| From | isaku.yamahata@intel ... | Subject | [PATCH v8 051/103] KVM: TDX: don't request KVM_REQ_APIC_PAGE_RELOAD | Date | Sun, 7 Aug 2022 15:01:36 -0700 |
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From: Isaku Yamahata <isaku.yamahata@intel.com>
TDX doesn't need APIC page depending on vapic and its callback is WARN_ON_ONCE(is_tdx). To avoid unnecessary overhead and WARN_ON_ONCE(), skip requesting KVM_REQ_APIC_PAGE_RELOAD when TD.
WARNING: arch/x86/kvm/vmx/main.c:696 vt_set_apic_access_page_addr+0x3c/0x50 [kvm_intel] RIP: 0010:vt_set_apic_access_page_addr+0x3c/0x50 [kvm_intel] Call Trace: vcpu_enter_guest+0x145d/0x24d0 [kvm] kvm_arch_vcpu_ioctl_run+0x25d/0xcc0 [kvm] kvm_vcpu_ioctl+0x414/0xa30 [kvm] __x64_sys_ioctl+0xc0/0x100 do_syscall_64+0x39/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com> --- arch/x86/kvm/x86.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 577f426ceb14..b126e407944f 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -10224,7 +10224,9 @@ void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, * Update it when it becomes invalid. */ apic_address = gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT); - if (start <= apic_address && apic_address < end) + /* TDX doesn't need APIC page. */ + if (kvm->arch.vm_type != KVM_X86_TDX_VM && + start <= apic_address && apic_address < end) kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD); } -- 2.25.1
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