linux-kernel - [PATCH 4/6] KVM: selftests: Make Hyper-V guest OS ID common

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Date:   Fri,  4 Nov 2022 21:57:02 -0700
From:   Vipin Sharma <vipinsh@...gle.com>
To:     seanjc@...gle.com, pbonzini@...hat.com, vkuznets@...hat.com
Cc:     dmatlack@...gle.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Vipin Sharma <vipinsh@...gle.com>
Subject: [PATCH 4/6] KVM: selftests: Make Hyper-V guest OS ID common

Make guest OS ID calculation common to all hyperv tests and similar to
hv_generate_guest_id().

Signed-off-by: Vipin Sharma <vipinsh@...gle.com>
---
 tools/testing/selftests/kvm/include/x86_64/hyperv.h  | 10 ++++++++++
 tools/testing/selftests/kvm/x86_64/hyperv_clock.c    |  2 +-
 tools/testing/selftests/kvm/x86_64/hyperv_features.c |  6 ++----
 tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c |  2 +-
 4 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/x86_64/hyperv.h b/tools/testing/selftests/kvm/include/x86_64/hyperv.h
index 075fd29071a6..9d8c325af1d9 100644
--- a/tools/testing/selftests/kvm/include/x86_64/hyperv.h
+++ b/tools/testing/selftests/kvm/include/x86_64/hyperv.h
@@ -9,6 +9,10 @@
 #ifndef SELFTEST_KVM_HYPERV_H
 #define SELFTEST_KVM_HYPERV_H
 
+#include <linux/version.h>
+
+#define HV_LINUX_VENDOR_ID			0x8100
+
 #define HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS	0x40000000
 #define HYPERV_CPUID_INTERFACE			0x40000001
 #define HYPERV_CPUID_VERSION			0x40000002
@@ -189,4 +193,10 @@
 /* hypercall options */
 #define HV_HYPERCALL_FAST_BIT		BIT(16)
 
+static inline uint64_t hv_linux_guest_id(void)
+{
+	return ((uint64_t)HV_LINUX_VENDOR_ID << 48) |
+	       ((uint64_t)LINUX_VERSION_CODE << 16);
+}
+
 #endif /* !SELFTEST_KVM_HYPERV_H */
diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_clock.c b/tools/testing/selftests/kvm/x86_64/hyperv_clock.c
index d576bc8ce823..f9112c5dc3f7 100644
--- a/tools/testing/selftests/kvm/x86_64/hyperv_clock.c
+++ b/tools/testing/selftests/kvm/x86_64/hyperv_clock.c
@@ -104,7 +104,7 @@ static void guest_main(struct ms_hyperv_tsc_page *tsc_page, vm_paddr_t tsc_page_
 
 	/* Set Guest OS id to enable Hyper-V emulation */
 	GUEST_SYNC(1);
-	wrmsr(HV_X64_MSR_GUEST_OS_ID, (u64)0x8100 << 48);
+	wrmsr(HV_X64_MSR_GUEST_OS_ID, hv_linux_guest_id());
 	GUEST_SYNC(2);
 
 	check_tsc_msr_rdtsc();
diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_features.c b/tools/testing/selftests/kvm/x86_64/hyperv_features.c
index 6b443ce456b6..b5a42cf1ad9d 100644
--- a/tools/testing/selftests/kvm/x86_64/hyperv_features.c
+++ b/tools/testing/selftests/kvm/x86_64/hyperv_features.c
@@ -13,8 +13,6 @@
 #include "processor.h"
 #include "hyperv.h"
 
-#define LINUX_OS_ID ((u64)0x8100 << 48)
-
 static inline uint8_t hypercall(u64 control, vm_vaddr_t input_address,
 				vm_vaddr_t output_address, uint64_t *hv_status)
 {
@@ -71,7 +69,7 @@ static void guest_hcall(vm_vaddr_t pgs_gpa, struct hcall_data *hcall)
 
 	GUEST_ASSERT(hcall->control);
 
-	wrmsr(HV_X64_MSR_GUEST_OS_ID, LINUX_OS_ID);
+	wrmsr(HV_X64_MSR_GUEST_OS_ID, hv_linux_guest_id());
 	wrmsr(HV_X64_MSR_HYPERCALL, pgs_gpa);
 
 	if (!(hcall->control & HV_HYPERCALL_FAST_BIT)) {
@@ -169,7 +167,7 @@ static void guest_test_msrs_access(void)
 			 */
 			msr->idx = HV_X64_MSR_GUEST_OS_ID;
 			msr->write = 1;
-			msr->write_val = LINUX_OS_ID;
+			msr->write_val = hv_linux_guest_id();
 			msr->available = 1;
 			break;
 		case 3:
diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c
index a380ad7bb9b3..2c13a144b04c 100644
--- a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c
+++ b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c
@@ -69,7 +69,7 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm)
 
 	GUEST_SYNC(1);
 
-	wrmsr(HV_X64_MSR_GUEST_OS_ID, (u64)0x8100 << 48);
+	wrmsr(HV_X64_MSR_GUEST_OS_ID, hv_linux_guest_id());
 
 	GUEST_ASSERT(svm->vmcb_gpa);
 	/* Prepare for L2 execution. */
-- 
2.38.1.273.g43a17bfeac-goog