linux_dsm_epyc7002/arch
Will Deacon 5717fe5ab3 arm64: cpufeature: Don't treat granule sizes as strict
If a CPU doesn't support the page size for which the kernel is
configured, then we will complain and refuse to bring it online. For
secondary CPUs (and the boot CPU on a system booting with EFI), we will
also print an error identifying the mismatch.

Consequently, the only time that the cpufeature code can detect a
granule size mismatch is for a granule other than the one that is
currently being used. Although we would rather such systems didn't
exist, we've unfortunately lost that battle and Kevin reports that
on his amlogic S922X (odroid-n2 board) we end up warning and taining
with defconfig because 16k pages are not supported by all of the CPUs.

In such a situation, we don't actually care about the feature mismatch,
particularly now that KVM only exposes the sanitised view of the CPU
registers (commit 93390c0a1b - "arm64: KVM: Hide unsupported AArch64
CPU features from guests"). Treat the granule fields as non-strict and
let Kevin run without a tainted kernel.

Cc: Marc Zyngier <maz@kernel.org>
Reported-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
[catalin.marinas@arm.com: changelog updated with KVM sanitised regs commit]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2019-08-13 12:56:35 +01:00
..
alpha Merge branch 'akpm' (patches from Andrew) 2019-07-17 08:58:04 -07:00
arc Merge branch 'akpm' (patches from Andrew) 2019-07-17 08:58:04 -07:00
arm add swiotlb support to arm 2019-08-02 08:44:33 -07:00
arm64 arm64: cpufeature: Don't treat granule sizes as strict 2019-08-13 12:56:35 +01:00
c6x Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu 2019-07-10 21:42:03 -07:00
csky treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers 2019-07-25 11:05:10 +02:00
h8300 h8300 update for 5.3 2019-07-17 09:36:38 -07:00
hexagon hexagon: switch to generic version of pte allocation 2019-07-21 09:53:00 -07:00
ia64 Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
m68k arch: mark syscall number 435 reserved for clone3 2019-07-15 00:39:33 +02:00
microblaze clone3-v5.3 2019-07-11 10:09:44 -07:00
mips page flags: prioritize kasan bits over last-cpuid 2019-08-03 07:02:01 -07:00
nds32 treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers 2019-07-25 11:05:10 +02:00
nios2 nios2 update for v5.3-rc1 2019-07-12 15:38:05 -07:00
openrisc dma-mapping updates for Linux 5.3 2019-07-12 15:13:55 -07:00
parisc parisc: Add archclean Makefile target 2019-08-01 14:20:55 +02:00
powerpc powerpc/kasan: fix early boot failure on PPC32 2019-07-31 22:02:52 +10:00
riscv riscv: defconfig: align RV64 defconfig to the output of "make savedefconfig" 2019-07-31 12:26:10 -07:00
s390 s390/mm: add fallthrough annotations 2019-07-29 18:05:03 +02:00
sh treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers 2019-07-25 11:05:10 +02:00
sparc treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers 2019-07-25 11:05:10 +02:00
um This pull request contains the following changes for UML: 2019-07-14 17:17:34 -07:00
unicore32 Kconfig updates for v5.3 2019-07-12 16:06:27 -07:00
x86 x86/vdso/32: Use 32bit syscall fallback 2019-07-31 00:09:10 +02:00
xtensa xtensa: fix build for cores with coprocessors 2019-07-24 17:44:42 -07:00
.gitignore
Kconfig Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-20 10:33:44 -07:00