diff options
| 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 08:27:53 -0700 |
| commit | 7dbde7631629896b478bc5b1f4c3e52e6d518d12 (patch) | |
| tree | 1a7903f059095b77b8026e49d648e84d34310481 /arch/x86/kernel/traps.c | |
| parent | 9aa6ea69852c46e551f4180dce4208bd53df418c (diff) | |
| download | linux-stable-7dbde7631629896b478bc5b1f4c3e52e6d518d12.tar.gz linux-stable-7dbde7631629896b478bc5b1f4c3e52e6d518d12.tar.bz2 linux-stable-7dbde7631629896b478bc5b1f4c3e52e6d518d12.zip | |
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/kernel/traps.c')
| -rw-r--r-- | arch/x86/kernel/traps.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index f9fb6530338f..a4e2efde5d1f 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -1378,7 +1378,7 @@ static void ve_raise_fault(struct pt_regs *regs, long error_code) * * In the settings that Linux will run in, virtualization exceptions are * never generated on accesses to normal, TD-private memory that has been - * accepted. + * accepted (by BIOS or with tdx_enc_status_changed()). * * Syscall entry code has a critical window where the kernel stack is not * yet set up. Any exception in this window leads to hard to debug issues |