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KVM: selftests: add tests for shadow VMCS save/restore

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This includes setting up the shadow VMCS and the secondary execution
controls in lib/vmx.c.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-07-29 00:14:11 +02:00
parent fa58a9fa74
commit 9a78bdf31d
3 changed files with 74 additions and 5 deletions
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12
tools/testing/selftests/kvm/include/vmx.h
View File

@ -531,6 +531,18 @@ struct vmx_pages {
void *msr_hva;
uint64_t msr_gpa;
void *msr;
void *shadow_vmcs_hva;
uint64_t shadow_vmcs_gpa;
void *shadow_vmcs;
void *vmread_hva;
uint64_t vmread_gpa;
void *vmread;
void *vmwrite_hva;
uint64_t vmwrite_gpa;
void *vmwrite;
};
struct vmx_pages *vcpu_alloc_vmx(struct kvm_vm *vm, vm_vaddr_t *p_vmx_gva);

33
tools/testing/selftests/kvm/lib/vmx.c
View File

@ -44,6 +44,23 @@ vcpu_alloc_vmx(struct kvm_vm *vm, vm_vaddr_t *p_vmx_gva)
vmx->msr = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
vmx->msr_hva = addr_gva2hva(vm, (uintptr_t)vmx->msr);
vmx->msr_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->msr);
memset(vmx->msr_hva, 0, getpagesize());
/* Setup of a region of guest memory for the shadow VMCS. */
vmx->shadow_vmcs = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
vmx->shadow_vmcs_hva = addr_gva2hva(vm, (uintptr_t)vmx->shadow_vmcs);
vmx->shadow_vmcs_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->shadow_vmcs);
/* Setup of a region of guest memory for the VMREAD and VMWRITE bitmaps. */
vmx->vmread = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
vmx->vmread_hva = addr_gva2hva(vm, (uintptr_t)vmx->vmread);
vmx->vmread_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->vmread);
memset(vmx->vmread_hva, 0, getpagesize());
vmx->vmwrite = (void *)vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0);
vmx->vmwrite_hva = addr_gva2hva(vm, (uintptr_t)vmx->vmwrite);
vmx->vmwrite_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->vmwrite);
memset(vmx->vmwrite_hva, 0, getpagesize());
*p_vmx_gva = vmx_gva;
return vmx;
@ -98,6 +115,11 @@ bool prepare_for_vmx_operation(struct vmx_pages *vmx)
if (vmptrld(vmx->vmcs_gpa))
return false;
/* Setup shadow VMCS, do not load it yet. */
*(uint32_t *)(vmx->shadow_vmcs) = vmcs_revision() | 0x80000000ul;
if (vmclear(vmx->shadow_vmcs_gpa))
return false;
return true;
}
@ -109,8 +131,12 @@ static inline void init_vmcs_control_fields(struct vmx_pages *vmx)
vmwrite(VIRTUAL_PROCESSOR_ID, 0);
vmwrite(POSTED_INTR_NV, 0);
vmwrite(PIN_BASED_VM_EXEC_CONTROL, rdmsr(MSR_IA32_VMX_PINBASED_CTLS));
vmwrite(CPU_BASED_VM_EXEC_CONTROL, rdmsr(MSR_IA32_VMX_PROCBASED_CTLS));
vmwrite(PIN_BASED_VM_EXEC_CONTROL, rdmsr(MSR_IA32_VMX_TRUE_PINBASED_CTLS));
if (!vmwrite(SECONDARY_VM_EXEC_CONTROL, 0))
vmwrite(CPU_BASED_VM_EXEC_CONTROL,
rdmsr(MSR_IA32_VMX_TRUE_PROCBASED_CTLS) | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS);
else
vmwrite(CPU_BASED_VM_EXEC_CONTROL, rdmsr(MSR_IA32_VMX_TRUE_PROCBASED_CTLS));
vmwrite(EXCEPTION_BITMAP, 0);
vmwrite(PAGE_FAULT_ERROR_CODE_MASK, 0);
vmwrite(PAGE_FAULT_ERROR_CODE_MATCH, -1); /* Never match */
@ -124,7 +150,6 @@ static inline void init_vmcs_control_fields(struct vmx_pages *vmx)
vmwrite(VM_ENTRY_MSR_LOAD_COUNT, 0);
vmwrite(VM_ENTRY_INTR_INFO_FIELD, 0);
vmwrite(TPR_THRESHOLD, 0);
vmwrite(SECONDARY_VM_EXEC_CONTROL, 0);
vmwrite(CR0_GUEST_HOST_MASK, 0);
vmwrite(CR4_GUEST_HOST_MASK, 0);
@ -132,6 +157,8 @@ static inline void init_vmcs_control_fields(struct vmx_pages *vmx)
vmwrite(CR4_READ_SHADOW, get_cr4());
vmwrite(MSR_BITMAP, vmx->msr_gpa);
vmwrite(VMREAD_BITMAP, vmx->vmread_gpa);
vmwrite(VMWRITE_BITMAP, vmx->vmwrite_gpa);
}
/*

34
tools/testing/selftests/kvm/state_test.c
View File

@ -53,7 +53,15 @@ void l2_guest_code(void)
/* Exit to L1 */
vmcall();
GUEST_SYNC(7);
/* L1 has now set up a shadow VMCS for us. */
GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee);
GUEST_SYNC(9);
GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee);
GUEST_ASSERT(!vmwrite(GUEST_RIP, 0xc0fffee));
GUEST_SYNC(10);
GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0fffee);
GUEST_ASSERT(!vmwrite(GUEST_RIP, 0xc0ffffee));
GUEST_SYNC(11);
/* Done, exit to L1 and never come back. */
vmcall();
@ -94,9 +102,31 @@ void l1_guest_code(struct vmx_pages *vmx_pages)
vmwrite(GUEST_RIP, vmreadz(GUEST_RIP) + 3);
vmwrite(SECONDARY_VM_EXEC_CONTROL, SECONDARY_EXEC_SHADOW_VMCS);
vmwrite(VMCS_LINK_POINTER, vmx_pages->shadow_vmcs_gpa);
GUEST_ASSERT(!vmptrld(vmx_pages->shadow_vmcs_gpa));
GUEST_ASSERT(vmlaunch());
GUEST_SYNC(7);
GUEST_ASSERT(vmlaunch());
GUEST_ASSERT(vmresume());
vmwrite(GUEST_RIP, 0xc0ffee);
GUEST_SYNC(8);
GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee);
GUEST_ASSERT(!vmptrld(vmx_pages->vmcs_gpa));
GUEST_ASSERT(!vmresume());
GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
GUEST_SYNC(8);
GUEST_ASSERT(!vmptrld(vmx_pages->shadow_vmcs_gpa));
GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffffee);
GUEST_ASSERT(vmlaunch());
GUEST_ASSERT(vmresume());
GUEST_SYNC(12);
GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffffee);
GUEST_ASSERT(vmlaunch());
GUEST_ASSERT(vmresume());
}
void guest_code(struct vmx_pages *vmx_pages)