Re: panic: mutex pmap not owned at ... efirt_machdep.c:255

On Sat, Aug 4, 2018, 8:21 PM Emmanuel Vadot <manu_at_bidouilliste.com> wrote:

> On Sat, 04 Aug 2018 09:47:11 -0600
> Ian Lepore <ian_at_freebsd.org> wrote:
>
> > On Sat, 2018-08-04 at 18:43 +0300, Konstantin Belousov wrote:
> > > On Sat, Aug 04, 2018 at 09:25:47AM -0600, Ian Lepore wrote:
> > > >
> > > > On Sat, 2018-08-04 at 18:22 +0300, Konstantin Belousov wrote:
> > > > >
> > > > > On Sat, Aug 04, 2018 at 09:58:43AM -0500, Kyle Evans wrote:
> > > > > >
> > > > > >
> > > > > > On Sat, Aug 4, 2018 at 9:51 AM, Ian Lepore <ian_at_freebsd.org>
> wrote:
> > > > > > >
> > > > > > >
> > > > > > >
> > [...]
> > > > > > > What do we do on 32-bit arm that has no dmap but may have efi
> > > > > > > runtime
> > > > > > > support?
> > > > > > >
> > > > > > This should probably just be compiled out for !arm64 && !x86 -
> its
> > > > > > sole purpose was to compensate for outdated loader.efi that
> hasn't
> > > > > > done the SetVirtualAddressMap. EFI on 32-bit ARM is "new" enough
> > > > > > that
> > > > > > it shouldn't have this problem.
> > > > > Does EFI on 32bit arm have RT support ?
> > > > I suspect the uboot implementation doesn't, but I can't think of any
> > > > reason why other implementations are not possible/available. In
> > > > particular, even 32bit arm supports virtualization and such an
> > > > environment could provide rt support.
> > > No, I mean, does our kernel has RT support on armv7 ?  I only
> implemented
> > > necessary VM tricks for amd64, then it was ported to arm64, and in both
> > > cases it relies on 64bit address space and specific location of the
> KVA.
> >
> > I didn't realize the kernel implementation was arch-specific. So I
> > guess this comes under the category of "we'll solve that problem when
> > something comes along that provides efi rt for arm32."
>
>  U-Boot doesn't provide a runtime service, I never tested the available
> port of EDK2 for BBB or RPI, I guess they boot the kernel in
> HYP/non-secure mode and install an runtime in secure world along with
> some
>

When I looked at it, I'd assumed there would be VA range we'd assign to the
PAs in the EFI table that at the loader and kernel would agree on. The DMAP
does this on x64 and aarch64, but that's not an option for armv7 nor i386.

Warner

>