https://bugzilla.kernel.org/show_bug.cgi?id=54461
Summary: nVMX: Downgrading nested VMX features from user-space
Product: Virtualization
Version: unspecified
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: enhancement
Priority: P1
Component: kvm
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
In nested SVM, the sub-features of SVM are all part of CPUID, so we already
have a user-space interface (KVM_GET_SUPPORTED_CPUID/KVM_SET_CPUID2) to set a
guest's features - which is, for example, useful for dictating a fixed set of
features across different hosts.
However, in nested VMX, the VMX sub-features offered or not to the guest are
not in CPUID, but rather in MSRs, and currently the
nested_vmx_setup_ctls_msrs() function determines their value - without any
option for user space to control this. We need some sort of new
KVM_SET_READONLY_MSRS ioctl for overriding (downgrading)
nested_vmx_setup_ctls_msrs()'s decisions for a particular guest.
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