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From: Tom Lendacky <thomas.lendacky@amd.com>
To: Lianbo Jiang <lijiang@redhat.com>, linux-kernel@vger.kernel.org
Cc: kexec@lists.infradead.org, dyoung@redhat.com
Subject: Re: [PATCH 1/2] add a function(ioremap_encrypted) for kdump when AMD sme enabled.
Date: Tue, 15 May 2018 09:34:49 -0500	[thread overview]
Message-ID: <8c8f20cc-b39d-137c-9d71-1e566f905acb@amd.com> (raw)
In-Reply-To: <20180515015133.4363-2-lijiang@redhat.com>

On 5/14/2018 8:51 PM, Lianbo Jiang wrote:
> It is convenient to remap the old memory encrypted to the second kernel
> by calling ioremap_encrypted().
> 
> Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
> ---
>  arch/x86/include/asm/io.h |  2 ++
>  arch/x86/mm/ioremap.c     | 25 +++++++++++++++++--------
>  2 files changed, 19 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
> index f6e5b93..06d2a9f 100644
> --- a/arch/x86/include/asm/io.h
> +++ b/arch/x86/include/asm/io.h
> @@ -192,6 +192,8 @@ extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
>  #define ioremap_cache ioremap_cache
>  extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size, unsigned long prot_val);
>  #define ioremap_prot ioremap_prot
> +extern void __iomem *ioremap_encrypted(resource_size_t phys_addr, unsigned long size);
> +#define ioremap_encrypted ioremap_encrypted
>  
>  /**
>   * ioremap     -   map bus memory into CPU space
> diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
> index c63a545..7a52d1e 100644
> --- a/arch/x86/mm/ioremap.c
> +++ b/arch/x86/mm/ioremap.c
> @@ -131,7 +131,8 @@ static void __ioremap_check_mem(resource_size_t addr, unsigned long size,
>   * caller shouldn't need to know that small detail.
>   */
>  static void __iomem *__ioremap_caller(resource_size_t phys_addr,
> -		unsigned long size, enum page_cache_mode pcm, void *caller)
> +		unsigned long size, enum page_cache_mode pcm,
> +		void *caller, bool encrypted)
>  {
>  	unsigned long offset, vaddr;
>  	resource_size_t last_addr;
> @@ -199,7 +200,8 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
>  	 * resulting mapping.
>  	 */
>  	prot = PAGE_KERNEL_IO;
> -	if (sev_active() && mem_flags.desc_other)
> +	if ((sev_active() && mem_flags.desc_other) ||
> +			(encrypted && sme_active()))

You only need the encrypted check here.  If sme is not active,
then the pgprot_encrypted will basically be a no-op.

Also, extra indents.

Thanks,
Tom

>  		prot = pgprot_encrypted(prot);
>  
>  	switch (pcm) {
> @@ -291,7 +293,7 @@ void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size)
>  	enum page_cache_mode pcm = _PAGE_CACHE_MODE_UC_MINUS;
>  
>  	return __ioremap_caller(phys_addr, size, pcm,
> -				__builtin_return_address(0));
> +				__builtin_return_address(0), false);
>  }
>  EXPORT_SYMBOL(ioremap_nocache);
>  
> @@ -324,7 +326,7 @@ void __iomem *ioremap_uc(resource_size_t phys_addr, unsigned long size)
>  	enum page_cache_mode pcm = _PAGE_CACHE_MODE_UC;
>  
>  	return __ioremap_caller(phys_addr, size, pcm,
> -				__builtin_return_address(0));
> +				__builtin_return_address(0), false);
>  }
>  EXPORT_SYMBOL_GPL(ioremap_uc);
>  
> @@ -341,7 +343,7 @@ EXPORT_SYMBOL_GPL(ioremap_uc);
>  void __iomem *ioremap_wc(resource_size_t phys_addr, unsigned long size)
>  {
>  	return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WC,
> -					__builtin_return_address(0));
> +					__builtin_return_address(0), false);
>  }
>  EXPORT_SYMBOL(ioremap_wc);
>  
> @@ -358,14 +360,21 @@ EXPORT_SYMBOL(ioremap_wc);
>  void __iomem *ioremap_wt(resource_size_t phys_addr, unsigned long size)
>  {
>  	return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WT,
> -					__builtin_return_address(0));
> +					__builtin_return_address(0), false);
>  }
>  EXPORT_SYMBOL(ioremap_wt);
>  
> +void __iomem *ioremap_encrypted(resource_size_t phys_addr, unsigned long size)
> +{
> +	return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WB,
> +				__builtin_return_address(0), true);
> +}
> +EXPORT_SYMBOL(ioremap_encrypted);
> +
>  void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size)
>  {
>  	return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WB,
> -				__builtin_return_address(0));
> +				__builtin_return_address(0), false);
>  }
>  EXPORT_SYMBOL(ioremap_cache);
>  
> @@ -374,7 +383,7 @@ void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size,
>  {
>  	return __ioremap_caller(phys_addr, size,
>  				pgprot2cachemode(__pgprot(prot_val)),
> -				__builtin_return_address(0));
> +				__builtin_return_address(0), false);
>  }
>  EXPORT_SYMBOL(ioremap_prot);
>  
> 

  reply	other threads:[~2018-05-15 14:35 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-15  1:51 [PATCH 0/2] support kdump for AMD secure memory encryption(sme) Lianbo Jiang
2018-05-15  1:51 ` [PATCH 1/2] add a function(ioremap_encrypted) for kdump when AMD sme enabled Lianbo Jiang
2018-05-15 14:34   ` Tom Lendacky [this message]
2018-05-16 13:19     ` lijiang
2018-05-15  1:51 ` [PATCH 2/2] support kdump when AMD secure memory encryption is active Lianbo Jiang
2018-05-15 12:42   ` kbuild test robot
2018-05-15 20:18   ` Tom Lendacky
2018-05-16 15:02     ` lijiang
2018-05-17  0:47     ` lijiang
2018-05-15 13:31 ` [PATCH 0/2] support kdump for AMD secure memory encryption(sme) Tom Lendacky
2018-05-17 13:45   ` lijiang
2018-05-21  3:45     ` lijiang
2018-05-21 13:23       ` Tom Lendacky
2018-05-23  2:02         ` lijiang

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