diff options
| author | Tom Lendacky <thomas.lendacky@amd.com> | 2017-10-20 09:30:52 -0500 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-11-07 15:35:58 +0100 |
| commit | 0e4c12b45aa88e74fdda117896d2b61c4e510cb9 (patch) | |
| tree | 9007109ad9055fd3b23d6ba2d1f0b63e8421337e /kernel | |
| parent | 1d2e733b13b450e5854f4a8f8efcd77fa7362d62 (diff) | |
x86/mm, resource: Use PAGE_KERNEL protection for ioremap of memory pages
In order for memory pages to be properly mapped when SEV is active, it's
necessary to use the PAGE_KERNEL protection attribute as the base
protection. This ensures that memory mapping of, e.g. ACPI tables,
receives the proper mapping attributes.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Tested-by: Borislav Petkov <bp@suse.de>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: kvm@vger.kernel.org
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Link: https://lkml.kernel.org/r/20171020143059.3291-11-brijesh.singh@amd.com
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/resource.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/resource.c b/kernel/resource.c index 8430042fa77b..54ba6de3757c 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -397,6 +397,8 @@ static int find_next_iomem_res(struct resource *res, unsigned long desc, res->start = p->start; if (res->end > p->end) res->end = p->end; + res->flags = p->flags; + res->desc = p->desc; return 0; } @@ -467,6 +469,23 @@ int walk_system_ram_res(u64 start, u64 end, void *arg, arg, func); } +/* + * This function calls the @func callback against all memory ranges, which + * are ranges marked as IORESOURCE_MEM and IORESOUCE_BUSY. + */ +int walk_mem_res(u64 start, u64 end, void *arg, + int (*func)(struct resource *, void *)) +{ + struct resource res; + + res.start = start; + res.end = end; + res.flags = IORESOURCE_MEM | IORESOURCE_BUSY; + + return __walk_iomem_res_desc(&res, IORES_DESC_NONE, true, + arg, func); +} + #if !defined(CONFIG_ARCH_HAS_WALK_MEMORY) /* |