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kvm: Print MSR information if KVM_{GET,SET}_MSRS failed 

When a KVM_{GET,SET}_MSRS ioctl() fails, it is difficult to find
out which MSR caused the problem. Print an error message for
debugging, before we trigger the (ret == cpu->kvm_msr_buf->nmsrs)
assert.

Suggested-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20170309194634.28457-1-ehabkost@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eduardo Habkost 2017-03-09 16:46:34 -03:00 committed by Paolo Bonzini
parent 79ca7a1b89
commit c70b11d160
1 changed files with 12 additions and 0 deletions
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12
target/i386/kvm.c
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@ -1824,6 +1824,12 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
return ret;
}
if (ret < cpu->kvm_msr_buf->nmsrs) {
struct kvm_msr_entry *e = &cpu->kvm_msr_buf->entries[ret];
error_report("error: failed to set MSR 0x%" PRIx32 " to 0x%" PRIx64,
(uint32_t)e->index, (uint64_t)e->data);
}
assert(ret == cpu->kvm_msr_buf->nmsrs);
return 0;
}
@ -2189,6 +2195,12 @@ static int kvm_get_msrs(X86CPU *cpu)
return ret;
}
if (ret < cpu->kvm_msr_buf->nmsrs) {
struct kvm_msr_entry *e = &cpu->kvm_msr_buf->entries[ret];
error_report("error: failed to get MSR 0x%" PRIx32,
(uint32_t)e->index);
}
assert(ret == cpu->kvm_msr_buf->nmsrs);
/*
* MTRR masks: Each mask consists of 5 parts