Ard Biesheuvel 88053ec8cb arm64: mm: limit linear region to 51 bits for KVM in nVHE mode ... KVM in nVHE mode divides up its VA space into two equal halves, and picks the half that does not conflict with the HYP ID map to map its linear region. This worked fine when the kernel's linear map itself was guaranteed to cover precisely as many bits of VA space, but this was changed by commit f4693c2716 ("arm64: mm: extend linear region for 52-bit VA configurations"). The result is that, depending on the placement of the ID map, kernel-VA to hyp-VA translations may produce addresses that either conflict with other HYP mappings (including the ID map itself) or generate addresses outside of the 52-bit addressable range, neither of which is likely to lead to anything useful. Given that 52-bit capable cores are guaranteed to implement VHE, this only affects configurations such as pKVM where we opt into non-VHE mode even if the hardware is VHE capable. So just for these configurations, let's limit the kernel linear map to 51 bits and work around the problem. Fixes: f4693c2716 ("arm64: mm: extend linear region for 52-bit VA configurations") Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20210826165613.60774-1-ardb@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2021-09-09 18:02:08 +01:00
..
boot	Merge remote-tracking branch 'tip/sched/arm64' into for-next/core	2021-08-31 09:10:00 +01:00
configs	Additional Qualcomm ARM64 defconfig udpate for v5.14	2021-06-23 19:01:58 -07:00
crypto	crypto: arm64 - use a pattern rule for generating *.S files	2021-05-14 19:07:54 +08:00
include	Merge remote-tracking branch 'tip/sched/arm64' into for-next/core	2021-08-31 09:10:00 +01:00
kernel	Merge remote-tracking branch 'tip/sched/arm64' into for-next/core	2021-08-31 09:10:00 +01:00
kvm	KVM: arm64: Fix race when enabling KVM_ARM_CAP_MTE	2021-07-29 17:34:01 +01:00
lib	arm64: use __func__ to get function name in pr_err	2021-07-30 16:26:16 +01:00
mm	arm64: mm: limit linear region to 51 bits for KVM in nVHE mode	2021-09-09 18:02:08 +01:00
net	bpf: Introduce BPF nospec instruction for mitigating Spectre v4	2021-07-29 00:20:56 +02:00
tools	arm64: Allow mismatched 32-bit EL0 support	2021-06-11 13:25:40 +01:00
xen
Kbuild	bpf: Fix BPF_JIT kconfig symbol dependency	2021-05-20 23:48:37 +02:00
Kconfig	arm64: fix the doc of RANDOMIZE_MODULE_REGION_FULL	2021-08-03 10:36:42 +01:00
Kconfig.debug
Kconfig.platforms	Merge branch 'arm/fixes' into arm/soc	2021-07-09 10:46:02 -07:00
Makefile	Merge remote-tracking branch 'tip/sched/arm64' into for-next/core	2021-08-31 09:10:00 +01:00