Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include <asm/rwonce.h>
|
|
#include <asm/page.h>
|
|
#include <asm/skey.h>
|
|
|
|
int skey_regions_initialized;
|
|
|
|
static inline unsigned long load_real_address(unsigned long address)
|
|
{
|
|
unsigned long real;
|
|
|
|
asm volatile(
|
|
" lra %[real],0(%[address])"
|
|
: [real] "=d" (real)
|
|
: [address] "a" (address)
|
|
: "cc");
|
|
return real;
|
|
}
|
|
|
|
/*
|
|
* Initialize storage keys of registered memory regions with the
|
|
* default key. This is useful for code which is executed with a
|
|
* non-default access key.
|
|
*/
|
|
void __skey_regions_initialize(void)
|
|
{
|
|
unsigned long address, real;
|
|
struct skey_region *r, *end;
|
|
|
|
r = __skey_region_start;
|
|
end = __skey_region_end;
|
|
while (r < end) {
|
|
address = r->start & PAGE_MASK;
|
|
do {
|
|
real = load_real_address(address);
|
|
page_set_storage_key(real, PAGE_DEFAULT_KEY, 1);
|
|
address += PAGE_SIZE;
|
|
} while (address < r->end);
|
|
r++;
|
|
}
|
|
/*
|
|
* Make sure storage keys are initialized before
|
|
* skey_regions_initialized is changed.
|
|
*/
|
|
barrier();
|
|
WRITE_ONCE(skey_regions_initialized, 1);
|
|
}
|