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i386: kvm: Add support for MSR filtering

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KVM has grown support to deflect arbitrary MSRs to user space since
Linux 5.10. For now we don't expect to make a lot of use of this
feature, so let's expose it the easiest way possible: With up to 16
individually maskable MSRs.

This patch adds a kvm_filter_msr() function that other code can call
to install a hook on KVM MSR reads or writes.

Signed-off-by: Alexander Graf <agraf@csgraf.de>
Message-Id: <20221004225643.65036-3-agraf@csgraf.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alexander Graf 2022-10-05 00:56:42 +02:00 • committed by Paolo Bonzini
parent 62a44fddb2
commit 860054d8ce
2 changed files with 134 additions and 0 deletions
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11
target/i386/kvm/kvm_i386.h
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@ -54,4 +54,15 @@ uint64_t kvm_swizzle_msi_ext_dest_id(uint64_t address);
bool kvm_enable_sgx_provisioning(KVMState *s);
void kvm_request_xsave_components(X86CPU *cpu, uint64_t mask);
typedef bool QEMURDMSRHandler(X86CPU *cpu, uint32_t msr, uint64_t *val);
typedef bool QEMUWRMSRHandler(X86CPU *cpu, uint32_t msr, uint64_t val);
typedef struct kvm_msr_handlers {
uint32_t msr;
QEMURDMSRHandler *rdmsr;
QEMUWRMSRHandler *wrmsr;
} KVMMSRHandlers;
bool kvm_filter_msr(KVMState *s, uint32_t msr, QEMURDMSRHandler *rdmsr,
QEMUWRMSRHandler *wrmsr);
#endif