On 28/02/2019 23:43, Andre Przywara wrote: > Add documentation for the newly defined firmware registers to save and > restore any vulnerability migitation status. > > Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx> Reviewed-by: Steven Price <steven.price@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 >
