On Tue, 28 Oct 2025 15:30:38 -0700, Jim Mattson wrote:
Prior to commit 9245fd6b8531 ("KVM: x86: model canonical checks more precisely"), KVM_SET_NESTED_STATE would fail if the state was captured with L2 active, L1 had CR4.LA57 set, L2 did not, and the VMCS12.HOST_GSBASE (or other host-state field checked for canonicality) had an address greater than 48 bits wide.
Add a regression test that reproduces the KVM_SET_NESTED_STATE failure conditions. To do so, the first three patches add support for 5-level paging in the selftest L1 VM.
[...]
Applied to kvm-x86 selftests, thanks!
[1/4] KVM: selftests: Use a loop to create guest page tables https://github.com/kvm-x86/linux/commit/ae5b498b8da9 [2/4] KVM: selftests: Use a loop to walk guest page tables https://github.com/kvm-x86/linux/commit/2103a8baf5cb [3/4] KVM: selftests: Change VM_MODE_PXXV48_4K to VM_MODE_PXXVYY_4K https://github.com/kvm-x86/linux/commit/ec5806639e39 [4/4] KVM: selftests: Add a VMX test for LA57 nested state https://github.com/kvm-x86/linux/commit/6a8818de21d2