xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

fs/core/vmcore: Move sev_active() reference to x86 arch code

Browse Source 
Secure Encrypted Virtualization is an x86-specific feature, so it shouldn't
appear in generic kernel code because it forces non-x86 architectures to
define the sev_active() function, which doesn't make a lot of sense.

To solve this problem, add an x86 elfcorehdr_read() function to override
the generic weak implementation. To do that, it's necessary to make
read_from_oldmem() public so that it can be used outside of vmcore.c.

Also, remove the export for sev_active() since it's only used in files that
won't be built as modules.

Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Lianbo Jiang <lijiang@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190806044919.10622-6-bauerman@linux.ibm.com
This commit is contained in:
Thiago Jung Bauermann
2019-08-06 01:49:18 -03:00
committed by Michael Ellerman
parent 284e21fab2
commit ae7eb82a92
5 changed files with 23 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
fs/proc/vmcore.c
View File

@@ -104,9 +104,9 @@ static int pfn_is_ram(unsigned long pfn)
}
/* Reads a page from the oldmem device from given offset. */
static ssize_t read_from_oldmem(char *buf, size_t count,
u64 *ppos, int userbuf,
bool encrypted)
ssize_t read_from_oldmem(char *buf, size_t count,
u64 *ppos, int userbuf,
bool encrypted)
{
unsigned long pfn, offset;
size_t nr_bytes;
@@ -170,7 +170,7 @@ void __weak elfcorehdr_free(unsigned long long addr)
*/
ssize_t __weak elfcorehdr_read(char *buf, size_t count, u64 *ppos)
{
return read_from_oldmem(buf, count, ppos, 0, sev_active());
return read_from_oldmem(buf, count, ppos, 0, false);
}
/*