On Fri, Apr 29, 2022 at 06:39:35PM +0000, David Matlack wrote:
> +static void perf_test_l1_guest_code(struct vmx_pages *vmx, uint64_t vcpu_id)
> +{
> +#define L2_GUEST_STACK_SIZE 64
> + unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
> + unsigned long *rsp;
> +
> + GUEST_ASSERT(vmx->vmcs_gpa);
> + GUEST_ASSERT(prepare_for_vmx_operation(vmx));
> + GUEST_ASSERT(load_vmcs(vmx));
> + GUEST_ASSERT(ept_1g_pages_supported());
> +
> + rsp = &l2_guest_stack[L2_GUEST_STACK_SIZE - 1];
> + *rsp = vcpu_id;
> + prepare_vmcs(vmx, perf_test_l2_guest_entry, rsp);
Just to purely ask: is this setting the same stack pointer to all the
vcpus?
> +
> + GUEST_ASSERT(!vmlaunch());
> + GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
> + GUEST_DONE();
> +}
[...]
> +/* Identity map the entire guest physical address space with 1GiB Pages. */
> +void nested_map_all_1g(struct vmx_pages *vmx, struct kvm_vm *vm)
> +{
> + __nested_map(vmx, vm, 0, 0, vm->max_gfn << vm->page_shift, PG_LEVEL_1G);
> +}
Could max_gfn be large? Could it consumes a bunch of pages even if mapping
1G only?
Thanks,
--
Peter Xu
