On 5/22/2026 7:16 AM, Lisa Wang wrote:
[...]
> +
> +static inline u64 kvm_get_default_cr4(void)
> +{
> + u64 cr4 = X86_CR4_PAE | X86_CR4_OSFXSR;
> +
> + if (kvm_cpu_has(X86_FEATURE_XSAVE))
> + cr4 |= X86_CR4_OSXSAVE;
> + return cr4;
> +}
> +
[...]
> @@ -647,16 +643,12 @@ static void vcpu_init_sregs(struct kvm_vm *vm, struct
> kvm_vcpu *vcpu)
> vcpu_sregs_get(vcpu, &sregs);
>
> sregs.idt.base = vm->arch.idt;
> - sregs.idt.limit = NUM_INTERRUPTS * sizeof(struct idt_entry) - 1;
> + sregs.idt.limit = kvm_get_default_idt_limit();
> sregs.gdt.base = vm->arch.gdt;
> - sregs.gdt.limit = getpagesize() - 1;
> -
> - sregs.cr0 = X86_CR0_PE | X86_CR0_NE | X86_CR0_PG;
> - sregs.cr4 |= X86_CR4_PAE | X86_CR4_OSFXSR;
> - if (kvm_cpu_has(X86_FEATURE_XSAVE))
> - sregs.cr4 |= X86_CR4_OSXSAVE;
> - if (vm->mmu.pgtable_levels == 5)
> - sregs.cr4 |= X86_CR4_LA57;
I guess the 5-level paging thing is dropped unexpectedly during rebase?
> + sregs.gdt.limit = kvm_get_default_gdt_limit();
>
> + sregs.cr0 = kvm_get_default_cr0();
> + sregs.cr4 |= kvm_get_default_cr4();
> sregs.efer |= (EFER_LME | EFER_LMA | EFER_NX);
>
> kvm_seg_set_unusable(&sregs.ldt);
>
