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KVM: x86/mmu: Capture TDP level when updating CPUID

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Snapshot the TDP level now that it's invariant (SVM) or dependent only
on host capabilities and guest CPUID (VMX).  This avoids having to call
kvm_x86_ops.get_tdp_level() when initializing a TDP MMU and/or
calculating the page role, and thus avoids the associated retpoline.

Drop the WARN in vmx_get_tdp_level() as updating CPUID while L2 is
active is legal, if dodgy.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200502043234.12481-11-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2020-05-01 21:32:34 -07:00
committed by Paolo Bonzini
parent 0047fcade4
commit e93fd3b3e8
5 changed files with 7 additions and 7 deletions
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arch/x86/include/asm/kvm_host.h
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@@ -687,6 +687,7 @@ struct kvm_vcpu_arch {
struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
int maxphyaddr;
int tdp_level;
/* emulate context */