[Xen-devel] [PATCH v5 02/15] x86/cpu: Fix common cpuid faulting probing for AMD and Hygon

[Pu Wen <puwen@xxxxxxxx>]

There is no MSR_INTEL_PLATFORM_INFO for AMD and Hygon families. Read
this MSR will stop the Xen initialization process in some Hygon
systems or produce GPF(0). So directly return false in the function
probe_cpuid_faulting() if !cpu_has_hypervisor.

Signed-off-by: Pu Wen <puwen@xxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/cpu/common.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xen/arch/x86/cpu/common.c b/xen/arch/x86/cpu/common.c
index 74c9426..1a095fc 100644
--- a/xen/arch/x86/cpu/common.c
+++ b/xen/arch/x86/cpu/common.c
@@ -116,6 +116,11 @@ bool __init probe_cpuid_faulting(void)
        uint64_t val;
        int rc;
 
+       if ((boot_cpu_data.x86_vendor == X86_VENDOR_HYGON ||
+            boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
+           !cpu_has_hypervisor)
+               return false;
+
        if ((rc = rdmsr_safe(MSR_INTEL_PLATFORM_INFO, val)) == 0)
                raw_msr_policy.plaform_info.cpuid_faulting =
                        val & MSR_PLATFORM_INFO_CPUID_FAULTING;
-- 
2.7.4


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