sep 2021 20:22:08 +0200	[thread overview]
Message-ID: <YTJn0HOkMd0thT+3@zn.tnic> (raw)
In-Reply-To: <20210903172812.1097643-2-sathyanarayanan.kuppuswamy@linux.intel.com>

On Fri, Sep 03, 2021 at 10:28:02AM -0700, Kuppuswamy Sathyanarayanan wrote:
> diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h
> index c5ce9845c999..ddc77c95adc6 100644
> --- a/arch/x86/include/asm/irqflags.h
> +++ b/arch/x86/include/asm/irqflags.h
> @@ -59,27 +59,8 @@ static inline __cpuidle void native_halt(void)
>  
>  #endif
>  
> -#ifdef CONFIG_PARAVIRT_XXL
> -#include <asm/paravirt.h>
> -#else
> +#ifndef CONFIG_PARAVIRT
>  #ifndef __ASSEMBLY__
> -#include <linux/types.h>
> -
> -static __always_inline unsigned long arch_local_save_flags(void)
> -{
> -	return native_save_fl();
> -}
> -
> -static __always_inline void arch_local_irq_disable(void)
> -{
> -	native_irq_disable();
> -}
> -
> -static __always_inline void arch_local_irq_enable(void)
> -{
> -	native_irq_enable();
> -}
> -
>  /*
>   * Used in the idle loop; sti takes one instruction cycle
>   * to complete:
> @@ -97,6 +78,33 @@ static inline __cpuidle void halt(void)
>  {
>  	native_halt();
>  }
> +#endif /* __ASSEMBLY__ */
> +#endif /* CONFIG_PARAVIRT */
> +
> +#ifdef CONFIG_PARAVIRT
> +#ifndef __ASSEMBLY__
> +#include <asm/paravirt.h>
> +#endif /* __ASSEMBLY__ */
> +#endif /* CONFIG_PARAVIRT */

I think the way we write those is like this:

#ifdef CONFIG_PARAVIRT

# ifndef __ASSEMBLY__
# include <asm/paravirt.h>
# endif

#else /* ! CONFIG_PARAVIRT */

# ifndef __ASSEMBLY__
/*
 * Used in the idle loop; sti takes one instruction cycle
 * to complete:
 */
static inline __cpuidle void arch_safe_halt(void)
{
	native_safe_halt();
}

/*
 * Used when interrupts are already enabled or to
 * shutdown the processor:
 */
static inline __cpuidle void halt(void)
{
	native_halt();
}
# endif /* __ASSEMBLY__ */

#endif /* CONFIG_PARAVIRT */

Note the empty space after the '#' of the inner ifdef to show that it is
an inner one.

Also, this header has clearly too many #if*def __ASSEMBLY__ things
sprinkled around. Lemme see if I can get rid of them so that it is at
least a bit readable.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

  reply	other threads:[~2021-09-03 18:21 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-03 17:28 [PATCH v6 00/11] Add TDX Guest Support (Initial support) Kuppuswamy Sathyanarayanan
2021-09-03 17:28 ` [PATCH v6 01/11] x86/paravirt: Move halt paravirt calls under CONFIG_PARAVIRT Kuppuswamy Sathyanarayanan
2021-09-03 18:22   ` Borislav Petkov [this message]
2021-09-03 19:03     ` Kuppuswamy, Sathyanarayanan
2021-09-03 20:33       ` Borislav Petkov
2021-09-03 17:28 ` [PATCH v6 02/11] x86/tdx: Introduce INTEL_TDX_GUEST config option Kuppuswamy Sathyanarayanan
2021-09-28 11:37   ` Joerg Roedel
2021-09-28 12:52     ` Kuppuswamy, Sathyanarayanan
2021-09-03 17:28 ` [PATCH v6 03/11] x86/cpufeatures: Add TDX Guest CPU feature Kuppuswamy Sathyanarayanan
2021-09-28 11:39   ` Joerg Roedel
2021-09-28 12:53     ` Kuppuswamy, Sathyanarayanan
2021-09-03 17:28 ` [PATCH v6 04/11] x86/tdx: Add protected guest support for TDX guest Kuppuswamy Sathyanarayanan
2021-09-28 11:46   ` Joerg Roedel
2021-09-28 12:56     ` Kuppuswamy, Sathyanarayanan
2021-09-28 13:04       ` Joerg Roedel
2021-09-28 13:18         ` Borislav Petkov
2021-09-03 17:28 ` [PATCH v6 05/11] x86/tdx: Add __tdx_module_call() and __tdx_hypercall() helper functions Kuppuswamy Sathyanarayanan
2021-09-03 17:28 ` [PATCH v6 06/11] x86/traps: Add #VE support for TDX guest Kuppuswamy Sathyanarayanan
2021-09-28 12:16   ` Joerg Roedel
2021-09-28 14:05     ` Dave Hansen
2021-09-28 15:22       ` Joerg Roedel
2021-09-28 15:25         ` Dave Hansen
2021-09-28 15:23   ` Dave Hansen
2021-09-28 16:59     ` Kuppuswamy, Sathyanarayanan
2021-09-03 17:28 ` [PATCH v6 07/11] x86/tdx: Add HLT " Kuppuswamy Sathyanarayanan
2021-09-03 17:28 ` [PATCH v6 08/11] x86/tdx: Wire up KVM hypercalls Kuppuswamy Sathyanarayanan
2021-09-03 17:28 ` [PATCH v6 09/11] x86/tdx: Add MSR support for TDX guest Kuppuswamy Sathyanarayanan
2021-09-03 17:28 ` [PATCH v6 10/11] x86/tdx: Don't write CSTAR MSR on Intel Kuppuswamy Sathyanarayanan
2021-09-03 17:28 ` [PATCH v6 11/11] x86/tdx: Handle CPUID via #VE Kuppuswamy Sathyanarayanan
2021-09-03 18:35   ` Dave Hansen
2021-09-03 19:14     ` Kuppuswamy, Sathyanarayanan
2021-09-03 23:43       ` Sean Christopherson
2021-09-03 23:54         ` Andi Kleen
2021-09-04  0:00           ` Dave Hansen
2021-09-04  0:05             ` Andi Kleen

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