linux-kernel - [PATCH 1/5] KVM: x86: selftests: Add CPU vendor detection for Hygon

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Message-ID: <20260120091449.526798-2-zhiquan_li@163.com>
Date: Tue, 20 Jan 2026 17:14:44 +0800
From: Zhiquan Li <zhiquan_li@....com>
To: seanjc@...gle.com,
	pbonzini@...hat.com,
	shuah@...nel.org
Cc: kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	zhiquan_li@....com
Subject: [PATCH 1/5] KVM: x86: selftests: Add CPU vendor detection for Hygon

Currently some KVM selftests are failed on Hygon CPUs due to missing
vendor detection and edge-case handling specific to Hygon's
architecture.

Add CPU vendor detection for Hygon and add a global variable
"host_cpu_is_hygon" as the basic facility for the following fixes.

Signed-off-by: Zhiquan Li <zhiquan_li@....com>
---
 tools/testing/selftests/kvm/include/x86/processor.h | 6 ++++++
 tools/testing/selftests/kvm/lib/x86/processor.c     | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/x86/processor.h b/tools/testing/selftests/kvm/include/x86/processor.h
index 57d62a425109..9ac18e0fca54 100644
--- a/tools/testing/selftests/kvm/include/x86/processor.h
+++ b/tools/testing/selftests/kvm/include/x86/processor.h
@@ -21,6 +21,7 @@
 
 extern bool host_cpu_is_intel;
 extern bool host_cpu_is_amd;
+extern bool host_cpu_is_hygon;
 extern uint64_t guest_tsc_khz;
 
 #ifndef MAX_NR_CPUID_ENTRIES
@@ -701,6 +702,11 @@ static inline bool this_cpu_is_amd(void)
 	return this_cpu_vendor_string_is("AuthenticAMD");
 }
 
+static inline bool this_cpu_is_hygon(void)
+{
+	return this_cpu_vendor_string_is("HygonGenuine");
+}
+
 static inline uint32_t __this_cpu_has(uint32_t function, uint32_t index,
 				      uint8_t reg, uint8_t lo, uint8_t hi)
 {
diff --git a/tools/testing/selftests/kvm/lib/x86/processor.c b/tools/testing/selftests/kvm/lib/x86/processor.c
index 36104d27f3d9..bbd3336f22eb 100644
--- a/tools/testing/selftests/kvm/lib/x86/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86/processor.c
@@ -21,6 +21,7 @@
 vm_vaddr_t exception_handlers;
 bool host_cpu_is_amd;
 bool host_cpu_is_intel;
+bool host_cpu_is_hygon;
 bool is_forced_emulation_enabled;
 uint64_t guest_tsc_khz;
 
@@ -671,6 +672,7 @@ void kvm_arch_vm_post_create(struct kvm_vm *vm, unsigned int nr_vcpus)
 
 	sync_global_to_guest(vm, host_cpu_is_intel);
 	sync_global_to_guest(vm, host_cpu_is_amd);
+	sync_global_to_guest(vm, host_cpu_is_hygon);
 	sync_global_to_guest(vm, is_forced_emulation_enabled);
 	sync_global_to_guest(vm, pmu_errata_mask);
 
@@ -1303,6 +1305,7 @@ void kvm_selftest_arch_init(void)
 {
 	host_cpu_is_intel = this_cpu_is_intel();
 	host_cpu_is_amd = this_cpu_is_amd();
+	host_cpu_is_hygon = this_cpu_is_hygon();
 	is_forced_emulation_enabled = kvm_is_forced_emulation_enabled();
 
 	kvm_init_pmu_errata();
-- 
2.43.0