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Tue, 12 Mar 2024 10:00:33 -0700 (PDT) From: Nicholas Piggin To: qemu-devel@nongnu.org Cc: Nicholas Piggin , qemu-ppc@nongnu.org, Daniel Henrique Barboza , Harsh Prateek Bora Subject: [PULL 25/38] spapr: nested: register nested-hv api hcalls only for cap-nested-hv Date: Wed, 13 Mar 2024 02:58:36 +1000 Message-ID: <20240312165851.2240242-26-npiggin@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20240312165851.2240242-1-npiggin@gmail.com> References: <20240312165851.2240242-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=2607:f8b0:4864:20::431; envelope-from=npiggin@gmail.com; helo=mail-pf1-x431.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 @gmail.com) X-ZM-MESSAGEID: 1710263530620100007 Content-Type: text/plain; charset="utf-8" From: Harsh Prateek Bora Since cap-nested-hv is an optional capability, it makes sense to register api specfic hcalls only when respective capability is enabled. This requires to introduce a new API to unregister hypercalls to maintain sanity across guest reboot since caps are re-applied across reboots and re-registeration of hypercalls would hit assert otherwise. Reviewed-by: Nicholas Piggin Signed-off-by: Harsh Prateek Bora Signed-off-by: Nicholas Piggin --- hw/ppc/spapr.c | 1 + hw/ppc/spapr_hcall.c | 24 ++++++++++++++++++++++-- hw/ppc/spapr_nested.c | 25 +++++++++++++++++++++++-- include/hw/ppc/spapr.h | 4 ++++ include/hw/ppc/spapr_nested.h | 1 - 5 files changed, 50 insertions(+), 5 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index abd484023a..7321c35174 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -1734,6 +1734,7 @@ static void spapr_machine_reset(MachineState *machine= , ShutdownCause reason) =20 pef_kvm_reset(machine->cgs, &error_fatal); spapr_caps_apply(spapr); + spapr_nested_reset(spapr); =20 first_ppc_cpu =3D POWERPC_CPU(first_cpu); if (kvm_enabled() && kvmppc_has_cap_mmu_radix() && diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c index 75c2d12978..5e1d020e3d 100644 --- a/hw/ppc/spapr_hcall.c +++ b/hw/ppc/spapr_hcall.c @@ -1525,6 +1525,28 @@ void spapr_register_hypercall(target_ulong opcode, s= papr_hcall_fn fn) *slot =3D fn; } =20 +void spapr_unregister_hypercall(target_ulong opcode) +{ + spapr_hcall_fn *slot; + + if (opcode <=3D MAX_HCALL_OPCODE) { + assert((opcode & 0x3) =3D=3D 0); + + slot =3D &papr_hypercall_table[opcode / 4]; + } else if (opcode >=3D SVM_HCALL_BASE && opcode <=3D SVM_HCALL_MAX) { + /* we only have SVM-related hcall numbers assigned in multiples of= 4 */ + assert((opcode & 0x3) =3D=3D 0); + + slot =3D &svm_hypercall_table[(opcode - SVM_HCALL_BASE) / 4]; + } else { + assert((opcode >=3D KVMPPC_HCALL_BASE) && (opcode <=3D KVMPPC_HCAL= L_MAX)); + + slot =3D &kvmppc_hypercall_table[opcode - KVMPPC_HCALL_BASE]; + } + + *slot =3D NULL; +} + target_ulong spapr_hypercall(PowerPCCPU *cpu, target_ulong opcode, target_ulong *args) { @@ -1638,8 +1660,6 @@ static void hypercall_register_types(void) spapr_register_hypercall(KVMPPC_H_CAS, h_client_architecture_support); =20 spapr_register_hypercall(KVMPPC_H_UPDATE_DT, h_update_dt); - - spapr_register_nested(); } =20 type_init(hypercall_register_types) diff --git a/hw/ppc/spapr_nested.c b/hw/ppc/spapr_nested.c index 121aa96ddc..8e0ee0d22f 100644 --- a/hw/ppc/spapr_nested.c +++ b/hw/ppc/spapr_nested.c @@ -7,6 +7,14 @@ #include "hw/ppc/spapr_cpu_core.h" #include "hw/ppc/spapr_nested.h" =20 +void spapr_nested_reset(SpaprMachineState *spapr) +{ + if (spapr_get_cap(spapr, SPAPR_CAP_NESTED_KVM_HV)) { + spapr_unregister_nested_hv(); + spapr_register_nested_hv(); + } +} + #ifdef CONFIG_TCG #define PRTS_MASK 0x1f =20 @@ -375,20 +383,33 @@ void spapr_exit_nested(PowerPCCPU *cpu, int excp) address_space_unmap(CPU(cpu)->as, regs, len, len, true); } =20 -void spapr_register_nested(void) +void spapr_register_nested_hv(void) { spapr_register_hypercall(KVMPPC_H_SET_PARTITION_TABLE, h_set_ptbl); spapr_register_hypercall(KVMPPC_H_ENTER_NESTED, h_enter_nested); spapr_register_hypercall(KVMPPC_H_TLB_INVALIDATE, h_tlb_invalidate); spapr_register_hypercall(KVMPPC_H_COPY_TOFROM_GUEST, h_copy_tofrom_gue= st); } + +void spapr_unregister_nested_hv(void) +{ + spapr_unregister_hypercall(KVMPPC_H_SET_PARTITION_TABLE); + spapr_unregister_hypercall(KVMPPC_H_ENTER_NESTED); + spapr_unregister_hypercall(KVMPPC_H_TLB_INVALIDATE); + spapr_unregister_hypercall(KVMPPC_H_COPY_TOFROM_GUEST); +} #else void spapr_exit_nested(PowerPCCPU *cpu, int excp) { g_assert_not_reached(); } =20 -void spapr_register_nested(void) +void spapr_register_nested_hv(void) +{ + /* DO NOTHING */ +} + +void spapr_unregister_nested_hv(void) { /* DO NOTHING */ } diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index 5b5ba9ef77..78a736297b 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -631,6 +631,7 @@ typedef target_ulong (*spapr_hcall_fn)(PowerPCCPU *cpu,= SpaprMachineState *sm, target_ulong *args); =20 void spapr_register_hypercall(target_ulong opcode, spapr_hcall_fn fn); +void spapr_unregister_hypercall(target_ulong opcode); target_ulong spapr_hypercall(PowerPCCPU *cpu, target_ulong opcode, target_ulong *args); =20 @@ -1028,5 +1029,8 @@ void spapr_vof_client_dt_finalize(SpaprMachineState *= spapr, void *fdt); =20 /* H_WATCHDOG */ void spapr_watchdog_init(SpaprMachineState *spapr); +void spapr_register_nested_hv(void); +void spapr_unregister_nested_hv(void); +void spapr_nested_reset(SpaprMachineState *spapr); =20 #endif /* HW_SPAPR_H */ diff --git a/include/hw/ppc/spapr_nested.h b/include/hw/ppc/spapr_nested.h index d312a5d61d..09d95182b2 100644 --- a/include/hw/ppc/spapr_nested.h +++ b/include/hw/ppc/spapr_nested.h @@ -95,7 +95,6 @@ struct nested_ppc_state { int64_t tb_offset; }; =20 -void spapr_register_nested(void); void spapr_exit_nested(PowerPCCPU *cpu, int excp); =20 #endif /* HW_SPAPR_NESTED_H */ --=20 2.42.0