Hi Itaru,
On Tue, 25 Aug 2026 at 22:18, Itaru Kitayama <[email protected]> wrote: > > This patch series extends the arm64 KVM selftest framework > to support 52-bit guest virtual address (VA) modes in addition to > the existing 52-bit physical address (PA) configurations. > The motivation is to enable validation of LPA2 guest memory-management > behaviour in configurations that use a 52-bit VA space. > While the selftest framework already supports testing 52-bit PA > configurations, it lacks the ability to exercise guests running with > 52-bit virtual addresses, leaving part of the LPA2 functionality untested. The series adds three 52-bit VA guest modes, but nothing in tree maps a guest VA high enough to use them. The mode-iterating tests map at a fixed low GVA, so pgd_index() returns 0 and only the first entry of the top level is ever used. What do you expect the modes to catch as they stand? The allocators already take a minimum GVA, so mapping high in one of those tests looks like a small change. > To address this, the series introduces new guest modes for 52-bit VA > operation, adds five-level page table support where required, and > performs runtime detection of host 52-bit VA capability so that > LPA2-enabled guest VA tests are executed only on supported systems. > > Testing: > > Built and tested on arm64. > Verified on QEMU with a V52-capable guest configuration. > Confirmed correct operation of high virtual address mappings by > exercising guest memory accesses in the 52-bit VA range. I could not reproduce "exercising guest memory accesses in the 52-bit VA range" with anything in tree either. Could you say which test you ran, which guest modes, and on what? Thanks, /fuad > Signed-off-by: Itaru Kitayama <[email protected]> > Reviewed-by: Takayuki Okamoto <[email protected]> > --- > Itaru Kitayama (2): > KVM: selftest: arm64: Support 5-level paging in stage 1 translation > table > KVM: selftests: arm64: Add 52-bit VA guest modes > > .../selftests/kvm/include/arm64/processor.h | 2 + > tools/testing/selftests/kvm/include/kvm_util.h | 3 + > tools/testing/selftests/kvm/lib/arm64/processor.c | 87 > ++++++++++++++++++++-- > tools/testing/selftests/kvm/lib/guest_modes.c | 5 ++ > tools/testing/selftests/kvm/lib/kvm_util.c | 11 +++ > 5 files changed, 103 insertions(+), 5 deletions(-) > --- > base-commit: 8d3ae59288f1e7d58d76558a6ee96d533bc5019f > change-id: 20260825-arm64-52bit-va-32f1f4cd050d > > Best regards, > -- > Itaru Kitayama <[email protected]> >
