From: "Kirill A. Shutemov" <kirill.shute...@linux.intel.com>
All ioremap()ed paged that are not backed by normal memory (NONE or RESERVED) have to be mapped as shared. Reuse the infrastructure we have for AMD SEV. Signed-off-by: Kirill A. Shutemov <kirill.shute...@linux.intel.com> Reviewed-by: Andi Kleen <a...@linux.intel.com> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppusw...@linux.intel.com> --- arch/x86/include/asm/pgtable.h | 3 +++ arch/x86/mm/ioremap.c | 8 +++++--- 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index a02c67291cfc..a82bab48379e 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -21,6 +21,9 @@ #define pgprot_encrypted(prot) __pgprot(__sme_set(pgprot_val(prot))) #define pgprot_decrypted(prot) __pgprot(__sme_clr(pgprot_val(prot))) +/* Make the page accesable by VMM */ +#define pgprot_tdx_shared(prot) __pgprot(pgprot_val(prot) | tdx_shared_mask()) + #ifndef __ASSEMBLY__ #include <asm/x86_init.h> #include <asm/fpu/xstate.h> diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 9e5ccc56f8e0..a0ba760866d4 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -87,12 +87,12 @@ static unsigned int __ioremap_check_ram(struct resource *res) } /* - * In a SEV guest, NONE and RESERVED should not be mapped encrypted because - * there the whole memory is already encrypted. + * In a SEV or TDX guest, NONE and RESERVED should not be mapped encrypted (or + * private in TDX case) because there the whole memory is already encrypted. */ static unsigned int __ioremap_check_encrypted(struct resource *res) { - if (!sev_active()) + if (!sev_active() && !is_tdx_guest()) return 0; switch (res->desc) { @@ -244,6 +244,8 @@ __ioremap_caller(resource_size_t phys_addr, unsigned long size, prot = PAGE_KERNEL_IO; if ((io_desc.flags & IORES_MAP_ENCRYPTED) || encrypted) prot = pgprot_encrypted(prot); + else if (is_tdx_guest()) + prot = pgprot_tdx_shared(prot); switch (pcm) { case _PAGE_CACHE_MODE_UC: -- 2.25.1