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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2022-04-06 02:29:35 +0300 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2022-04-07 18:27:53 +0300 |
| commit | 7dbde7631629896b478bc5b1f4c3e52e6d518d12 (patch) | |
| tree | 1a7903f059095b77b8026e49d648e84d34310481 /arch/x86/coco/core.c | |
| parent | 9aa6ea69852c46e551f4180dce4208bd53df418c (diff) | |
| download | linux-7dbde7631629896b478bc5b1f4c3e52e6d518d12.tar.xz | |
x86/mm/cpa: Add support for TDX shared memory
Intel TDX protects guest memory from VMM access. Any memory that is
required for communication with the VMM must be explicitly shared.
It is a two-step process: the guest sets the shared bit in the page
table entry and notifies VMM about the change. The notification happens
using MapGPA hypercall.
Conversion back to private memory requires clearing the shared bit,
notifying VMM with MapGPA hypercall following with accepting the memory
with AcceptPage hypercall.
Provide a TDX version of x86_platform.guest.* callbacks. It makes
__set_memory_enc_pgtable() work right in TDX guest.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20220405232939.73860-27-kirill.shutemov@linux.intel.com
Diffstat (limited to 'arch/x86/coco/core.c')
| -rw-r--r-- | arch/x86/coco/core.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/coco/core.c b/arch/x86/coco/core.c index 70956f9d7c7e..9f74125c582d 100644 --- a/arch/x86/coco/core.c +++ b/arch/x86/coco/core.c @@ -21,6 +21,7 @@ static bool intel_cc_platform_has(enum cc_attr attr) switch (attr) { case CC_ATTR_GUEST_UNROLL_STRING_IO: case CC_ATTR_HOTPLUG_DISABLED: + case CC_ATTR_GUEST_MEM_ENCRYPT: return true; default: return false; |