KVM: selftests: Allocate x86's TSS at VM creation

Allocate x86's per-VM TSS at creation of a non-barebones VM.  Like the
GDT, the TSS is needed to actually run vCPUs, i.e. every non-barebones VM
is all but guaranteed to allocate the TSS sooner or later.

Reviewed-by: Ackerley Tng <ackerleytng@google.com>
Link: https://lore.kernel.org/r/20240314232637.2538648-16-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index 72b65eac2df22990b5cfa545436f12f4f0e4794b..9042f7f3330dbd5fb421deee3d876b53759d9c88 100644 (file)
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -520,9 +520,6 @@ vm_paddr_t addr_arch_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
 static void kvm_setup_tss_64bit(struct kvm_vm *vm, struct kvm_segment *segp,
                                int selector)
 {
-       if (!vm->arch.tss)
-               vm->arch.tss = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
-
        memset(segp, 0, sizeof(*segp));
        segp->base = vm->arch.tss;
        segp->limit = 0x67;
@@ -620,6 +617,8 @@ static void vm_init_descriptor_tables(struct kvm_vm *vm)
        vm->arch.gdt = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
        vm->arch.idt = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
        vm->handlers = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
+       vm->arch.tss = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
+
        /* Handlers have the same address in both address spaces.*/
        for (i = 0; i < NUM_INTERRUPTS; i++)
                set_idt_entry(vm, i, (unsigned long)(&idt_handlers)[i], 0,