From: Steven Price <steven.price@xxxxxxx> Sent: Wednesday, June 5, 2024 2:30 AM > > From: Suzuki K Poulose <suzuki.poulose@xxxxxxx> > > Device mappings (currently) need to be emulated by the VMM so must be > mapped shared with the host. > > Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx> > Signed-off-by: Steven Price <steven.price@xxxxxxx> > --- > arch/arm64/include/asm/pgtable.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h > index 11d614d83317..c986fde262c0 100644 > --- a/arch/arm64/include/asm/pgtable.h > +++ b/arch/arm64/include/asm/pgtable.h > @@ -644,7 +644,7 @@ static inline void set_pud_at(struct mm_struct *mm, unsigned long addr, > #define pgprot_writecombine(prot) \ > __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN) > #define pgprot_device(prot) \ > - __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_PXN | PTE_UXN) > + __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_PXN | PTE_UXN | PROT_NS_SHARED) > #define pgprot_tagged(prot) \ > __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_TAGGED)) > #define pgprot_mhp pgprot_tagged In v2 of the patches, Catalin raised a question about the need for pgprot_decrypted(). What was concluded? It still looks to me like pgprot_decrypted() and prot_encrypted() are needed, by dma_direct_mmap() and remap_oldmem_pfn_range(), respectively. Also, assuming Hyper-V supports CCA at some point, the Linux guest drivers for Hyper-V need pgprot_decrypted() in hv_ringbuffer_init(). Michael
