[RFC PATCH 03/11] powerpc/svm: Add memory conversion (shared/secure) helper functions
From: Thiago Jung Bauermann <hidden>
Date: 2018-08-24 03:00:16
Also in:
linux-iommu, lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
From: Anshuman Khandual <redacted> Add the following helper functions to convert PAGE_SIZE aligned memory buffers as shared or secure (i.e., accessible to the hypervisor or not) via Ultravisor calls. 1. mem_convert_shared(unsigned long pfn, unsigned long npages) 2. mem_convert_secure(unsigned long pfn, unsigned long npages) Signed-off-by: Anshuman Khandual <redacted> Signed-off-by: Thiago Jung Bauermann <redacted> --- arch/powerpc/include/asm/svm.h | 3 +++ arch/powerpc/kernel/Makefile | 1 + arch/powerpc/kernel/svm.c | 33 +++++++++++++++++++++++++++++++++ 3 files changed, 37 insertions(+)
diff --git a/arch/powerpc/include/asm/svm.h b/arch/powerpc/include/asm/svm.h
index 6f89e5d6d37f..95d69e472e52 100644
--- a/arch/powerpc/include/asm/svm.h
+++ b/arch/powerpc/include/asm/svm.h@@ -13,6 +13,9 @@ static bool is_svm_platform(void) { return mfmsr() & MSR_S; } + +extern void mem_convert_shared(unsigned long pfn, unsigned long npages); +extern void mem_convert_secure(unsigned long pfn, unsigned long npages); #else static inline bool is_svm_platform(void) {
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 2b4c40b255e4..98780b4e924c 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile@@ -113,6 +113,7 @@ ifeq ($(CONFIG_HAVE_IMA_KEXEC)$(CONFIG_IMA),yy) obj-y += ima_kexec.o endif +obj-$(CONFIG_PPC_SVM) += svm.o obj-$(CONFIG_AUDIT) += audit.o obj64-$(CONFIG_AUDIT) += compat_audit.o
diff --git a/arch/powerpc/kernel/svm.c b/arch/powerpc/kernel/svm.c
new file mode 100644
index 000000000000..37437cf92df5
--- /dev/null
+++ b/arch/powerpc/kernel/svm.c@@ -0,0 +1,33 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Secure VM platform + * + * Copyright 2018 IBM Corporation + * Author: Anshuman Khandual <khandual@linux.vnet.ibm.com> + */ + +#include <linux/mm.h> + +void mem_convert_shared(unsigned long pfn, unsigned long npages) +{ + if (!pfn_valid(pfn)) + return; + + /* + * FIXME: Insert real UV call when ready + * + * ucall_convert_shared(paddr, size) + */ +} + +void mem_convert_secure(unsigned long pfn, unsigned long npages) +{ + if (!pfn_valid(pfn)) + return; + + /* + * FIXME: Insert real UV call when ready + * + * ucall_convert_secure(paddr, size) + */ +}