Add documentation for the newly defined firmware registers to save and
restore any vulnerability migitation status.
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
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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