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authorPaolo Bonzini <pbonzini@redhat.com>2019-06-19 16:52:27 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2019-06-20 18:05:13 +0200
commit9fd588772636bcbe48669d880efa2e1cc0575ebd (patch)
treead7608c51d76f37b0aa53277a38aefb80f3ee172 /tools
parent9dba988edb31d013003b7f00e82dd56f01db70c3 (diff)
KVM: nVMX: reorganize initial steps of vmx_set_nested_state
Commit 332d079735f5 ("KVM: nVMX: KVM_SET_NESTED_STATE - Tear down old EVMCS state before setting new state", 2019-05-02) broke evmcs_test because the eVMCS setup must be performed even if there is no VMXON region defined, as long as the eVMCS bit is set in the assist page. While the simplest possible fix would be to add a check on kvm_state->flags & KVM_STATE_NESTED_EVMCS in the initial "if" that covers kvm_state->hdr.vmx.vmxon_pa == -1ull, that is quite ugly. Instead, this patch moves checks earlier in the function and conditionalizes them on kvm_state->hdr.vmx.vmxon_pa, so that vmx_set_nested_state always goes through vmx_leave_nested and nested_enable_evmcs. Fixes: 332d079735f5 ("KVM: nVMX: KVM_SET_NESTED_STATE - Tear down old EVMCS state before setting new state") Cc: Aaron Lewis <aaronlewis@google.com> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c32
1 files changed, 20 insertions, 12 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c b/tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c
index 0648fe6df5a8..e64ca20b315a 100644
--- a/tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c
+++ b/tools/testing/selftests/kvm/x86_64/vmx_set_nested_state_test.c
@@ -123,36 +123,44 @@ void test_vmx_nested_state(struct kvm_vm *vm)
/*
* We cannot virtualize anything if the guest does not have VMX
* enabled. We expect KVM_SET_NESTED_STATE to return 0 if vmxon_pa
- * is set to -1ull.
+ * is set to -1ull, but the flags must be zero.
*/
set_default_vmx_state(state, state_sz);
state->hdr.vmx.vmxon_pa = -1ull;
+ test_nested_state_expect_einval(vm, state);
+
+ state->hdr.vmx.vmcs12_pa = -1ull;
+ state->flags = KVM_STATE_NESTED_EVMCS;
+ test_nested_state_expect_einval(vm, state);
+
+ state->flags = 0;
test_nested_state(vm, state);
/* Enable VMX in the guest CPUID. */
vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
- /* It is invalid to have vmxon_pa == -1ull and SMM flags non-zero. */
+ /*
+ * Setting vmxon_pa == -1ull and vmcs_pa == -1ull exits early without
+ * setting the nested state but flags other than eVMCS must be clear.
+ */
set_default_vmx_state(state, state_sz);
state->hdr.vmx.vmxon_pa = -1ull;
+ state->hdr.vmx.vmcs12_pa = -1ull;
+ test_nested_state_expect_einval(vm, state);
+
+ state->flags = KVM_STATE_NESTED_EVMCS;
+ test_nested_state(vm, state);
+
+ /* It is invalid to have vmxon_pa == -1ull and SMM flags non-zero. */
state->hdr.vmx.smm.flags = 1;
test_nested_state_expect_einval(vm, state);
/* It is invalid to have vmxon_pa == -1ull and vmcs_pa != -1ull. */
set_default_vmx_state(state, state_sz);
state->hdr.vmx.vmxon_pa = -1ull;
- state->hdr.vmx.vmcs12_pa = 0;
+ state->flags = 0;
test_nested_state_expect_einval(vm, state);
- /*
- * Setting vmxon_pa == -1ull and vmcs_pa == -1ull exits early without
- * setting the nested state.
- */
- set_default_vmx_state(state, state_sz);
- state->hdr.vmx.vmxon_pa = -1ull;
- state->hdr.vmx.vmcs12_pa = -1ull;
- test_nested_state(vm, state);
-
/* It is invalid to have vmxon_pa set to a non-page aligned address. */
set_default_vmx_state(state, state_sz);
state->hdr.vmx.vmxon_pa = 1;