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Commit ac60602a authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'dma-mapping-5.3-1' of git://git.infradead.org/users/hch/dma-mapping 

Pull dma-mapping fixes from Christoph Hellwig:
 "Fix various regressions:

   - force unencrypted dma-coherent buffers if encryption bit can't fit
     into the dma coherent mask (Tom Lendacky)

   - avoid limiting request size if swiotlb is not used (me)

   - fix swiotlb handling in dma_direct_sync_sg_for_cpu/device (Fugang
     Duan)"

* tag 'dma-mapping-5.3-1' of git://git.infradead.org/users/hch/dma-mapping:
  dma-direct: correct the physical addr in dma_direct_sync_sg_for_cpu/device
  dma-direct: only limit the mapping size if swiotlb could be used
  dma-mapping: add a dma_addressing_limited helper
  dma-direct: Force unencrypted DMA under SME for certain DMA masks
parents c6dd78fc 449fa54d

arch/s390/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -189,6 +189,7 @@ config S390 
	select VIRT_CPU_ACCOUNTING

	select ARCH_HAS_SCALED_CPUTIME

	select HAVE_NMI

	select ARCH_HAS_FORCE_DMA_UNENCRYPTED

	select SWIOTLB

	select GENERIC_ALLOCATOR

arch/s390/mm/init.c

+6 −1
Original line number Diff line number Diff line
@@ -30,7 +30,7 @@ 
#include <linux/export.h>

#include <linux/cma.h>

#include <linux/gfp.h>

#include <linux/dma-mapping.h>

#include <linux/dma-direct.h>

#include <asm/processor.h>

#include <linux/uaccess.h>

#include <asm/pgtable.h>
@@ -161,6 +161,11 @@ bool sev_active(void) 
	return is_prot_virt_guest();

}



bool force_dma_unencrypted(struct device *dev)

{

	return sev_active();

}



/* protected virtualization */

static void pv_init(void)

{

arch/x86/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -1526,6 +1526,7 @@ config AMD_MEM_ENCRYPT 
	depends on X86_64 && CPU_SUP_AMD

	select DYNAMIC_PHYSICAL_MASK

	select ARCH_USE_MEMREMAP_PROT

	select ARCH_HAS_FORCE_DMA_UNENCRYPTED

	---help---

	  Say yes to enable support for the encryption of system memory.

	  This requires an AMD processor that supports Secure Memory

arch/x86/mm/mem_encrypt.c

+30 −0
Original line number Diff line number Diff line
@@ -15,6 +15,10 @@ 
#include <linux/dma-direct.h>

#include <linux/swiotlb.h>

#include <linux/mem_encrypt.h>

#include <linux/device.h>

#include <linux/kernel.h>

#include <linux/bitops.h>

#include <linux/dma-mapping.h>



#include <asm/tlbflush.h>

#include <asm/fixmap.h>
@@ -348,6 +352,32 @@ bool sev_active(void) 
}

EXPORT_SYMBOL(sev_active);



/* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */

bool force_dma_unencrypted(struct device *dev)

{

	/*

	 * For SEV, all DMA must be to unencrypted addresses.

	 */

	if (sev_active())

		return true;



	/*

	 * For SME, all DMA must be to unencrypted addresses if the

	 * device does not support DMA to addresses that include the

	 * encryption mask.

	 */

	if (sme_active()) {

		u64 dma_enc_mask = DMA_BIT_MASK(__ffs64(sme_me_mask));

		u64 dma_dev_mask = min_not_zero(dev->coherent_dma_mask,

						dev->bus_dma_mask);



		if (dma_dev_mask <= dma_enc_mask)

			return true;

	}



	return false;

}



/* Architecture __weak replacement functions */

void __init mem_encrypt_free_decrypted_mem(void)

{

include/linux/dma-direct.h

+9 −0
Original line number Diff line number Diff line
@@ -32,6 +32,15 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) 
}

#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */



#ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED

bool force_dma_unencrypted(struct device *dev);

#else

static inline bool force_dma_unencrypted(struct device *dev)

{

	return false;

}

#endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */



/*

 * If memory encryption is supported, phys_to_dma will set the memory encryption

 * bit in the DMA address, and dma_to_phys will clear it.  The raw __phys_to_dma