diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2022-04-06 02:29:34 +0300 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2022-04-07 08:27:53 -0700 |
| commit | 9aa6ea69852c46e551f4180dce4208bd53df418c (patch) | |
| tree | 5cdd8678e9e9376c1a04169d7670b073e333eee9 /arch/x86/coco/tdx/tdx.c | |
| parent | bae1a962ac2c5e6be08319ff3f7d6df542584fce (diff) | |
x86/tdx: Make pages shared in ioremap()
In TDX guests, guest memory is protected from host access. If a guest
performs I/O, it needs to explicitly share the I/O memory with the host.
Make all ioremap()ed pages that are not backed by normal memory
(IORES_DESC_NONE or IORES_DESC_RESERVED) mapped as shared.
The permissions in PAGE_KERNEL_IO already work for "decrypted" memory
on AMD SEV/SME systems. That means that they have no need to make a
pgprot_decrypted() call.
TDX guests, on the other hand, _need_ change to PAGE_KERNEL_IO for
"decrypted" mappings. Add a pgprot_decrypted() for TDX.
Co-developed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20220405232939.73860-26-kirill.shutemov@linux.intel.com
Diffstat (limited to 'arch/x86/coco/tdx/tdx.c')
0 files changed, 0 insertions, 0 deletions