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KVM: arm64: Allow SMCCC_ARCH_WORKAROUND_3 to be discovered and migrated

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commit a5905d6af492ee6a4a2205f0d550b3f931b03d03 upstream.

KVM allows the guest to discover whether the ARCH_WORKAROUND SMCCC are
implemented, and to preserve that state during migration through its
firmware register interface.

Add the necessary boiler plate for SMCCC_ARCH_WORKAROUND_3.

Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
James Morse
2021-12-10 11:16:18 +00:00
committed by Greg Kroah-Hartman
parent e192c8baa6
commit 38c26bdb3c
3 changed files with 34 additions and 1 deletions
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12
arch/arm64/kvm/hypercalls.c
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@@ -58,6 +58,18 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
break;
}
break;
case ARM_SMCCC_ARCH_WORKAROUND_3:
switch (arm64_get_spectre_bhb_state()) {
case SPECTRE_VULNERABLE:
break;
case SPECTRE_MITIGATED:
val = SMCCC_RET_SUCCESS;
break;
case SPECTRE_UNAFFECTED:
val = SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED;
break;
}
break;
case ARM_SMCCC_HV_PV_TIME_FEATURES:
val = SMCCC_RET_SUCCESS;
break;