On Thu, May 28, 2020 at 01:55:44PM +0200, Paolo Bonzini wrote:
> On 28/05/20 04:15, Sean Christopherson wrote:
> > Explicitly set the VA width to 48 bits for the x86_64-only PXXV48_4K VM
> > mode instead of asserting the guest VA width is 48 bits. The fact that
> > KVM supports 5-level paging is irrelevant unless the selftests opt-in to
> > 5-level paging by setting CR4.LA57 for the guest. The overzealous
> > assert prevents running the selftests on a kernel with 5-level paging
> > enabled.
> >
> > Incorporate LA57 into the assert instead of removing the assert entirely
> > as a sanity check of KVM's CPUID output.
> >
> > Fixes: 567a9f1e9deb ("KVM: selftests: Introduce VM_MODE_PXXV48_4K")
> > Reported-by: Sergio Perez Gonzalez <sergio.perez.gonza...@intel.com>
> > Cc: Adriana Cervantes Jimenez <adriana.cervantes.jime...@intel.com>
> > Cc: Peter Xu <pet...@redhat.com>
> > Signed-off-by: Sean Christopherson <sean.j.christopher...@intel.com>
> > ---
> > tools/testing/selftests/kvm/lib/kvm_util.c | 11 +++++++++--
> > 1 file changed, 9 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c
> > b/tools/testing/selftests/kvm/lib/kvm_util.c
> > index c9cede5c7d0de..74776ee228f2d 100644
> > --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> > +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> > @@ -195,11 +195,18 @@ struct kvm_vm *_vm_create(enum vm_guest_mode mode,
> > uint64_t phy_pages, int perm)
> > case VM_MODE_PXXV48_4K:
> > #ifdef __x86_64__
> > kvm_get_cpu_address_width(&vm->pa_bits, &vm->va_bits);
> > - TEST_ASSERT(vm->va_bits == 48, "Linear address width "
> > - "(%d bits) not supported", vm->va_bits);
> > + /*
> > + * Ignore KVM support for 5-level paging (vm->va_bits == 57),
> > + * it doesn't take effect unless a CR4.LA57 is set, which it
> > + * isn't for this VM_MODE.
> > + */
> > + TEST_ASSERT(vm->va_bits == 48 || vm->va_bits == 57,
> > + "Linear address width (%d bits) not supported",
> > + vm->va_bits);
> > pr_debug("Guest physical address width detected: %d\n",
> > vm->pa_bits);
> > vm->pgtable_levels = 4;
> > + vm->va_bits = 48;
> > #else
> > TEST_FAIL("VM_MODE_PXXV48_4K not supported on non-x86
> > platforms");
> > #endif
> >
>
> Queued, thnaks.
>
> Paolo
Looks like this one also got lost in the 5.7 -> 5.8 transition.
