[PATCH v4 2/2] KVM: doc: add API documentation on the KVM_REG_ARM_WORKAROUNDS register
From: Andre Przywara <andre.przywara@arm.com>
Date: 2019-02-28 23:43:56
Also in:
kvm, kvmarm
Subsystem:
documentation, the rest · Maintainers:
Jonathan Corbet, Linus Torvalds
Add documentation for the newly defined firmware registers to save and restore any vulnerability migitation status. Signed-off-by: Andre Przywara <andre.przywara@arm.com> --- Documentation/virtual/kvm/arm/psci.txt | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/Documentation/virtual/kvm/arm/psci.txt b/Documentation/virtual/kvm/arm/psci.txt
index aafdab887b04..1ed0f0515cd8 100644
--- a/Documentation/virtual/kvm/arm/psci.txt
+++ b/Documentation/virtual/kvm/arm/psci.txt@@ -28,3 +28,28 @@ The following register is defined: - Allows any PSCI version implemented by KVM and compatible with v0.2 to be set with SET_ONE_REG - Affects the whole VM (even if the register view is per-vcpu) + +* KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1: + Holds the state of the firmware controlled workaround to mitigate + CVE-2017-5715, as described under SMCCC_ARCH_WORKAROUND_1 in [1]. + Accepted values are: + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL: Workaround not available. + The mitigation status for the guest is unknown. + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_AVAIL: The workaround HVC call is + available to the guest and required for the mitigation. + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_UNAFFECTED: The workaround HVC call + is available to the guest, but it is not needed on this VCPU. + +* KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2: + Holds the state of the firmware controlled workaround to mitigate + CVE-2018-3639, as described under SMCCC_ARCH_WORKAROUND_2 in [1]. + Accepted values are: + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL: Workaround not available. + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNKNOWN: Workaround state unknown. + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL: Workaround available, and can + be disabled by a vCPU. If KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED is + set, it is active for this vCPU. + KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNAFFECTED: Workaround always active + or not needed. + +[1] https://developer.arm.com/-/media/developer/pdf/ARM_DEN_0070A_Firmware_interfaces_for_mitigating_CVE-2017-5715.pdf
--
2.17.1
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