x86/mm: Add Secure Encrypted Virtualization (SEV) support
Provide support for Secure Encrypted Virtualization (SEV). This initial support defines a flag that is used by the kernel to determine if it is running with SEV active. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@suse.de> Tested-by: Borislav Petkov <bp@suse.de> Cc: kvm@vger.kernel.org Cc: Borislav Petkov <bp@alien8.de> Cc: Andy Lutomirski <luto@kernel.org> Link: https://lkml.kernel.org/r/20171020143059.3291-3-brijesh.singh@amd.com
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@ -47,6 +47,9 @@ void __init mem_encrypt_init(void);
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void swiotlb_set_mem_attributes(void *vaddr, unsigned long size);
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bool sme_active(void);
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bool sev_active(void);
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#else /* !CONFIG_AMD_MEM_ENCRYPT */
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#define sme_me_mask 0ULL
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@ -64,6 +67,9 @@ static inline void __init sme_early_init(void) { }
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static inline void __init sme_encrypt_kernel(void) { }
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static inline void __init sme_enable(struct boot_params *bp) { }
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static inline bool sme_active(void) { return false; }
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static inline bool sev_active(void) { return false; }
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#endif /* CONFIG_AMD_MEM_ENCRYPT */
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/*
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@ -42,6 +42,8 @@ static char sme_cmdline_off[] __initdata = "off";
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u64 sme_me_mask __section(.data) = 0;
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EXPORT_SYMBOL_GPL(sme_me_mask);
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static bool sev_enabled __section(.data);
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/* Buffer used for early in-place encryption by BSP, no locking needed */
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static char sme_early_buffer[PAGE_SIZE] __aligned(PAGE_SIZE);
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@ -192,6 +194,30 @@ void __init sme_early_init(void)
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protection_map[i] = pgprot_encrypted(protection_map[i]);
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}
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/*
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* SME and SEV are very similar but they are not the same, so there are
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* times that the kernel will need to distinguish between SME and SEV. The
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* sme_active() and sev_active() functions are used for this. When a
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* distinction isn't needed, the mem_encrypt_active() function can be used.
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*
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* The trampoline code is a good example for this requirement. Before
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* paging is activated, SME will access all memory as decrypted, but SEV
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* will access all memory as encrypted. So, when APs are being brought
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* up under SME the trampoline area cannot be encrypted, whereas under SEV
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* the trampoline area must be encrypted.
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*/
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bool sme_active(void)
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{
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return sme_me_mask && !sev_enabled;
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}
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EXPORT_SYMBOL_GPL(sme_active);
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bool sev_active(void)
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{
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return sme_me_mask && sev_enabled;
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}
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EXPORT_SYMBOL_GPL(sev_active);
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/* Architecture __weak replacement functions */
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void __init mem_encrypt_init(void)
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{
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@ -23,11 +23,14 @@
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#define sme_me_mask 0ULL
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static inline bool sme_active(void) { return false; }
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static inline bool sev_active(void) { return false; }
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#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
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static inline bool sme_active(void)
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static inline bool mem_encrypt_active(void)
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{
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return !!sme_me_mask;
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return sme_me_mask;
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}
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static inline u64 sme_get_me_mask(void)
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