diff options
| author | Naveen N Rao <naveen@kernel.org> | 2025-09-05 00:03:05 +0530 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-10-17 15:23:24 -0700 |
| commit | 54ffe74cc4ab2e7c6dd0a37a2298fffb642acba7 (patch) | |
| tree | 75e5bcce058e342c083d3eccaefeeef1da2bbe08 /arch/x86/kvm/svm/avic.c | |
| parent | ca11d9d35e958d2b4020d1a360ddc277be3ee86c (diff) | |
KVM: SVM: Move AVIC Physical ID table allocation to vcpu_precreate()
With support for 4k vCPUs in x2AVIC, the size of the AVIC Physical ID
table is expanded from a single 4k page to a maximum of 8 contiguous 4k
pages. The actual number of pages allocated depends on the maximum
possible APIC ID in the guest, which is only known by the time the first
vCPU is created. In preparation for supporting a dynamic AVIC Physical
ID table size, move its allocation to vcpu_precreate().
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Naveen N Rao (AMD) <naveen@kernel.org>
Link: https://lore.kernel.org/r/7dc764e0af7f01440bbac3d9215ed174027c2384.1757009416.git.naveen@kernel.org
[sean: drop enable_apicv check from svm_vcpu_precreate()]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/svm/avic.c')
| -rw-r--r-- | arch/x86/kvm/svm/avic.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c index b31be39a118f..9866ef73501e 100644 --- a/arch/x86/kvm/svm/avic.c +++ b/arch/x86/kvm/svm/avic.c @@ -264,6 +264,23 @@ int avic_ga_log_notifier(u32 ga_tag) return 0; } +int avic_alloc_physical_id_table(struct kvm *kvm) +{ + struct kvm_svm *kvm_svm = to_kvm_svm(kvm); + + if (!irqchip_in_kernel(kvm) || !enable_apicv) + return 0; + + if (kvm_svm->avic_physical_id_table) + return 0; + + kvm_svm->avic_physical_id_table = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT); + if (!kvm_svm->avic_physical_id_table) + return -ENOMEM; + + return 0; +} + void avic_vm_destroy(struct kvm *kvm) { unsigned long flags; @@ -291,10 +308,6 @@ int avic_vm_init(struct kvm *kvm) if (!enable_apicv) return 0; - kvm_svm->avic_physical_id_table = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT); - if (!kvm_svm->avic_physical_id_table) - goto free_avic; - kvm_svm->avic_logical_id_table = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT); if (!kvm_svm->avic_logical_id_table) goto free_avic; |