Re: [PATCH 25/34] KVM: selftests: Add helpers to convert guest memory b/w private and shared

[Fuad Tabba]

On Mon, Nov 6, 2023 at 4:13 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote:
>
> On Mon, Nov 06, 2023, Fuad Tabba wrote:
> > On Sun, Nov 5, 2023 at 4:34 PM Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
> > > +void vm_guest_mem_fallocate(struct kvm_vm *vm, uint64_t base, uint64_t size,
> > > +                           bool punch_hole)
> > > +{
> > > +       const int mode = FALLOC_FL_KEEP_SIZE | (punch_hole ? FALLOC_FL_PUNCH_HOLE : 0);
> > > +       struct userspace_mem_region *region;
> > > +       uint64_t end = base + size;
> > > +       uint64_t gpa, len;
> > > +       off_t fd_offset;
> > > +       int ret;
> > > +
> > > +       for (gpa = base; gpa < end; gpa += len) {
> > > +               uint64_t offset;
> > > +
> > > +               region = userspace_mem_region_find(vm, gpa, gpa);
> > > +               TEST_ASSERT(region && region->region.flags & KVM_MEM_GUEST_MEMFD,
> > > +                           "Private memory region not found for GPA 0x%lx", gpa);
> > > +
> > > +               offset = (gpa - region->region.guest_phys_addr);
> >
> > nit: why the parentheses?
>
> I simply forgot to remove them when I changed the function to support spanning
> multiple memslots, i.e. when the code went from this
>
>         fd_offset = region->region.gmem_offset +
>                     (gpa - region->region.guest_phys_addr);
>
> to what you see above.

I wasn't actually expecting an answer, but I literally _did_ ask for it :)

Thanks,
/fuad