linux-kernel - [PATCH 1/3] selftests: kvm: do not set guest mode flag

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Message-Id: <20200727133934.25482-2-pbonzini@redhat.com>
Date:   Mon, 27 Jul 2020 09:39:32 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     vkuznets@...hat.com, aaronlewis@...gle.com
Subject: [PATCH 1/3] selftests: kvm: do not set guest mode flag

Setting KVM_STATE_NESTED_GUEST_MODE enables various consistency checks
on VMCS12 and therefore causes KVM_SET_NESTED_STATE to fail spuriously
with -EINVAL.  Do not set the flag so that we're sure to cover the
conditions included by the test, and cover the case where VMCS12 is
set and KVM_SET_NESTED_STATE is called with invalid VMCS12 contents.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 .../kvm/x86_64/vmx_set_nested_state_test.c      | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 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 54cdefdfb49d..d14a34f1b018 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
@@ -76,10 +76,8 @@ void set_default_state(struct kvm_nested_state *state)
 void set_default_vmx_state(struct kvm_nested_state *state, int size)
 {
 	memset(state, 0, size);
-	state->flags = KVM_STATE_NESTED_GUEST_MODE  |
-			KVM_STATE_NESTED_RUN_PENDING;
 	if (have_evmcs)
-		state->flags |= KVM_STATE_NESTED_EVMCS;
+		state->flags = KVM_STATE_NESTED_EVMCS;
 	state->format = 0;
 	state->size = size;
 	state->hdr.vmx.vmxon_pa = 0x1000;
@@ -190,17 +188,20 @@ void test_vmx_nested_state(struct kvm_vm *vm)
 	state->size = sizeof(*state);
 	test_nested_state(vm, state);
 
+	/*
+	 * KVM_SET_NESTED_STATE succeeds with invalid VMCS
+	 * contents but L2 not running.
+	 */
+	set_default_vmx_state(state, state_sz);
+	state->flags = 0;
+	test_nested_state(vm, state);
+
 	/* vmxon_pa cannot be the same address as vmcs_pa. */
 	set_default_vmx_state(state, state_sz);
 	state->hdr.vmx.vmxon_pa = 0;
 	state->hdr.vmx.vmcs12_pa = 0;
 	test_nested_state_expect_einval(vm, state);
 
-	/* The revision id for vmcs12 must be VMCS12_REVISION. */
-	set_default_vmx_state(state, state_sz);
-	set_revision_id_for_vmcs12(state, 0);
-	test_nested_state_expect_einval(vm, state);
-
 	/*
 	 * Test that if we leave nesting the state reflects that when we get
 	 * it again.
-- 
2.26.2