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OpenCloudOS-Kernel
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KVM: SVM: Check for SVM support in CPU compatibility checks 

Check that SVM is supported and enabled in the processor compatibility
checks.  SVM already checks for support during hardware enabling,
i.e. this doesn't really add new functionality.  The net effect is that
KVM will refuse to load if a CPU doesn't have SVM fully enabled, as
opposed to failing KVM_CREATE_VM.

Opportunistically move svm_check_processor_compat() up in svm.c so that
it can be invoked during hardware enabling in a future patch.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221130230934.1014142-39-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-11-30 23:09:22 +00:00 committed by Paolo Bonzini
parent 8504ef2139
commit 325fc9579c
1 changed files with 8 additions and 5 deletions
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13
arch/x86/kvm/svm/svm.c
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@ -543,6 +543,14 @@ static bool kvm_is_svm_supported(void)
return true;
}
static int __init svm_check_processor_compat(void)
{
if (!kvm_is_svm_supported())
return -EIO;
return 0;
}
void __svm_write_tsc_multiplier(u64 multiplier)
{
preempt_disable();
@ -4093,11 +4101,6 @@ svm_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
hypercall[2] = 0xd9;
}
static int __init svm_check_processor_compat(void)
{
return 0;
}
/*
* The kvm parameter can be NULL (module initialization, or invocation before
* VM creation). Be sure to check the kvm parameter before using it.