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author | Tom Lendacky <thomas.lendacky@amd.com> | 2017-07-17 16:10:00 -0500 |
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committer | Ingo Molnar <mingo@kernel.org> | 2017-07-18 11:37:58 +0200 |
commit | f7750a79568788473c5e8092ee58a52248f34329 (patch) | |
tree | 7e179f9a50f488b5a395a8989a7ab9d9981851ca /arch/x86/kernel/kdebugfs.c | |
parent | aac7b79eea6118dee3da9b99dcd564471672806d (diff) | |
download | linux-stable-f7750a79568788473c5e8092ee58a52248f34329.tar.gz linux-stable-f7750a79568788473c5e8092ee58a52248f34329.tar.bz2 linux-stable-f7750a79568788473c5e8092ee58a52248f34329.zip |
x86, mpparse, x86/acpi, x86/PCI, x86/dmi, SFI: Use memremap() for RAM mappings
The ioremap() function is intended for mapping MMIO. For RAM, the
memremap() function should be used. Convert calls from ioremap() to
memremap() when re-mapping RAM.
This will be used later by SME to control how the encryption mask is
applied to memory mappings, with certain memory locations being mapped
decrypted vs encrypted.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Toshimitsu Kani <toshi.kani@hpe.com>
Cc: kasan-dev@googlegroups.com
Cc: kvm@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: linux-efi@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/b13fccb9abbd547a7eef7b1fdfc223431b211c88.1500319216.git.thomas.lendacky@amd.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/kdebugfs.c')
-rw-r--r-- | arch/x86/kernel/kdebugfs.c | 34 |
1 files changed, 11 insertions, 23 deletions
diff --git a/arch/x86/kernel/kdebugfs.c b/arch/x86/kernel/kdebugfs.c index 38b64587b31b..fd6f8fbbe6f2 100644 --- a/arch/x86/kernel/kdebugfs.c +++ b/arch/x86/kernel/kdebugfs.c @@ -33,7 +33,6 @@ static ssize_t setup_data_read(struct file *file, char __user *user_buf, struct setup_data_node *node = file->private_data; unsigned long remain; loff_t pos = *ppos; - struct page *pg; void *p; u64 pa; @@ -47,18 +46,13 @@ static ssize_t setup_data_read(struct file *file, char __user *user_buf, count = node->len - pos; pa = node->paddr + sizeof(struct setup_data) + pos; - pg = pfn_to_page((pa + count - 1) >> PAGE_SHIFT); - if (PageHighMem(pg)) { - p = ioremap_cache(pa, count); - if (!p) - return -ENXIO; - } else - p = __va(pa); + p = memremap(pa, count, MEMREMAP_WB); + if (!p) + return -ENOMEM; remain = copy_to_user(user_buf, p, count); - if (PageHighMem(pg)) - iounmap(p); + memunmap(p); if (remain) return -EFAULT; @@ -109,7 +103,6 @@ static int __init create_setup_data_nodes(struct dentry *parent) struct setup_data *data; int error; struct dentry *d; - struct page *pg; u64 pa_data; int no = 0; @@ -126,16 +119,12 @@ static int __init create_setup_data_nodes(struct dentry *parent) goto err_dir; } - pg = pfn_to_page((pa_data+sizeof(*data)-1) >> PAGE_SHIFT); - if (PageHighMem(pg)) { - data = ioremap_cache(pa_data, sizeof(*data)); - if (!data) { - kfree(node); - error = -ENXIO; - goto err_dir; - } - } else - data = __va(pa_data); + data = memremap(pa_data, sizeof(*data), MEMREMAP_WB); + if (!data) { + kfree(node); + error = -ENOMEM; + goto err_dir; + } node->paddr = pa_data; node->type = data->type; @@ -143,8 +132,7 @@ static int __init create_setup_data_nodes(struct dentry *parent) error = create_setup_data_node(d, no, node); pa_data = data->next; - if (PageHighMem(pg)) - iounmap(data); + memunmap(data); if (error) goto err_dir; no++; |