Commit 43d05de2 authored Apr 14, 2020 by Eric Northup Committed by Paolo Bonzini Apr 15, 2020

KVM: pass through CPUID(0x80000006)



Return the host's L2 cache and TLB information for CPUID.0x80000006
instead of zeroing out the entry as part of KVM_GET_SUPPORTED_CPUID.
This allows a userspace VMM to feed KVM_GET_SUPPORTED_CPUID's output
directly into KVM_SET_CPUID2 (without breaking the guest).

Signed-off-by: Eric Northup (Google) <digitaleric@gmail.com>
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Jon Cargille <jcargill@google.com>
Message-Id: <20200415012320.236065-1-jcargill@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 24647e0a

arch/x86/kvm/cpuid.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -728,6 +728,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
		cpuid_entry_override(entry, CPUID_8000_0001_EDX);
		cpuid_entry_override(entry, CPUID_8000_0001_ECX);
		break;
		case 0x80000006:
		/* L2 cache and TLB: pass through host info. */
		break;
		case 0x80000007: /* Advanced power management */
		/* invariant TSC is CPUID.80000007H:EDX[8] */
		entry->edx &= (1 << 8);

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