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hw/arm/virt: Use the PA range to compute the memory map

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The highmem attribute is nothing but another way to express the
PA range of a VM. To support HW that has a smaller PA range then
what QEMU assumes, pass this PA range to the virt_set_memmap()
function, allowing it to correctly exclude highmem devices
if they are outside of the PA range.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-id: 20220114140741.1358263-5-maz@kernel.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Marc Zyngier 2022-01-14 14:07:39 +00:00 committed by Peter Maydell
parent 0152b169ce
commit 3715c251cc
1 changed files with 52 additions and 12 deletions
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64
hw/arm/virt.c
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@ -1667,7 +1667,7 @@ static uint64_t virt_cpu_mp_affinity(VirtMachineState *vms, int idx)
return arm_cpu_mp_affinity(idx, clustersz);
}
static void virt_set_memmap(VirtMachineState *vms)
static void virt_set_memmap(VirtMachineState *vms, int pa_bits)
{
MachineState *ms = MACHINE(vms);
hwaddr base, device_memory_base, device_memory_size, memtop;
@ -1685,6 +1685,14 @@ static void virt_set_memmap(VirtMachineState *vms)
exit(EXIT_FAILURE);
}
/*
* !highmem is exactly the same as limiting the PA space to 32bit,
* irrespective of the underlying capabilities of the HW.
*/
if (!vms->highmem) {
pa_bits = 32;
}
/*
* We compute the base of the high IO region depending on the
* amount of initial and device memory. The device memory start/size
@ -1698,8 +1706,9 @@ static void virt_set_memmap(VirtMachineState *vms)
/* Base address of the high IO region */
memtop = base = device_memory_base + ROUND_UP(device_memory_size, GiB);
if (!vms->highmem && memtop > 4 * GiB) {
error_report("highmem=off, but memory crosses the 4GiB limit\n");
if (memtop > BIT_ULL(pa_bits)) {
error_report("Addressing limited to %d bits, but memory exceeds it by %llu bytes\n",
pa_bits, memtop - BIT_ULL(pa_bits));
exit(EXIT_FAILURE);
}
if (base < device_memory_base) {
@ -1718,7 +1727,13 @@ static void virt_set_memmap(VirtMachineState *vms)
vms->memmap[i].size = size;
base += size;
}
vms->highest_gpa = (vms->highmem ? base : memtop) - 1;
/*
* 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;
@ -1909,12 +1924,43 @@ static void machvirt_init(MachineState *machine)
unsigned int smp_cpus = machine->smp.cpus;
unsigned int max_cpus = machine->smp.max_cpus;
if (!cpu_type_valid(machine->cpu_type)) {
error_report("mach-virt: CPU type %s not supported", machine->cpu_type);
exit(1);
}
possible_cpus = mc->possible_cpu_arch_ids(machine);
/*
* In accelerated mode, the memory map is computed earlier in kvm_type()
* to create a VM with the right number of IPA bits.
*/
if (!vms->memmap) {
virt_set_memmap(vms);
Object *cpuobj;
ARMCPU *armcpu;
int pa_bits;
/*
* Instanciate a temporary CPU object to find out about what
* we are about to deal with. Once this is done, get rid of
* the object.
*/
cpuobj = object_new(possible_cpus->cpus[0].type);
armcpu = ARM_CPU(cpuobj);
if (object_property_get_bool(cpuobj, "aarch64", NULL)) {
pa_bits = arm_pamax(armcpu);
} else if (arm_feature(&armcpu->env, ARM_FEATURE_LPAE)) {
/* v7 with LPAE */
pa_bits = 40;
} else {
/* Anything else */
pa_bits = 32;
}
object_unref(cpuobj);
virt_set_memmap(vms, pa_bits);
}
/* We can probe only here because during property set
@ -1922,11 +1968,6 @@ static void machvirt_init(MachineState *machine)
*/
finalize_gic_version(vms);
if (!cpu_type_valid(machine->cpu_type)) {
error_report("mach-virt: CPU type %s not supported", machine->cpu_type);
exit(1);
}
if (vms->secure) {
/*
* The Secure view of the world is the same as the NonSecure,
@ -1996,7 +2037,6 @@ static void machvirt_init(MachineState *machine)
create_fdt(vms);
possible_cpus = mc->possible_cpu_arch_ids(machine);
assert(possible_cpus->len == max_cpus);
for (n = 0; n < possible_cpus->len; n++) {
Object *cpuobj;
@ -2735,7 +2775,7 @@ static int virt_kvm_type(MachineState *ms, const char *type_str)
max_vm_pa_size = kvm_arm_get_max_vm_ipa_size(ms, &fixed_ipa);
/* we freeze the memory map to compute the highest gpa */
virt_set_memmap(vms);
virt_set_memmap(vms, max_vm_pa_size);
requested_pa_size = 64 - clz64(vms->highest_gpa);