linux-kernel - [RFC PATCH 054/105] KVM: selftests: Convert vmx_exception_with_invalid_guest_state away from VCPU

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220311055056.57265-55-seanjc@google.com>
Date:   Fri, 11 Mar 2022 05:50:05 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>
Subject: [RFC PATCH 054/105] KVM: selftests: Convert vmx_exception_with_invalid_guest_state
 away from VCPU_ID

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 .../vmx_exception_with_invalid_guest_state.c  | 62 +++++++++++--------
 1 file changed, 36 insertions(+), 26 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86_64/vmx_exception_with_invalid_guest_state.c b/tools/testing/selftests/kvm/x86_64/vmx_exception_with_invalid_guest_state.c
index 27a850f3d7ce..70b30583e50d 100644
--- a/tools/testing/selftests/kvm/x86_64/vmx_exception_with_invalid_guest_state.c
+++ b/tools/testing/selftests/kvm/x86_64/vmx_exception_with_invalid_guest_state.c
@@ -10,10 +10,6 @@
 
 #include "kselftest.h"
 
-#define VCPU_ID	0
-
-static struct kvm_vm *vm;
-
 static void guest_ud_handler(struct ex_regs *regs)
 {
 	/* Loop on the ud2 until guest state is made invalid. */
@@ -24,11 +20,11 @@ static void guest_code(void)
 	asm volatile("ud2");
 }
 
-static void __run_vcpu_with_invalid_state(void)
+static void __run_vcpu_with_invalid_state(struct kvm_vcpu *vcpu)
 {
-	struct kvm_run *run = vcpu_state(vm, VCPU_ID);
+	struct kvm_run *run = vcpu->run;
 
-	vcpu_run(vm, VCPU_ID);
+	vcpu_run(vcpu->vm, vcpu->id);
 
 	TEST_ASSERT(run->exit_reason == KVM_EXIT_INTERNAL_ERROR,
 		    "Expected KVM_EXIT_INTERNAL_ERROR, got %d (%s)\n",
@@ -38,15 +34,15 @@ static void __run_vcpu_with_invalid_state(void)
 		    run->emulation_failure.suberror);
 }
 
-static void run_vcpu_with_invalid_state(void)
+static void run_vcpu_with_invalid_state(struct kvm_vcpu *vcpu)
 {
 	/*
 	 * Always run twice to verify KVM handles the case where _KVM_ queues
 	 * an exception with invalid state and then exits to userspace, i.e.
 	 * that KVM doesn't explode if userspace ignores the initial error.
 	 */
-	__run_vcpu_with_invalid_state();
-	__run_vcpu_with_invalid_state();
+	__run_vcpu_with_invalid_state(vcpu);
+	__run_vcpu_with_invalid_state(vcpu);
 }
 
 static void set_timer(void)
@@ -59,33 +55,43 @@ static void set_timer(void)
 	ASSERT_EQ(setitimer(ITIMER_REAL, &timer, NULL), 0);
 }
 
-static void set_or_clear_invalid_guest_state(bool set)
+static void set_or_clear_invalid_guest_state(struct kvm_vcpu *vcpu, bool set)
 {
 	static struct kvm_sregs sregs;
 
 	if (!sregs.cr0)
-		vcpu_sregs_get(vm, VCPU_ID, &sregs);
+		vcpu_sregs_get(vcpu->vm, vcpu->id, &sregs);
 	sregs.tr.unusable = !!set;
-	vcpu_sregs_set(vm, VCPU_ID, &sregs);
+	vcpu_sregs_set(vcpu->vm, vcpu->id, &sregs);
 }
 
-static void set_invalid_guest_state(void)
+static void set_invalid_guest_state(struct kvm_vcpu *vcpu)
 {
-	set_or_clear_invalid_guest_state(true);
+	set_or_clear_invalid_guest_state(vcpu, true);
 }
 
-static void clear_invalid_guest_state(void)
+static void clear_invalid_guest_state(struct kvm_vcpu *vcpu)
 {
-	set_or_clear_invalid_guest_state(false);
+	set_or_clear_invalid_guest_state(vcpu, false);
+}
+
+static struct kvm_vcpu *get_set_sigalrm_vcpu(struct kvm_vcpu *__vcpu)
+{
+	static struct kvm_vcpu *vcpu = NULL;
+
+	if (__vcpu)
+		vcpu = __vcpu;
+	return vcpu;
 }
 
 static void sigalrm_handler(int sig)
 {
+	struct kvm_vcpu *vcpu = get_set_sigalrm_vcpu(NULL);
 	struct kvm_vcpu_events events;
 
 	TEST_ASSERT(sig == SIGALRM, "Unexpected signal = %d", sig);
 
-	vcpu_events_get(vm, VCPU_ID, &events);
+	vcpu_events_get(vcpu->vm, vcpu->id, &events);
 
 	/*
 	 * If an exception is pending, attempt KVM_RUN with invalid guest,
@@ -93,8 +99,8 @@ static void sigalrm_handler(int sig)
 	 * between KVM queueing an exception and re-entering the guest.
 	 */
 	if (events.exception.pending) {
-		set_invalid_guest_state();
-		run_vcpu_with_invalid_state();
+		set_invalid_guest_state(vcpu);
+		run_vcpu_with_invalid_state(vcpu);
 	} else {
 		set_timer();
 	}
@@ -102,15 +108,19 @@ static void sigalrm_handler(int sig)
 
 int main(int argc, char *argv[])
 {
+	struct kvm_vcpu *vcpu;
+	struct kvm_vm *vm;
+
 	if (!is_intel_cpu() || vm_is_unrestricted_guest(NULL)) {
 		print_skip("Must be run with kvm_intel.unrestricted_guest=0");
 		exit(KSFT_SKIP);
 	}
 
-	vm = vm_create_default(VCPU_ID, 0, (void *)guest_code);
+	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+	get_set_sigalrm_vcpu(vcpu);
 
 	vm_init_descriptor_tables(vm);
-	vcpu_init_descriptor_tables(vm, VCPU_ID);
+	vcpu_init_descriptor_tables(vm, vcpu->id);
 
 	vm_install_exception_handler(vm, UD_VECTOR, guest_ud_handler);
 
@@ -119,8 +129,8 @@ int main(int argc, char *argv[])
 	 * KVM_RUN should induce a TRIPLE_FAULT in L2 as KVM doesn't support
 	 * emulating invalid guest state for L2.
 	 */
-	set_invalid_guest_state();
-	run_vcpu_with_invalid_state();
+	set_invalid_guest_state(vcpu);
+	run_vcpu_with_invalid_state(vcpu);
 
 	/*
 	 * Verify KVM also handles the case where userspace gains control while
@@ -129,11 +139,11 @@ int main(int argc, char *argv[])
 	 * guest with invalid state when the handler interrupts KVM with an
 	 * exception pending.
 	 */
-	clear_invalid_guest_state();
+	clear_invalid_guest_state(vcpu);
 	TEST_ASSERT(signal(SIGALRM, sigalrm_handler) != SIG_ERR,
 		    "Failed to register SIGALRM handler, errno = %d (%s)",
 		    errno, strerror(errno));
 
 	set_timer();
-	run_vcpu_with_invalid_state();
+	run_vcpu_with_invalid_state(vcpu);
 }
-- 
2.35.1.723.g4982287a31-goog