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Peter Anvin" , Kim Phillips , Jarkko Sakkinen , Jethro Beekman , Kai Huang Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Robert Hu , Gao Chao References: <20211231142849.611-1-guang.zeng@intel.com> <20211231142849.611-8-guang.zeng@intel.com> From: Tom Lendacky Message-ID: <640e82f3-489d-60af-1d31-25096bef1a46@amd.com> Date: Wed, 5 Jan 2022 13:13:46 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 In-Reply-To: <20211231142849.611-8-guang.zeng@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: CH2PR04CA0029.namprd04.prod.outlook.com (2603:10b6:610:52::39) To DM4PR12MB5229.namprd12.prod.outlook.com (2603:10b6:5:398::12) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 03001b38-7bc4-4966-3a7e-08d9d07f815c X-MS-TrafficTypeDiagnostic: DM8PR12MB5414:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:597; 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> > void (*vcpu_deliver_sipi_vector)(struct kvm_vcpu *vcpu, u8 vector); > + void (*update_ipiv_pid_entry)(struct kvm_vcpu *vcpu, u8 old_id, u8 new_id); > }; > > struct kvm_x86_nested_ops { > diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c > index 3ce7142ba00e..83c2c7594bcd 100644 > --- a/arch/x86/kvm/lapic.c > +++ b/arch/x86/kvm/lapic.c > @@ -2007,9 +2007,12 @@ int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val) > > switch (reg) { > case APIC_ID: /* Local APIC ID */ > - if (!apic_x2apic_mode(apic)) > + if (!apic_x2apic_mode(apic)) { > + u8 old_id = kvm_lapic_get_reg(apic, APIC_ID) >> 24; > + > kvm_apic_set_xapic_id(apic, val >> 24); > - else > + kvm_x86_ops.update_ipiv_pid_entry(apic->vcpu, old_id, val >> 24); Won't this blow up on AMD since there is no corresponding SVM op? Thanks, Tom > + } else > ret = 1; > break; > > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c > index 2e65464d6dee..f21ce15c5eb8 100644 > --- a/arch/x86/kvm/vmx/vmx.c > +++ b/arch/x86/kvm/vmx/vmx.c > @@ -7633,6 +7633,17 @@ static void vmx_vm_destroy(struct kvm *kvm) > free_pages((unsigned long)kvm_vmx->pid_table, MAX_PID_TABLE_ORDER); > } > > +static void vmx_update_ipiv_pid_entry(struct kvm_vcpu *vcpu, u8 old_id, u8 new_id) > +{ > + if (enable_ipiv && kvm_vcpu_apicv_active(vcpu)) { > + u64 *pid_table = to_kvm_vmx(vcpu->kvm)->pid_table; > + > + WRITE_ONCE(pid_table[old_id], 0); > + WRITE_ONCE(pid_table[new_id], __pa(&to_vmx(vcpu)->pi_desc) | > + PID_TABLE_ENTRY_VALID); > + } > +} > + > static struct kvm_x86_ops vmx_x86_ops __initdata = { > .name = "kvm_intel", > > @@ -7770,6 +7781,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = { > .complete_emulated_msr = kvm_complete_insn_gp, > > .vcpu_deliver_sipi_vector = kvm_vcpu_deliver_sipi_vector, > + .update_ipiv_pid_entry = vmx_update_ipiv_pid_entry, > }; > > static __init void vmx_setup_user_return_msrs(void) >