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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2022-02-22 21:57:40 +0300
committerBorislav Petkov <bp@suse.de>2022-02-23 19:14:29 +0100
commitb577f542f93cbba57f8d6185ef1fb13a41ddf162 (patch)
treed64dab5aa4ad840955371fc024c3e0037929f682 /arch/x86/include/asm/coco.h
parent655a0fa34b4f7ac6e2b1406fab15e52a7b6accb1 (diff)
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x86/coco: Add API to handle encryption mask
AMD SME/SEV uses a bit in the page table entries to indicate that the page is encrypted and not accessible to the VMM. TDX uses a similar approach, but the polarity of the mask is opposite to AMD: if the bit is set the page is accessible to VMM. Provide vendor-neutral API to deal with the mask: cc_mkenc() and cc_mkdec() modify given address to make it encrypted/decrypted. It can be applied to phys_addr_t, pgprotval_t or page table entry value. pgprot_encrypted() and pgprot_decrypted() reimplemented using new helpers. The implementation will be extended to cover TDX. pgprot_decrypted() is used by drivers (i915, virtio_gpu, vfio). cc_mkdec() called by pgprot_decrypted(). Export cc_mkdec(). Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com> Link: https://lore.kernel.org/r/20220222185740.26228-5-kirill.shutemov@linux.intel.com
Diffstat (limited to 'arch/x86/include/asm/coco.h')
-rw-r--r--arch/x86/include/asm/coco.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/include/asm/coco.h b/arch/x86/include/asm/coco.h
index e49f9ddb6ae6..3d98c3a60d34 100644
--- a/arch/x86/include/asm/coco.h
+++ b/arch/x86/include/asm/coco.h
@@ -2,6 +2,8 @@
#ifndef _ASM_X86_COCO_H
#define _ASM_X86_COCO_H
+#include <asm/types.h>
+
enum cc_vendor {
CC_VENDOR_NONE,
CC_VENDOR_AMD,
@@ -10,5 +12,21 @@ enum cc_vendor {
};
void cc_set_vendor(enum cc_vendor v);
+void cc_set_mask(u64 mask);
+
+#ifdef CONFIG_ARCH_HAS_CC_PLATFORM
+u64 cc_mkenc(u64 val);
+u64 cc_mkdec(u64 val);
+#else
+static inline u64 cc_mkenc(u64 val)
+{
+ return val;
+}
+
+static inline u64 cc_mkdec(u64 val)
+{
+ return val;
+}
+#endif
#endif /* _ASM_X86_COCO_H */