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kvm: selftests: actually use all of lib/vmx.c
The allocation of the VMXON and VMCS is currently done twice, in lib/vmx.c and in vmx_tsc_adjust_test.c. Reorganize the code to provide a cleaner and easier to use API to the tests. lib/vmx.c now does the complete setup of the VMX data structures, but does not create the VM or set CPUID. This has to be done by the caller. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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2305339ee7
commit
87ccb7dbb2
3 changed files with 73 additions and 90 deletions
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@ -486,9 +486,22 @@ static inline uint32_t vmcs_revision(void)
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return rdmsr(MSR_IA32_VMX_BASIC);
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}
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void prepare_for_vmx_operation(void);
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void prepare_vmcs(void *guest_rip, void *guest_rsp);
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struct kvm_vm *vm_create_default_vmx(uint32_t vcpuid,
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vmx_guest_code_t guest_code);
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struct vmx_pages {
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void *vmxon_hva;
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uint64_t vmxon_gpa;
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void *vmxon;
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void *vmcs_hva;
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uint64_t vmcs_gpa;
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void *vmcs;
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void *msr_hva;
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uint64_t msr_gpa;
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void *msr;
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};
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struct vmx_pages *vcpu_alloc_vmx(struct kvm_vm *vm, vm_vaddr_t *p_vmx_gva);
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bool prepare_for_vmx_operation(struct vmx_pages *vmx);
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void prepare_vmcs(struct vmx_pages *vmx, void *guest_rip, void *guest_rsp);
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#endif /* !SELFTEST_KVM_VMX_H */
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@ -13,47 +13,43 @@
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#include "x86.h"
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#include "vmx.h"
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/* Create a default VM for VMX tests.
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/* Allocate memory regions for nested VMX tests.
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*
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* Input Args:
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* vcpuid - The id of the single VCPU to add to the VM.
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* guest_code - The vCPU's entry point
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* vm - The VM to allocate guest-virtual addresses in.
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*
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* Output Args: None
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* Output Args:
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* p_vmx_gva - The guest virtual address for the struct vmx_pages.
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*
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* Return:
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* Pointer to opaque structure that describes the created VM.
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* Pointer to structure with the addresses of the VMX areas.
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*/
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struct kvm_vm *
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vm_create_default_vmx(uint32_t vcpuid, vmx_guest_code_t guest_code)
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struct vmx_pages *
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vcpu_alloc_vmx(struct kvm_vm *vm, vm_vaddr_t *p_vmx_gva)
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{
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struct kvm_cpuid2 *cpuid;
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struct kvm_vm *vm;
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vm_vaddr_t vmxon_vaddr;
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vm_paddr_t vmxon_paddr;
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vm_vaddr_t vmcs_vaddr;
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vm_paddr_t vmcs_paddr;
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vm = vm_create_default(vcpuid, (void *) guest_code);
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/* Enable nesting in CPUID */
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vcpu_set_cpuid(vm, vcpuid, kvm_get_supported_cpuid());
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vm_vaddr_t vmx_gva = vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
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struct vmx_pages *vmx = addr_gva2hva(vm, vmx_gva);
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/* Setup of a region of guest memory for the vmxon region. */
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vmxon_vaddr = vm_vaddr_alloc(vm, getpagesize(), 0, 0, 0);
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vmxon_paddr = addr_gva2gpa(vm, vmxon_vaddr);
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vmx->vmxon = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
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vmx->vmxon_hva = addr_gva2hva(vm, (uintptr_t)vmx->vmxon);
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vmx->vmxon_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->vmxon);
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/* Setup of a region of guest memory for a vmcs. */
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vmcs_vaddr = vm_vaddr_alloc(vm, getpagesize(), 0, 0, 0);
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vmcs_paddr = addr_gva2gpa(vm, vmcs_vaddr);
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vmx->vmcs = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
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vmx->vmcs_hva = addr_gva2hva(vm, (uintptr_t)vmx->vmcs);
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vmx->vmcs_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->vmcs);
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vcpu_args_set(vm, vcpuid, 4, vmxon_vaddr, vmxon_paddr, vmcs_vaddr,
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vmcs_paddr);
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/* Setup of a region of guest memory for the MSR bitmap. */
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vmx->msr = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
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vmx->msr_hva = addr_gva2hva(vm, (uintptr_t)vmx->msr);
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vmx->msr_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->msr);
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return vm;
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*p_vmx_gva = vmx_gva;
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return vmx;
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}
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void prepare_for_vmx_operation(void)
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bool prepare_for_vmx_operation(struct vmx_pages *vmx)
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{
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uint64_t feature_control;
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uint64_t required;
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@ -88,12 +84,27 @@ void prepare_for_vmx_operation(void)
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feature_control = rdmsr(MSR_IA32_FEATURE_CONTROL);
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if ((feature_control & required) != required)
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wrmsr(MSR_IA32_FEATURE_CONTROL, feature_control | required);
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/* Enter VMX root operation. */
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*(uint32_t *)(vmx->vmxon) = vmcs_revision();
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if (vmxon(vmx->vmxon_gpa))
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return false;
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/* Load a VMCS. */
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*(uint32_t *)(vmx->vmcs) = vmcs_revision();
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if (vmclear(vmx->vmcs_gpa))
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return false;
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if (vmptrld(vmx->vmcs_gpa))
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return false;
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return true;
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}
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/*
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* Initialize the control fields to the most basic settings possible.
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*/
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static inline void init_vmcs_control_fields(void)
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static inline void init_vmcs_control_fields(struct vmx_pages *vmx)
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{
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vmwrite(VIRTUAL_PROCESSOR_ID, 0);
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vmwrite(POSTED_INTR_NV, 0);
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@ -119,6 +130,8 @@ static inline void init_vmcs_control_fields(void)
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vmwrite(CR4_GUEST_HOST_MASK, 0);
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vmwrite(CR0_READ_SHADOW, get_cr0());
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vmwrite(CR4_READ_SHADOW, get_cr4());
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vmwrite(MSR_BITMAP, vmx->msr_gpa);
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}
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/*
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@ -235,9 +248,9 @@ static inline void init_vmcs_guest_state(void *rip, void *rsp)
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vmwrite(GUEST_SYSENTER_EIP, vmreadz(HOST_IA32_SYSENTER_EIP));
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}
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void prepare_vmcs(void *guest_rip, void *guest_rsp)
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void prepare_vmcs(struct vmx_pages *vmx, void *guest_rip, void *guest_rsp)
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{
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init_vmcs_control_fields();
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init_vmcs_control_fields(vmx);
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init_vmcs_host_state();
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init_vmcs_guest_state(guest_rip, guest_rsp);
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}
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@ -46,11 +46,6 @@ enum {
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PORT_DONE,
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};
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struct vmx_page {
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vm_vaddr_t virt;
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vm_paddr_t phys;
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};
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enum {
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VMXON_PAGE = 0,
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VMCS_PAGE,
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@ -67,9 +62,6 @@ struct kvm_single_msr {
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/* The virtual machine object. */
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static struct kvm_vm *vm;
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/* Array of vmx_page descriptors that is shared with the guest. */
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struct vmx_page *vmx_pages;
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#define exit_to_l0(_port, _arg) do_exit_to_l0(_port, (unsigned long) (_arg))
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static void do_exit_to_l0(uint16_t port, unsigned long arg)
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{
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@ -105,7 +97,7 @@ static void l2_guest_code(void)
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__asm__ __volatile__("vmcall");
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}
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static void l1_guest_code(struct vmx_page *vmx_pages)
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static void l1_guest_code(struct vmx_pages *vmx_pages)
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{
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#define L2_GUEST_STACK_SIZE 64
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unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
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@ -116,23 +108,14 @@ static void l1_guest_code(struct vmx_page *vmx_pages)
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wrmsr(MSR_IA32_TSC, rdtsc() - TSC_ADJUST_VALUE);
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check_ia32_tsc_adjust(-1 * TSC_ADJUST_VALUE);
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prepare_for_vmx_operation();
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/* Enter VMX root operation. */
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*(uint32_t *)vmx_pages[VMXON_PAGE].virt = vmcs_revision();
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GUEST_ASSERT(!vmxon(vmx_pages[VMXON_PAGE].phys));
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/* Load a VMCS. */
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*(uint32_t *)vmx_pages[VMCS_PAGE].virt = vmcs_revision();
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GUEST_ASSERT(!vmclear(vmx_pages[VMCS_PAGE].phys));
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GUEST_ASSERT(!vmptrld(vmx_pages[VMCS_PAGE].phys));
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GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
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/* Prepare the VMCS for L2 execution. */
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prepare_vmcs(l2_guest_code, &l2_guest_stack[L2_GUEST_STACK_SIZE]);
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prepare_vmcs(vmx_pages, l2_guest_code,
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&l2_guest_stack[L2_GUEST_STACK_SIZE]);
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control = vmreadz(CPU_BASED_VM_EXEC_CONTROL);
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control |= CPU_BASED_USE_MSR_BITMAPS | CPU_BASED_USE_TSC_OFFSETING;
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vmwrite(CPU_BASED_VM_EXEC_CONTROL, control);
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vmwrite(MSR_BITMAP, vmx_pages[MSR_BITMAP_PAGE].phys);
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vmwrite(TSC_OFFSET, TSC_OFFSET_VALUE);
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/* Jump into L2. First, test failure to load guest CR3. */
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exit_to_l0(PORT_DONE, 0);
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}
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static void allocate_vmx_page(struct vmx_page *page)
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{
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vm_vaddr_t virt;
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virt = vm_vaddr_alloc(vm, PAGE_SIZE, 0, 0, 0);
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memset(addr_gva2hva(vm, virt), 0, PAGE_SIZE);
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page->virt = virt;
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page->phys = addr_gva2gpa(vm, virt);
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}
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static vm_vaddr_t allocate_vmx_pages(void)
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{
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vm_vaddr_t vmx_pages_vaddr;
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int i;
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vmx_pages_vaddr = vm_vaddr_alloc(
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vm, sizeof(struct vmx_page) * NUM_VMX_PAGES, 0, 0, 0);
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vmx_pages = (void *) addr_gva2hva(vm, vmx_pages_vaddr);
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for (i = 0; i < NUM_VMX_PAGES; i++)
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allocate_vmx_page(&vmx_pages[i]);
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return vmx_pages_vaddr;
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}
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void report(int64_t val)
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{
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printf("IA32_TSC_ADJUST is %ld (%lld * TSC_ADJUST_VALUE + %lld).\n",
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@ -187,7 +143,8 @@ void report(int64_t val)
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int main(int argc, char *argv[])
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{
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vm_vaddr_t vmx_pages_vaddr;
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struct vmx_pages *vmx_pages;
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vm_vaddr_t vmx_pages_gva;
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struct kvm_cpuid_entry2 *entry = kvm_get_supported_cpuid_entry(1);
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if (!(entry->ecx & CPUID_VMX)) {
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exit(KSFT_SKIP);
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}
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vm = vm_create_default_vmx(VCPU_ID, (void *) l1_guest_code);
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vm = vm_create_default(VCPU_ID, (void *) l1_guest_code);
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vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
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/* Allocate VMX pages and shared descriptors (vmx_pages). */
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vmx_pages_vaddr = allocate_vmx_pages();
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vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_vaddr);
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vmx_pages = vcpu_alloc_vmx(vm, &vmx_pages_gva);
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vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
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for (;;) {
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volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID);
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struct kvm_regs regs;
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vcpu_run(vm, VCPU_ID);
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TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
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"Got exit_reason other than KVM_EXIT_IO: %u (%s),\n",
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run->exit_reason,
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exit_reason_str(run->exit_reason));
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vcpu_regs_get(vm, VCPU_ID, ®s);
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TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
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"Got exit_reason other than KVM_EXIT_IO: %u (%s), rip=%lx\n",
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run->exit_reason,
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exit_reason_str(run->exit_reason), regs.rip);
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switch (run->io.port) {
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case PORT_ABORT:
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