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: <20250422161304.579394-6-zack.rusin@broadcom.com>
Date: Tue, 22 Apr 2025 12:12:24 -0400
From: Zack Rusin <zack.rusin@...adcom.com>
To: linux-kernel@...r.kernel.org
Cc: Zack Rusin <zack.rusin@...adcom.com>,
	Doug Covelli <doug.covelli@...adcom.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Shuah Khan <shuah@...nel.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Joel Stanley <joel@....id.au>,
	Isaku Yamahata <isaku.yamahata@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	kvm@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH v2 5/5] KVM: selftests: x86: Add a test for KVM_CAP_X86_VMWARE_HYPERCALL

Add a testcase to exercise KVM_CAP_X86_VMWARE_HYPERCALL and validate
that KVM exits to userspace on hypercalls and registers are correctly
preserved.

Signed-off-by: Zack Rusin <zack.rusin@...adcom.com>
Cc: Doug Covelli <doug.covelli@...adcom.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Sean Christopherson <seanjc@...gle.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Joel Stanley <joel@....id.au>
Cc: Zack Rusin <zack.rusin@...adcom.com>
Cc: Isaku Yamahata <isaku.yamahata@...el.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: linux-kernel@...r.kernel.org
Cc: kvm@...r.kernel.org
Cc: linux-kselftest@...r.kernel.org
---
 tools/include/uapi/linux/kvm.h                |   3 +
 tools/testing/selftests/kvm/Makefile.kvm      |   1 +
 .../selftests/kvm/x86/vmware_hypercall_test.c | 121 ++++++++++++++++++
 3 files changed, 125 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/x86/vmware_hypercall_test.c

diff --git a/tools/include/uapi/linux/kvm.h b/tools/include/uapi/linux/kvm.h
index 502ea63b5d2e..3b3ad1827245 100644
--- a/tools/include/uapi/linux/kvm.h
+++ b/tools/include/uapi/linux/kvm.h
@@ -933,6 +933,9 @@ struct kvm_enable_cap {
 #define KVM_CAP_PRE_FAULT_MEMORY 236
 #define KVM_CAP_X86_APIC_BUS_CYCLES_NS 237
 #define KVM_CAP_X86_GUEST_MODE 238
+#define KVM_CAP_X86_VMWARE_BACKDOOR 239
+#define KVM_CAP_X86_VMWARE_HYPERCALL 240
+#define KVM_CAP_X86_VMWARE_NESTED_BACKDOOR_L0 241
 
 struct kvm_irq_routing_irqchip {
 	__u32 irqchip;
diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm
index 4277b983cace..9eea93b330e4 100644
--- a/tools/testing/selftests/kvm/Makefile.kvm
+++ b/tools/testing/selftests/kvm/Makefile.kvm
@@ -90,6 +90,7 @@ TEST_GEN_PROGS_x86 += x86/sync_regs_test
 TEST_GEN_PROGS_x86 += x86/ucna_injection_test
 TEST_GEN_PROGS_x86 += x86/userspace_io_test
 TEST_GEN_PROGS_x86 += x86/userspace_msr_exit_test
+TEST_GEN_PROGS_x86 += x86/vmware_hypercall_test
 TEST_GEN_PROGS_x86 += x86/vmx_apic_access_test
 TEST_GEN_PROGS_x86 += x86/vmx_close_while_nested_test
 TEST_GEN_PROGS_x86 += x86/vmx_dirty_log_test
diff --git a/tools/testing/selftests/kvm/x86/vmware_hypercall_test.c b/tools/testing/selftests/kvm/x86/vmware_hypercall_test.c
new file mode 100644
index 000000000000..8daca272933c
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86/vmware_hypercall_test.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * vmware_hypercall_test
+ *
+ * Copyright (c) 2025 Broadcom. All Rights Reserved. The term
+ * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
+ *
+ * Based on:
+ *    xen_vmcall_test.c
+ *
+ *    Copyright © 2020 Amazon.com, Inc. or its affiliates.
+ *
+ * VMware hypercall testing
+ */
+
+#include "test_util.h"
+#include "kvm_util.h"
+#include "processor.h"
+
+#define ARGVALUE(x) (0xdeadbeef5a5a0000UL + (x))
+#define RETVALUE(x) (0xcafef00dfbfbffffUL + (x))
+
+static void guest_code(void)
+{
+	uint64_t error_code;
+	uint8_t vector;
+
+	unsigned long rax = ARGVALUE(1);
+	unsigned long rbx = ARGVALUE(2);
+	unsigned long rcx = ARGVALUE(3);
+	unsigned long rdx = ARGVALUE(4);
+	unsigned long rsi = ARGVALUE(5);
+	unsigned long rdi = ARGVALUE(6);
+	register unsigned long rbp __asm__("rbp") = ARGVALUE(7);
+
+	asm volatile(KVM_ASM_SAFE("vmcall")
+		     : "=a"(rax),  "=b"(rbx), "=c"(rcx), "=d"(rdx),
+		       "=S"(rsi), "=D"(rdi),
+		       KVM_ASM_SAFE_OUTPUTS(vector, error_code)
+		     : "a"(rax), "b"(rbx), "c"(rcx), "d"(rdx),
+		       "S"(rsi), "D"(rdi), "r"(rbp)
+		     : KVM_ASM_SAFE_CLOBBERS);
+	GUEST_ASSERT_EQ(rax, RETVALUE(11));
+	GUEST_ASSERT_EQ(rbx, RETVALUE(12));
+	GUEST_ASSERT_EQ(rcx, RETVALUE(13));
+	GUEST_ASSERT_EQ(rdx, RETVALUE(14));
+	GUEST_ASSERT_EQ(rsi, RETVALUE(15));
+	GUEST_ASSERT_EQ(rdi, RETVALUE(16));
+	GUEST_ASSERT_EQ(vector, 12);
+	GUEST_ASSERT_EQ(error_code, 14);
+	GUEST_DONE();
+}
+
+int main(int argc, char *argv[])
+{
+	struct kvm_vcpu *vcpu;
+	struct kvm_vm *vm;
+
+	if (!kvm_check_cap(KVM_CAP_X86_VMWARE_HYPERCALL)) {
+		print_skip("KVM_CAP_X86_VMWARE_HYPERCALL not available");
+		exit(KSFT_SKIP);
+	}
+
+	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+
+	vm_enable_cap(vm, KVM_CAP_X86_VMWARE_HYPERCALL, 1);
+
+	for (;;) {
+		struct kvm_run *run = vcpu->run;
+		struct ucall uc;
+
+		vcpu_run(vcpu);
+
+		if (run->exit_reason == KVM_EXIT_VMWARE) {
+			struct kvm_regs regs;
+
+			TEST_ASSERT_EQ(run->vmware.type, KVM_EXIT_VMWARE_HCALL);
+			TEST_ASSERT_EQ(run->vmware.hcall.longmode, 1);
+			TEST_ASSERT_EQ(run->vmware.hcall.cpl, 0);
+			TEST_ASSERT_EQ(run->vmware.hcall.rax, ARGVALUE(1));
+			TEST_ASSERT_EQ(run->vmware.hcall.rbx, ARGVALUE(2));
+			TEST_ASSERT_EQ(run->vmware.hcall.rcx, ARGVALUE(3));
+			TEST_ASSERT_EQ(run->vmware.hcall.rdx, ARGVALUE(4));
+			TEST_ASSERT_EQ(run->vmware.hcall.rsi, ARGVALUE(5));
+			TEST_ASSERT_EQ(run->vmware.hcall.rdi, ARGVALUE(6));
+			TEST_ASSERT_EQ(run->vmware.hcall.rbp, ARGVALUE(7));
+
+			run->vmware.hcall.exception.inject = 1;
+			run->vmware.hcall.exception.vector = 12;
+			run->vmware.hcall.exception.error_code = 14;
+			run->vmware.hcall.exception.address = 0;
+
+			run->vmware.hcall.result = RETVALUE(11);
+			vcpu_regs_get(vcpu, &regs);
+			regs.rbx = RETVALUE(12);
+			regs.rcx = RETVALUE(13);
+			regs.rdx = RETVALUE(14);
+			regs.rsi = RETVALUE(15);
+			regs.rdi = RETVALUE(16);
+			vcpu_regs_set(vcpu, &regs);
+			continue;
+		}
+
+		TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
+
+		switch (get_ucall(vcpu, &uc)) {
+		case UCALL_ABORT:
+			REPORT_GUEST_ASSERT(uc);
+			/* NOT REACHED */
+		case UCALL_SYNC:
+			break;
+		case UCALL_DONE:
+			goto done;
+		default:
+			TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);
+		}
+	}
+done:
+	kvm_vm_free(vm);
+	return 0;
+}
-- 
2.48.1

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ