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()?
> + }
> + switch (i) {
> + case VIRT_HIGH_GIC_REDIST2:
> + vms->highmem_redists &= fits;
> + break;
> + case VIRT_HIGH_PCIE_ECAM:
> + vms->highmem_ecam &= fits;
> + break;
> + case VIRT_HIGH_PCIE_MMIO:
> + vms->highmem_mmio &= fits;
> + break;
> + }
> +
> base += size;
> }
>
> - /*
> - * If base fits within pa_bits, all good. If it doesn't, limit it
> - * to the end of RAM, which is guaranteed to fit within pa_bits.
> - */
> - vms->highest_gpa = (base <= BIT_ULL(pa_bits) ? base : memtop) - 1;
> -
> if (device_memory_size > 0) {
> ms->device_memory = g_malloc0(sizeof(*ms->device_memory));
> ms->device_memory->base = device_memory_base;
Eric
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