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KVM: x86: Add infrastructure for MSR filtering

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In the following commits we will add pieces of MSR filtering.
To ensure that code compiles even with the feature half-merged, let's add
a few stubs and struct definitions before the real patches start.

Signed-off-by: Alexander Graf <graf@amazon.com>

Message-Id: <20200925143422.21718-4-graf@amazon.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alexander Graf 2020-09-25 16:34:17 +02:00 committed by Paolo Bonzini
parent 1ae099540e
commit 51de8151bd
4 changed files with 10 additions and 0 deletions
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1
arch/x86/include/asm/kvm_host.h
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@ -1235,6 +1235,7 @@ struct kvm_x86_ops {
int (*enable_direct_tlbflush)(struct kvm_vcpu *vcpu);
void (*migrate_timers)(struct kvm_vcpu *vcpu);
void (*msr_filter_changed)(struct kvm_vcpu *vcpu);
};
struct kvm_x86_nested_ops {

2
arch/x86/include/uapi/asm/kvm.h
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@ -192,6 +192,8 @@ struct kvm_msr_list {
__u32 indices[0];
};
#define KVM_MSR_FILTER_READ (1 << 0)
#define KVM_MSR_FILTER_WRITE (1 << 1)
struct kvm_cpuid_entry {
__u32 function;

6
arch/x86/kvm/x86.c
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@ -1488,6 +1488,12 @@ void kvm_enable_efer_bits(u64 mask)
}
EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
bool kvm_msr_allowed(struct kvm_vcpu *vcpu, u32 index, u32 type)
{
return true;
}
EXPORT_SYMBOL_GPL(kvm_msr_allowed);
/*
* Write @data into the MSR specified by @index. Select MSR specific fault
* checks are bypassed if @host_initiated is %true.

1
arch/x86/kvm/x86.h
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@ -374,6 +374,7 @@ bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu);
int kvm_handle_memory_failure(struct kvm_vcpu *vcpu, int r,
struct x86_exception *e);
int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva);
bool kvm_msr_allowed(struct kvm_vcpu *vcpu, u32 index, u32 type);
#define KVM_MSR_RET_INVALID 2