KVM: SVM: Compile sev.c if and only if CONFIG_KVM_AMD_SEV=y

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Stop compiling sev.c when CONFIG_KVM_AMD_SEV=n, as the number of #ifdefs
in sev.c is getting ridiculous, and having #ifdefs inside of SEV helpers
is quite confusing.

To minimize #ifdefs in code flows, #ifdef away only the kvm_x86_ops hooks
and the #VMGEXIT handler. Stubs are also restricted to functions that
check sev_enabled and to the destruction functions sev_free_cpu() and
sev_vm_destroy(), where the style of their callers is to leave checks
to the callers.  Most call sites instead rely on dead code elimination
to take care of functions that are guarded with sev_guest() or
sev_es_guest().

Signed-off-by: Sean Christopherson <seanjc@google.com>
Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20240404121327.3107131-3-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

This commit is contained in:

Paolo Bonzini 2024-04-04 08:13:12 -04:00

parent 1ff3c89032

commit 0d7bf5e5b0

4 changed files with 38 additions and 43 deletions

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7

arch/x86/kvm/Makefile

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24

arch/x86/kvm/svm/sev.c

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5

arch/x86/kvm/svm/svm.c

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45

arch/x86/kvm/svm/svm.h

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