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KVM: x86: Add module parameter for supporting VMware backdoor

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Support access to VMware backdoor requires KVM to intercept #GP
exceptions from guest which introduce slight performance hit.
Therefore, control this support by module parameter.

Note that module parameter is exported as it should be consumed by
kvm_intel & kvm_amd to determine if they should intercept #GP or not.

This commit doesn't change semantics.
It is done as a preparation for future commits.

Signed-off-by: Liran Alon <liran.alon@oracle.com>
Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Liran Alon 2018-03-12 13:12:47 +02:00 committed by Paolo Bonzini
parent dca7f1284f
commit c4ae60e4bb
3 changed files with 9 additions and 0 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
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@ -1887,6 +1887,9 @@
kvm.ignore_msrs=[KVM] Ignore guest accesses to unhandled MSRs.
Default is 0 (don't ignore, but inject #GP)
kvm.enable_vmware_backdoor=[KVM] Support VMware backdoor PV interface.
Default is false (don't support).
kvm.mmu_audit= [KVM] This is a R/W parameter which allows audit
KVM MMU at runtime.
Default is 0 (off)

4
arch/x86/kvm/x86.c
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@ -142,6 +142,10 @@ module_param(lapic_timer_advance_ns, uint, S_IRUGO | S_IWUSR);
static bool __read_mostly vector_hashing = true;
module_param(vector_hashing, bool, S_IRUGO);
bool __read_mostly enable_vmware_backdoor = false;
module_param(enable_vmware_backdoor, bool, S_IRUGO);
EXPORT_SYMBOL_GPL(enable_vmware_backdoor);
#define KVM_NR_SHARED_MSRS 16
struct kvm_shared_msrs_global {

2
arch/x86/kvm/x86.h
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@ -242,6 +242,8 @@ extern unsigned int min_timer_period_us;
extern unsigned int lapic_timer_advance_ns;
extern bool enable_vmware_backdoor;
extern struct static_key kvm_no_apic_vcpu;
static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec)