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Date:   Mon, 6 Nov 2023 08:13:01 -0800
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Subject: Re: [PATCH 25/34] KVM: selftests: Add helpers to convert guest memory
 b/w private and shared
From:   Sean Christopherson <seanjc@google.com>
To:     Fuad Tabba <tabba@google.com>
Cc:     Paolo Bonzini <pbonzini@redhat.com>, Marc Zyngier <maz@kernel.org>,
        Oliver Upton <oliver.upton@linux.dev>,
        Huacai Chen <chenhuacai@kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Anup Patel <anup@brainfault.org>,
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        Albert Ou <aou@eecs.berkeley.edu>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
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        linux-kernel@vger.kernel.org, Xiaoyao Li <xiaoyao.li@intel.com>,
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On Mon, Nov 06, 2023, Fuad Tabba wrote:
> On Sun, Nov 5, 2023 at 4:34=E2=80=AFPM Paolo Bonzini <pbonzini@redhat.com=
> wrote:
> > +void vm_guest_mem_fallocate(struct kvm_vm *vm, uint64_t base, uint64_t=
 size,
> > +                           bool punch_hole)
> > +{
> > +       const int mode =3D FALLOC_FL_KEEP_SIZE | (punch_hole ? FALLOC_F=
L_PUNCH_HOLE : 0);
> > +       struct userspace_mem_region *region;
> > +       uint64_t end =3D base + size;
> > +       uint64_t gpa, len;
> > +       off_t fd_offset;
> > +       int ret;
> > +
> > +       for (gpa =3D base; gpa < end; gpa +=3D len) {
> > +               uint64_t offset;
> > +
> > +               region =3D userspace_mem_region_find(vm, gpa, gpa);
> > +               TEST_ASSERT(region && region->region.flags & KVM_MEM_GU=
EST_MEMFD,
> > +                           "Private memory region not found for GPA 0x=
%lx", gpa);
> > +
> > +               offset =3D (gpa - region->region.guest_phys_addr);
>=20
> nit: why the parentheses?

I simply forgot to remove them when I changed the function to support spann=
ing
multiple memslots, i.e. when the code went from this

	fd_offset =3D region->region.gmem_offset +
		    (gpa - region->region.guest_phys_addr);

to what you see above.