From: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel•org>
To: iommu@lists•linux.dev, linux-arm-kernel@lists•infradead.org,
linux-kernel@vger•kernel.org, linux-coco@lists•linux.dev
Cc: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel•org>,
Robin Murphy <robin.murphy@arm•com>,
Marek Szyprowski <m.szyprowski@samsung•com>,
Will Deacon <will@kernel•org>, Marc Zyngier <maz@kernel•org>,
Steven Price <steven.price@arm•com>,
Suzuki K Poulose <Suzuki.Poulose@arm•com>,
Catalin Marinas <catalin.marinas@arm•com>,
Jiri Pirko <jiri@resnulli•us>, Jason Gunthorpe <jgg@ziepe•ca>,
Mostafa Saleh <smostafa@google•com>,
Petr Tesarik <ptesarik@suse•com>,
Alexey Kardashevskiy <aik@amd•com>,
Dan Williams <dan.j.williams@intel•com>,
Xu Yilun <yilun.xu@linux•intel.com>,
linuxppc-dev@lists•ozlabs.org, linux-s390@vger•kernel.org,
Madhavan Srinivasan <maddy@linux•ibm.com>,
Michael Ellerman <mpe@ellerman•id.au>,
Nicholas Piggin <npiggin@gmail•com>,
"Christophe Leroy (CS GROUP)" <chleroy@kernel•org>,
Alexander Gordeev <agordeev@linux•ibm.com>,
Gerald Schaefer <gerald.schaefer@linux•ibm.com>,
Heiko Carstens <hca@linux•ibm.com>,
Vasily Gorbik <gor@linux•ibm.com>,
Christian Borntraeger <borntraeger@linux•ibm.com>,
Sven Schnelle <svens@linux•ibm.com>,
x86@kernel•org, Halil Pasic <pasic@linux•ibm.com>,
Matthew Rosato <mjrosato@linux•ibm.com>,
Jaehoon Kim <jhkim@linux•ibm.com>
Subject: [PATCH v5 02/20] [DO NOT MERGE] s390: Expose protected virtualization through cc_platform_has()
Date: Fri, 22 May 2026 09:57:57 +0530 [thread overview]
Message-ID: <20260522042815.370873-3-aneesh.kumar@kernel.org> (raw)
In-Reply-To: <20260522042815.370873-1-aneesh.kumar@kernel.org>
Protected virtualization guests use memory encryption, so advertise that to
the rest of the kernel through cc_platform_has(CC_ATTR_MEM_ENCRYPT).
s390 already forces DMA mappings to be unencrypted for protected
virtualization guests through force_dma_unencrypted(). Add
ARCH_HAS_CC_PLATFORM and provide the matching cc_platform_has()
implementation
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel•org>
---
Cc: Halil Pasic <pasic@linux•ibm.com>
Cc: Matthew Rosato <mjrosato@linux•ibm.com>
Cc: Jaehoon Kim <jhkim@linux•ibm.com>
---
arch/s390/Kconfig | 1 +
arch/s390/mm/init.c | 14 ++++++++++++++
2 files changed, 15 insertions(+)
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index ecbcbb781e40..9b5e6029e043 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -87,6 +87,7 @@ config S390
select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
select ARCH_HAS_CC_CAN_LINK
+ select ARCH_HAS_CC_PLATFORM
select ARCH_HAS_CPU_FINALIZE_INIT
select ARCH_HAS_CURRENT_STACK_POINTER
select ARCH_HAS_DEBUG_VIRTUAL
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 1f72efc2a579..ad3c6d92b801 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -50,6 +50,7 @@
#include <linux/virtio_anchor.h>
#include <linux/virtio_config.h>
#include <linux/execmem.h>
+#include <linux/cc_platform.h>
pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir");
pgd_t invalid_pg_dir[PTRS_PER_PGD] __section(".bss..invalid_pg_dir");
@@ -140,6 +141,19 @@ bool force_dma_unencrypted(struct device *dev)
return is_prot_virt_guest();
}
+
+bool cc_platform_has(enum cc_attr attr)
+{
+ switch (attr) {
+ case CC_ATTR_MEM_ENCRYPT:
+ return is_prot_virt_guest();
+
+ default:
+ return false;
+ }
+}
+EXPORT_SYMBOL_GPL(cc_platform_has);
+
/* protected virtualization */
static void __init pv_init(void)
{
--
2.43.0
next prev parent reply other threads:[~2026-05-22 4:29 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-22 4:27 [PATCH v5 00/20] dma-mapping: Use DMA_ATTR_CC_SHARED through direct, pool and swiotlb paths Aneesh Kumar K.V (Arm)
2026-05-22 4:27 ` [PATCH v5 01/20] [DO NOT MERGE] arm64/coco: Add pKVM as a CC platform Aneesh Kumar K.V (Arm)
2026-05-22 4:27 ` Aneesh Kumar K.V (Arm) [this message]
2026-05-22 15:35 ` [PATCH v5 02/20] [DO NOT MERGE] s390: Expose protected virtualization through cc_platform_has() JAEHOON KIM
2026-05-22 4:27 ` [PATCH v5 03/20] dma-direct: swiotlb: handle swiotlb alloc/free outside __dma_direct_alloc_pages Aneesh Kumar K.V (Arm)
2026-05-22 4:27 ` [PATCH v5 04/20] dma-direct: use DMA_ATTR_CC_SHARED in alloc/free paths Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 05/20] dma-pool: track decrypted atomic pools and select them via attrs Aneesh Kumar K.V (Arm)
2026-05-28 18:29 ` Michael Kelley
2026-06-02 6:05 ` Aneesh Kumar K.V
2026-06-02 14:24 ` Michael Kelley
2026-06-03 0:54 ` Jason Gunthorpe
2026-06-04 14:05 ` Michael Kelley
2026-06-04 14:30 ` Jason Gunthorpe
2026-06-04 14:57 ` Aneesh Kumar K.V
2026-06-04 16:18 ` Michael Kelley
2026-06-04 18:24 ` Jason Gunthorpe
2026-05-22 4:28 ` [PATCH v5 06/20] dma: swiotlb: pass mapping attributes by reference Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 07/20] dma: swiotlb: track pool encryption state and honor DMA_ATTR_CC_SHARED Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 08/20] dma-mapping: make dma_pgprot() " Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 09/20] dma-direct: pass attrs to dma_capable() for DMA_ATTR_CC_SHARED checks Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 10/20] dma-direct: make dma_direct_map_phys() honor DMA_ATTR_CC_SHARED Aneesh Kumar K.V (Arm)
2026-05-26 2:56 ` Michael Kelley
2026-05-26 15:39 ` Jason Gunthorpe
2026-06-02 6:10 ` Aneesh Kumar K.V
2026-05-22 4:28 ` [PATCH v5 11/20] dma-direct: set decrypted flag for remapped DMA allocations Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 12/20] dma-direct: select DMA address encoding from DMA_ATTR_CC_SHARED Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 13/20] dma-pool: fix page leak in atomic_pool_expand() cleanup Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 14/20] dma-direct: rename ret to cpu_addr in alloc helpers Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 15/20] dma-direct: return struct page from dma_direct_alloc_from_pool() Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 16/20] iommu/dma: Check atomic pool allocation result directly Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 17/20] dma: swiotlb: free dynamic pools from process context Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 18/20] dma: swiotlb: handle set_memory_decrypted() failures Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 19/20] dma: free atomic pool pages by physical address Aneesh Kumar K.V (Arm)
2026-05-22 4:28 ` [PATCH v5 20/20] swiotlb: Preserve allocation virtual address for dynamic pools Aneesh Kumar K.V (Arm)
2026-05-26 4:30 ` [PATCH v5 00/20] dma-mapping: Use DMA_ATTR_CC_SHARED through direct, pool and swiotlb paths Michael Kelley
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