On Mon, 10 Jan 2022 17:12:50 +0000,
Eric Auger <eric.auger@xxxxxxxxxx> wrote:
>
> Hi Marc,
>
> On 1/7/22 5:33 PM, Marc Zyngier wrote:
> > In order to only keep the highmem devices that actually fit in
> > the PA range, check their location against the range and update
> > highest_gpa if they fit. If they don't, mark them them as disabled.
> s/them them/them
> >
> > Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
> > ---
> > hw/arm/virt.c | 34 ++++++++++++++++++++++++++++------
> > 1 file changed, 28 insertions(+), 6 deletions(-)
> >
> > diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> > index db4b0636e1..70b4773b3e 100644
> > --- a/hw/arm/virt.c
> > +++ b/hw/arm/virt.c
> > @@ -1711,21 +1711,43 @@ static void virt_set_memmap(VirtMachineState *vms, int pa_bits)
> > base = vms->memmap[VIRT_MEM].base + LEGACY_RAMLIMIT_BYTES;
> > }
> >
> > + /* We know for sure that at least the memory fits in the PA space */
> > + vms->highest_gpa = memtop - 1;
> > +
> > for (i = VIRT_LOWMEMMAP_LAST; i < ARRAY_SIZE(extended_memmap); i++) {
> > hwaddr size = extended_memmap[i].size;
> > + bool fits;
> >
> > base = ROUND_UP(base, size);
> > vms->memmap[i].base = base;
> > vms->memmap[i].size = size;
> > +
> > + /*
> > + * Check each device to see if they fit in the PA space,
> > + * moving highest_gpa as we go.
> > + *
> > + * For each device that doesn't fit, disable it.
> > + */
> > + fits = (base + size) <= BIT_ULL(pa_bits);
> > + if (fits) {
> > + vms->highest_gpa = MAX(vms->highest_gpa, base + size - 1);
> why do you need the MAX()?
Well spotted, I don't. Since we build the memmap by moving base
upward, I can directly use 'base + size - 1' as the new highest_gpa
value.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
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