[PATCH v3 5/8] x86/sme: Replace occurrences of sme_active() with cc_platform_has()

[Borislav Petkov]

On Wed, Sep 08, 2021 at 05:58:36PM -0500, Tom Lendacky wrote:
> diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
> index 18fe19916bc3..4b54a2377821 100644
> --- a/arch/x86/mm/mem_encrypt.c
> +++ b/arch/x86/mm/mem_encrypt.c
> @@ -144,7 +144,7 @@ void __init sme_unmap_bootdata(char *real_mode_data)
>  	struct boot_params *boot_data;
>  	unsigned long cmdline_paddr;
>  
> -	if (!sme_active())
> +	if (!cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT))
>  		return;
>  
>  	/* Get the command line address before unmapping the real_mode_data */
> @@ -164,7 +164,7 @@ void __init sme_map_bootdata(char *real_mode_data)
>  	struct boot_params *boot_data;
>  	unsigned long cmdline_paddr;
>  
> -	if (!sme_active())
> +	if (!cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT))
>  		return;
>  
>  	__sme_early_map_unmap_mem(real_mode_data, sizeof(boot_params), true);
> @@ -377,11 +377,6 @@ bool sev_active(void)
>  {
>  	return sev_status & MSR_AMD64_SEV_ENABLED;
>  }
> -
> -bool sme_active(void)
> -{
> -	return sme_me_mask && !sev_active();
> -}
>  EXPORT_SYMBOL_GPL(sev_active);
>  
>  /* Needs to be called from non-instrumentable code */

You forgot this hunk:

diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 5635ca9a1fbe..a3a2396362a5 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -364,8 +364,9 @@ int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size)
 /*
  * SME and SEV are very similar but they are not the same, so there are
  * times that the kernel will need to distinguish between SME and SEV. The
- * sme_active() and sev_active() functions are used for this.  When a
- * distinction isn't needed, the mem_encrypt_active() function can be used.
+ * PATTR_HOST_MEM_ENCRYPT and PATTR_GUEST_MEM_ENCRYPT flags to
+ * amd_prot_guest_has() are used for this. When a distinction isn't needed,
+ * the mem_encrypt_active() function can be used.
  *
  * The trampoline code is a good example for this requirement.  Before
  * paging is activated, SME will access all memory as decrypted, but SEV

because there's still a sme_active() mentioned there:

$ git grep sme_active
arch/x86/mm/mem_encrypt.c:367: * sme_active() and sev_active() functions are used for this.  When a

-- 
Regards/Gruss,
    Boris.

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