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KVM: arm64: Simplify handling of ARCH_WORKAROUND_2

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Owing to the fact that the host kernel is always mitigated, we can
drastically simplify the WA2 handling by keeping the mitigation
state ON when entering the guest. This means the guest is either
unaffected or not mitigated.

This results in a nice simplification of the mitigation space,
and the removal of a lot of code that was never really used anyway.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Marc Zyngier
2020-09-18 12:25:40 +01:00
committed by Will Deacon
parent c28762070c
commit 29e8910a56
14 changed files with 41 additions and 163 deletions
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9
arch/arm64/include/uapi/asm/kvm.h
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@@ -242,6 +242,15 @@ struct kvm_vcpu_events {
#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL 0
#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_AVAIL 1
#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_REQUIRED 2
/*
* Only two states can be presented by the host kernel:
* - NOT_REQUIRED: the guest doesn't need to do anything
* - NOT_AVAIL: the guest isn't mitigated (it can still use SSBS if available)
*
* All the other values are deprecated. The host still accepts all
* values (they are ABI), but will narrow them to the above two.
*/
#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2 KVM_REG_ARM_FW_REG(2)
#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL 0
#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNKNOWN 1