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KVM: arm64: Allow ARM64_PTR_AUTH when ARM64_VHE=n

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We currently prevent PtrAuth from even being built if KVM is selected,
but VHE isn't. It is a bit of a pointless restriction, since we also
check this at run time (rejecting the enabling of PtrAuth for the
vcpu if we're not running with VHE).

Just drop this apparently useless restriction.

Acked-by: Andrew Scull <ascull@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2020-06-11 12:18:58 +01:00
parent 4a95a1b20d
commit dfb0589c8f
1 changed files with 1 additions and 3 deletions
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4
arch/arm64/Kconfig
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@ -1516,7 +1516,6 @@ menu "ARMv8.3 architectural features"
config ARM64_PTR_AUTH config ARM64_PTR_AUTH
bool "Enable support for pointer authentication" bool "Enable support for pointer authentication"
default y default y
depends on !KVM || ARM64_VHE
depends on (CC_HAS_SIGN_RETURN_ADDRESS || CC_HAS_BRANCH_PROT_PAC_RET) && AS_HAS_PAC depends on (CC_HAS_SIGN_RETURN_ADDRESS || CC_HAS_BRANCH_PROT_PAC_RET) && AS_HAS_PAC
# GCC 9.1 and later inserts a .note.gnu.property section note for PAC # GCC 9.1 and later inserts a .note.gnu.property section note for PAC
# which is only understood by binutils starting with version 2.33.1. # which is only understood by binutils starting with version 2.33.1.
@ -1543,8 +1542,7 @@ config ARM64_PTR_AUTH
The feature is detected at runtime. If the feature is not present in The feature is detected at runtime. If the feature is not present in
hardware it will not be advertised to userspace/KVM guest nor will it hardware it will not be advertised to userspace/KVM guest nor will it
be enabled. However, KVM guest also require VHE mode and hence be enabled.
CONFIG_ARM64_VHE=y option to use this feature.
If the feature is present on the boot CPU but not on a late CPU, then If the feature is present on the boot CPU but not on a late CPU, then
the late CPU will be parked. Also, if the boot CPU does not have the late CPU will be parked. Also, if the boot CPU does not have