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kvm: selftests: add test for nested state save/restore

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-07-28 21:56:09 +02:00
parent 8fcc4b5923
commit cb5476379f
3 changed files with 132 additions and 1 deletions
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33
tools/testing/selftests/kvm/include/vmx.h
View file

@ -380,6 +380,30 @@ static inline int vmptrld(uint64_t vmcs_pa)
return ret;
}
static inline int vmptrst(uint64_t *value)
{
uint64_t tmp;
uint8_t ret;
__asm__ __volatile__("vmptrst %[value]; setna %[ret]"
: [value]"=m"(tmp), [ret]"=rm"(ret)
: : "cc", "memory");
*value = tmp;
return ret;
}
/*
* A wrapper around vmptrst that ignores errors and returns zero if the
* vmptrst instruction fails.
*/
static inline uint64_t vmptrstz(void)
{
uint64_t value = 0;
vmptrst(&value);
return value;
}
/*
* No guest state (e.g. GPRs) is established by this vmlaunch.
*/
@ -444,6 +468,15 @@ static inline int vmresume(void)
return ret;
}
static inline void vmcall(void)
{
/* Currently, L1 destroys our GPRs during vmexits. */
__asm__ __volatile__("push %%rbp; vmcall; pop %%rbp" : : :
"rax", "rbx", "rcx", "rdx",
"rsi", "rdi", "r8", "r9", "r10", "r11", "r12",
"r13", "r14", "r15");
}
static inline int vmread(uint64_t encoding, uint64_t *value)
{
uint64_t tmp;

29
tools/testing/selftests/kvm/lib/x86.c
View file

@ -736,6 +736,10 @@ struct kvm_x86_state {
struct kvm_xcrs xcrs;
struct kvm_sregs sregs;
struct kvm_debugregs debugregs;
union {
struct kvm_nested_state nested;
char nested_[16384];
};
struct kvm_msrs msrs;
};
@ -758,6 +762,14 @@ struct kvm_x86_state *vcpu_save_state(struct kvm_vm *vm, uint32_t vcpuid)
struct kvm_msr_list *list;
struct kvm_x86_state *state;
int nmsrs, r, i;
static int nested_size = -1;
if (nested_size == -1) {
nested_size = kvm_check_cap(KVM_CAP_NESTED_STATE);
TEST_ASSERT(nested_size <= sizeof(state->nested_),
"Nested state size too big, %i > %zi",
nested_size, sizeof(state->nested_));
}
nmsrs = kvm_get_num_msrs(vm);
list = malloc(sizeof(*list) + nmsrs * sizeof(list->indices[0]));
@ -791,6 +803,17 @@ struct kvm_x86_state *vcpu_save_state(struct kvm_vm *vm, uint32_t vcpuid)
TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_SREGS, r: %i",
r);
if (nested_size) {
state->nested.size = sizeof(state->nested_);
r = ioctl(vcpu->fd, KVM_GET_NESTED_STATE, &state->nested);
TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_NESTED_STATE, r: %i",
r);
TEST_ASSERT(state->nested.size <= nested_size,
"Nested state size too big, %i (KVM_CHECK_CAP gave %i)",
state->nested.size, nested_size);
} else
state->nested.size = 0;
state->msrs.nmsrs = nmsrs;
for (i = 0; i < nmsrs; i++)
state->msrs.entries[i].index = list->indices[i];
@ -811,6 +834,12 @@ void vcpu_load_state(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_x86_state *s
struct vcpu *vcpu = vcpu_find(vm, vcpuid);
int r;
if (state->nested.size) {
r = ioctl(vcpu->fd, KVM_SET_NESTED_STATE, &state->nested);
TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_NESTED_STATE, r: %i",
r);
}
r = ioctl(vcpu->fd, KVM_SET_XSAVE, &state->xsave);
TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_XSAVE, r: %i",
r);

71
tools/testing/selftests/kvm/state_test.c
View file

@ -18,6 +18,7 @@
#include "kvm_util.h"
#include "x86.h"
#include "vmx.h"
#define VCPU_ID 5
#define PORT_SYNC 0x1000
@ -45,16 +46,75 @@ static inline void __exit_to_l0(uint16_t port, uint64_t arg0, uint64_t arg1)
static bool have_nested_state;
void guest_code(void)
void l2_guest_code(void)
{
GUEST_SYNC(5);
/* Exit to L1 */
vmcall();
GUEST_SYNC(7);
/* Done, exit to L1 and never come back. */
vmcall();
}
void l1_guest_code(struct vmx_pages *vmx_pages)
{
#define L2_GUEST_STACK_SIZE 64
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
GUEST_ASSERT(vmx_pages->vmcs_gpa);
GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
GUEST_SYNC(3);
GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
prepare_vmcs(vmx_pages, l2_guest_code,
&l2_guest_stack[L2_GUEST_STACK_SIZE]);
GUEST_SYNC(4);
GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
GUEST_ASSERT(!vmlaunch());
GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
/* Check that the launched state is preserved. */
GUEST_ASSERT(vmlaunch());
GUEST_ASSERT(!vmresume());
GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
GUEST_SYNC(6);
GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
GUEST_ASSERT(!vmresume());
GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
vmwrite(GUEST_RIP, vmreadz(GUEST_RIP) + 3);
GUEST_ASSERT(!vmresume());
GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
GUEST_SYNC(8);
}
void guest_code(struct vmx_pages *vmx_pages)
{
GUEST_SYNC(1);
GUEST_SYNC(2);
if (vmx_pages)
l1_guest_code(vmx_pages);
exit_to_l0(PORT_DONE, 0, 0);
}
int main(int argc, char *argv[])
{
struct vmx_pages *vmx_pages = NULL;
vm_vaddr_t vmx_pages_gva = 0;
struct kvm_regs regs1, regs2;
struct kvm_vm *vm;
struct kvm_run *run;
@ -69,6 +129,15 @@ int main(int argc, char *argv[])
run = vcpu_state(vm, VCPU_ID);
vcpu_regs_get(vm, VCPU_ID, &regs1);
if (kvm_check_cap(KVM_CAP_NESTED_STATE)) {
vmx_pages = vcpu_alloc_vmx(vm, &vmx_pages_gva);
vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
} else {
printf("will skip nested state checks\n");
vcpu_args_set(vm, VCPU_ID, 1, 0);
}
for (stage = 1;; stage++) {
_vcpu_run(vm, VCPU_ID);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,