On Wed, Oct 15, 2025 at 5:40 PM Sean Christopherson <[email protected]> wrote: > > On Wed, Oct 15, 2025, Sean Christopherson wrote: > > On Wed, Sep 17, 2025, Jim Mattson wrote: > > > Add a new VM mode, VM_MODE_PXXV57_4K, to support tests that require > > > 5-level paging on x86. This mode sets up a 57-bit virtual address > > > space and sets CR4.LA57 in the guest. > > Thinking about this more, unless it's _really_ painful, e.g. because tests > assume > 4-level paging or 48-bit non-canonical address, I would rather turn > VM_MODE_PXXV48_4K > into VM_MODE_PXXVXX_4K and have ____vm_create() create the "maximal" VM. That > way tests don't need to go out of their way just to use 5-level paging, e.g. a > "TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_LA57))" is all that is needed. It will > also > gives quite a bit of coverage for free, e.g. that save/restore works with and > without 5-level paging (contrived example, but you get the point). > > The NONCANONICAL #define works for LA57, so hopefully making tests play nice > with > LA57 is straightforward?
I will see what I can do. :)
