linux-kernel - Re: [PATCHv2 3/3] x86/mm: Fix enc_status_change_finish

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Message-ID: <d92c6deb-e73c-9425-52ae-230285388d8e@linux.intel.com>
Date:   Tue, 30 May 2023 06:20:59 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        dave.hansen@...el.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de
Cc:     decui@...rosoft.com, rick.p.edgecombe@...el.com, seanjc@...gle.com,
        thomas.lendacky@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 3/3] x86/mm: Fix enc_status_change_finish_noop()



On 5/26/23 5:02 AM, Kirill A. Shutemov wrote:
> enc_status_change_finish_noop() defined as always-fail now which
> doesn't make sense for noop.
> 
> The change doesn't have user-visible effect because it only gets
> called if the platform has CC_ATTR_MEM_ENCRYPT. All platforms with
> the attribute override the callback with own implementation.
> 

Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---
>  arch/x86/kernel/x86_init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
> index f230d4d7d8eb..64664311ac2b 100644
> --- a/arch/x86/kernel/x86_init.c
> +++ b/arch/x86/kernel/x86_init.c
> @@ -131,7 +131,7 @@ struct x86_cpuinit_ops x86_cpuinit = {
>  static void default_nmi_init(void) { };
>  
>  static bool enc_status_change_prepare_noop(unsigned long vaddr, int npages, bool enc) { return true; }
> -static bool enc_status_change_finish_noop(unsigned long vaddr, int npages, bool enc) { return false; }
> +static bool enc_status_change_finish_noop(unsigned long vaddr, int npages, bool enc) { return true; }
>  static bool enc_tlb_flush_required_noop(bool enc) { return false; }
>  static bool enc_cache_flush_required_noop(void) { return false; }
>  static bool is_private_mmio_noop(u64 addr) {return false; }

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer