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Tsirkin" , Cornelia Huck Subject: [PATCH v2 06/14] s390x: introduce s390_get_memory_limit() Date: Tue, 8 Oct 2024 12:54:47 +0200 Message-ID: <20241008105455.2302628-7-david@redhat.com> In-Reply-To: <20241008105455.2302628-1-david@redhat.com> References: <20241008105455.2302628-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.153, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1728385010577116600 Content-Type: text/plain; charset="utf-8" Let's add s390_get_memory_limit(), to query what has been successfully set via s390_set_memory_limit(). Allow setting the limit only once. We'll remember the limit in the machine state. Move s390_set_memory_limit() to machine code, merging it into set_memory_limit(), because this really is a machine property. Acked-by: Michael S. Tsirkin Signed-off-by: David Hildenbrand Reviewed-by: Thomas Huth --- hw/s390x/s390-virtio-ccw.c | 22 ++++++++++++++++++---- include/hw/s390x/s390-virtio-ccw.h | 3 +++ target/s390x/cpu-sysemu.c | 8 -------- target/s390x/cpu.h | 1 - 4 files changed, 21 insertions(+), 13 deletions(-) diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index f4c4433b23..749d46e700 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -45,6 +45,7 @@ #include "migration/blocker.h" #include "qapi/visitor.h" #include "hw/s390x/cpu-topology.h" +#include "kvm/kvm_s390x.h" #include CONFIG_DEVICES =20 static Error *pv_mig_blocker; @@ -121,12 +122,16 @@ static void subsystem_reset(void) } } =20 -static void set_memory_limit(uint64_t new_limit) +static void s390_set_memory_limit(S390CcwMachineState *s390ms, + uint64_t new_limit) { uint64_t hw_limit; - int ret; + int ret =3D 0; =20 - ret =3D s390_set_memory_limit(new_limit, &hw_limit); + assert(!s390ms->memory_limit && new_limit); + if (kvm_enabled()) { + ret =3D kvm_s390_set_mem_limit(new_limit, &hw_limit); + } if (ret =3D=3D -E2BIG) { error_report("host supports a maximum of %" PRIu64 " GB", hw_limit / GiB); @@ -135,10 +140,19 @@ static void set_memory_limit(uint64_t new_limit) error_report("setting the guest size failed"); exit(EXIT_FAILURE); } + s390ms->memory_limit =3D new_limit; +} + +uint64_t s390_get_memory_limit(S390CcwMachineState *s390ms) +{ + /* We expect to be called only after the limit was set. */ + assert(s390ms->memory_limit); + return s390ms->memory_limit; } =20 static void s390_memory_init(MachineState *machine) { + S390CcwMachineState *s390ms =3D S390_CCW_MACHINE(machine); MemoryRegion *sysmem =3D get_system_memory(); MemoryRegion *ram =3D machine->ram; uint64_t ram_size =3D memory_region_size(ram); @@ -154,7 +168,7 @@ static void s390_memory_init(MachineState *machine) exit(EXIT_FAILURE); } =20 - set_memory_limit(ram_size); + s390_set_memory_limit(s390ms, ram_size); =20 /* Map the initial memory. Must happen after setting the memory limit.= */ memory_region_add_subregion(sysmem, 0, ram); diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-vir= tio-ccw.h index 996864a34e..eb04542979 100644 --- a/include/hw/s390x/s390-virtio-ccw.h +++ b/include/hw/s390x/s390-virtio-ccw.h @@ -29,10 +29,13 @@ struct S390CcwMachineState { bool dea_key_wrap; bool pv; uint8_t loadparm[8]; + uint64_t memory_limit; =20 SCLPDevice *sclp; }; =20 +uint64_t s390_get_memory_limit(S390CcwMachineState *s390ms); + #define S390_PTF_REASON_NONE (0x00 << 8) #define S390_PTF_REASON_DONE (0x01 << 8) #define S390_PTF_REASON_BUSY (0x02 << 8) diff --git a/target/s390x/cpu-sysemu.c b/target/s390x/cpu-sysemu.c index 1cd30c1d84..3118a25fee 100644 --- a/target/s390x/cpu-sysemu.c +++ b/target/s390x/cpu-sysemu.c @@ -255,14 +255,6 @@ unsigned int s390_cpu_set_state(uint8_t cpu_state, S39= 0CPU *cpu) return s390_count_running_cpus(); } =20 -int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit) -{ - if (kvm_enabled()) { - return kvm_s390_set_mem_limit(new_limit, hw_limit); - } - return 0; -} - void s390_set_max_pagesize(uint64_t pagesize, Error **errp) { if (kvm_enabled()) { diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h index 5ef61b1f75..b4506539f0 100644 --- a/target/s390x/cpu.h +++ b/target/s390x/cpu.h @@ -881,7 +881,6 @@ static inline void s390_do_cpu_load_normal(CPUState *cs= , run_on_cpu_data arg) =20 /* cpu.c */ void s390_crypto_reset(void); -int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit); void s390_set_max_pagesize(uint64_t pagesize, Error **errp); void s390_cmma_reset(void); void s390_enable_css_support(S390CPU *cpu); --=20 2.46.1