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([2a01:e0a:59e:9d80:527b:9dff:feef:3874]) by smtp.gmail.com with ESMTPSA id n12sm7169407wmq.30.2022.01.10.07.38.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Jan 2022 07:38:57 -0800 (PST) Subject: Re: [PATCH v4 4/6] hw/arm/virt: Use the PA range to compute the memory map To: Marc Zyngier , qemu-devel@nongnu.org References: <20220107163324.2491209-1-maz@kernel.org> <20220107163324.2491209-5-maz@kernel.org> From: Eric Auger Message-ID: Date: Mon, 10 Jan 2022 16:38:56 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <20220107163324.2491209-5-maz@kernel.org> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eric.auger@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US Received-SPF: pass client-ip=170.10.133.124; envelope-from=eric.auger@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -33 X-Spam_score: -3.4 X-Spam_bar: --- X-Spam_report: (-3.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.597, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: eric.auger@redhat.com Cc: Peter Maydell , Andrew Jones , kernel-team@android.com, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi Marc, On 1/7/22 5:33 PM, Marc Zyngier wrote: > 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 > --- > hw/arm/virt.c | 53 ++++++++++++++++++++++++++++++++++++++++++++------- > 1 file changed, 46 insertions(+), 7 deletions(-) > > diff --git a/hw/arm/virt.c b/hw/arm/virt.c > index 57c55e8a37..db4b0636e1 100644 > --- a/hw/arm/virt.c > +++ b/hw/arm/virt.c > @@ -1660,7 +1660,7 @@ 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; > @@ -1678,6 +1678,13 @@ 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; you need {} according to the QEMU coding style. Welcome to a new shiny world :-) > + > /* > * We compute the base of the high IO region depending on the > * amount of initial and device memory. The device memory start/size > @@ -1691,8 +1698,9 @@ 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) { > @@ -1711,7 +1719,13 @@ 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; > @@ -1902,12 +1916,38 @@ static void machvirt_init(MachineState *machine) > unsigned int smp_cpus = machine->smp.cpus; > unsigned int max_cpus = machine->smp.max_cpus; Move the cpu_type check before?     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 > @@ -1989,7 +2029,6 @@ 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; > @@ -2646,7 +2685,7 @@ 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); > Thanks Eric