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Tsirkin" , Peter Xu , Eduardo Habkost , Marcel Apfelbaum , Yanan Wang , Michal Privoznik , =?UTF-8?Q?Daniel_P_=2e_Berrang=c3=a9?= , Gavin Shan , Alex Williamson , Stefan Hajnoczi , "Maciej S . Szmigiero" , kvm@vger.kernel.org References: <20230825132149.366064-1-david@redhat.com> <20230825132149.366064-5-david@redhat.com> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= In-Reply-To: <20230825132149.366064-5-david@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::435; envelope-from=philmd@linaro.org; helo=mail-wr1-x435.google.com X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-2.169, RCVD_IN_DNSWL_NONE=-0.0001, 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 25/8/23 15:21, David Hildenbrand wrote: > Let's return the number of free slots instead of only checking if there > is a free slot. While at it, check all address spaces, which will also > consider SMM under x86 correctly. > > Make the stub return UINT_MAX, such that we can call the function > unconditionally. > > This is a preparation for memory devices that consume multiple memslots. > > Signed-off-by: David Hildenbrand > --- > accel/kvm/kvm-all.c | 33 ++++++++++++++++++++------------- > accel/stubs/kvm-stub.c | 4 ++-- > hw/mem/memory-device.c | 2 +- > include/sysemu/kvm.h | 2 +- > include/sysemu/kvm_int.h | 1 + > 5 files changed, 25 insertions(+), 17 deletions(-) > diff --git a/accel/stubs/kvm-stub.c b/accel/stubs/kvm-stub.c > index 235dc661bc..f39997d86e 100644 > --- a/accel/stubs/kvm-stub.c > +++ b/accel/stubs/kvm-stub.c > @@ -109,9 +109,9 @@ int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n, > return -ENOSYS; > } > > -bool kvm_has_free_slot(MachineState *ms) > +unsigned int kvm_get_free_memslots(void) > { > - return false; > + return UINT_MAX; Isn't it clearer returning 0 here and keeping kvm_enabled() below? > } > > void kvm_init_cpu_signals(CPUState *cpu) > diff --git a/hw/mem/memory-device.c b/hw/mem/memory-device.c > index 667d56bd29..7c24685796 100644 > --- a/hw/mem/memory-device.c > +++ b/hw/mem/memory-device.c > @@ -59,7 +59,7 @@ static void memory_device_check_addable(MachineState *ms, MemoryRegion *mr, > const uint64_t size = memory_region_size(mr); > > /* we will need a new memory slot for kvm and vhost */ > - if (kvm_enabled() && !kvm_has_free_slot(ms)) { > + if (!kvm_get_free_memslots()) { (here) > error_setg(errp, "hypervisor has no free memory slots left"); > return; > } > diff --git a/include/sysemu/kvm_int.h b/include/sysemu/kvm_int.h > index 511b42bde5..8b09e78b12 100644 > --- a/include/sysemu/kvm_int.h > +++ b/include/sysemu/kvm_int.h > @@ -40,6 +40,7 @@ typedef struct KVMMemoryUpdate { > typedef struct KVMMemoryListener { > MemoryListener listener; > KVMSlot *slots; > + int nr_used_slots; Preferably using 'unsigned' here: Reviewed-by: Philippe Mathieu-Daudé