Allocate memory for TDX boot parameters and define the utility functions necessary to fill this memory with the boot parameters.
Co-developed-by: Ackerley Tng ackerleytng@google.com Signed-off-by: Ackerley Tng ackerleytng@google.com Signed-off-by: Sagi Shahar sagis@google.com --- .../selftests/kvm/include/x86/tdx/tdx_util.h | 4 + .../selftests/kvm/lib/x86/tdx/tdx_util.c | 73 +++++++++++++++++++ 2 files changed, 77 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h b/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h index ec05bcd59145..dafdc7e46abe 100644 --- a/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h +++ b/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h @@ -12,5 +12,9 @@ static inline bool is_tdx_vm(struct kvm_vm *vm) }
void vm_tdx_setup_boot_code_region(struct kvm_vm *vm); +void vm_tdx_setup_boot_parameters_region(struct kvm_vm *vm, uint32_t nr_runnable_vcpus); +void vm_tdx_load_common_boot_parameters(struct kvm_vm *vm); +void vm_tdx_load_vcpu_boot_parameters(struct kvm_vm *vm, struct kvm_vcpu *vcpu); +void vm_tdx_set_vcpu_entry_point(struct kvm_vcpu *vcpu, void *guest_code);
#endif // SELFTESTS_TDX_TDX_UTIL_H diff --git a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c index 15833b9eb5d5..52dc25e0cce4 100644 --- a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c +++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c @@ -5,10 +5,12 @@ #include "kvm_util.h" #include "processor.h" #include "tdx/td_boot.h" +#include "tdx/td_boot_asm.h" #include "tdx/tdx_util.h"
/* Arbitrarily selected to avoid overlaps with anything else */ #define TD_BOOT_CODE_SLOT 20 +#define TD_BOOT_PARAMETERS_SLOT 21
#define X86_RESET_VECTOR 0xfffffff0ul #define X86_RESET_VECTOR_SIZE 16 @@ -52,3 +54,74 @@ void vm_tdx_setup_boot_code_region(struct kvm_vm *vm) hva[1] = 256 - 2 - TD_BOOT_CODE_SIZE; hva[2] = 0xcc; } + +void vm_tdx_setup_boot_parameters_region(struct kvm_vm *vm, uint32_t nr_runnable_vcpus) +{ + size_t boot_params_size = + sizeof(struct td_boot_parameters) + + nr_runnable_vcpus * sizeof(struct td_per_vcpu_parameters); + int npages = DIV_ROUND_UP(boot_params_size, PAGE_SIZE); + vm_paddr_t gpa; + + vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, + TD_BOOT_PARAMETERS_GPA, + TD_BOOT_PARAMETERS_SLOT, npages, + KVM_MEM_GUEST_MEMFD); + gpa = vm_phy_pages_alloc(vm, npages, TD_BOOT_PARAMETERS_GPA, TD_BOOT_PARAMETERS_SLOT); + TEST_ASSERT(gpa == TD_BOOT_PARAMETERS_GPA, "Failed vm_phy_pages_alloc\n"); + + virt_map(vm, TD_BOOT_PARAMETERS_GPA, TD_BOOT_PARAMETERS_GPA, npages); +} + +void vm_tdx_load_common_boot_parameters(struct kvm_vm *vm) +{ + struct td_boot_parameters *params = + addr_gpa2hva(vm, TD_BOOT_PARAMETERS_GPA); + uint32_t cr4; + + TEST_ASSERT_EQ(vm->mode, VM_MODE_PXXV48_4K); + + cr4 = kvm_get_default_cr4(); + + /* TDX spec 11.6.2: CR4 bit MCE is fixed to 1 */ + cr4 |= X86_CR4_MCE; + + /* Set this because UEFI also sets this up, to handle XMM exceptions */ + cr4 |= X86_CR4_OSXMMEXCPT; + + /* TDX spec 11.6.2: CR4 bit VMXE and SMXE are fixed to 0 */ + cr4 &= ~(X86_CR4_VMXE | X86_CR4_SMXE); + + /* Set parameters! */ + params->cr0 = kvm_get_default_cr0(); + params->cr3 = vm->pgd; + params->cr4 = cr4; + params->idtr.base = vm->arch.idt; + params->idtr.limit = kvm_get_default_idt_limit(); + params->gdtr.base = vm->arch.gdt; + params->gdtr.limit = kvm_get_default_gdt_limit(); + + TEST_ASSERT(params->cr0 != 0, "cr0 should not be 0"); + TEST_ASSERT(params->cr3 != 0, "cr3 should not be 0"); + TEST_ASSERT(params->cr4 != 0, "cr4 should not be 0"); + TEST_ASSERT(params->gdtr.base != 0, "gdt base address should not be 0"); + TEST_ASSERT(params->idtr.base != 0, "idt base address should not be 0"); +} + +void vm_tdx_load_vcpu_boot_parameters(struct kvm_vm *vm, struct kvm_vcpu *vcpu) +{ + struct td_boot_parameters *params = + addr_gpa2hva(vm, TD_BOOT_PARAMETERS_GPA); + struct td_per_vcpu_parameters *vcpu_params = + ¶ms->per_vcpu[vcpu->id]; + + vcpu_params->esp_gva = kvm_allocate_vcpu_stack(vm); +} + +void vm_tdx_set_vcpu_entry_point(struct kvm_vcpu *vcpu, void *guest_code) +{ + struct td_boot_parameters *params = addr_gpa2hva(vcpu->vm, TD_BOOT_PARAMETERS_GPA); + struct td_per_vcpu_parameters *vcpu_params = ¶ms->per_vcpu[vcpu->id]; + + vcpu_params->guest_code = (uint64_t)guest_code; +}