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KVM: SEV: use mutex guard in sev_mem_enc_unregister_region()

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Simplify the error paths in sev_mem_enc_unregister_region() by using a
mutex guard, allowing early return instead of using gotos.

Signed-off-by: Carlos López <clopez@suse.de>
Link: https://patch.msgid.link/20260120201013.3931334-7-clopez@suse.de
Link: https://patch.msgid.link/20260310234829.2608037-19-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Carlos López 2026-03-10 16:48:26 -07:00 committed by Sean Christopherson
parent 63e56d8425
commit 84841f3941
1 changed files with 5 additions and 15 deletions
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20
arch/x86/kvm/svm/sev.c
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@ -2811,35 +2811,25 @@ int sev_mem_enc_unregister_region(struct kvm *kvm,
struct kvm_enc_region *range)
{
struct enc_region *region;
int ret;
/* If kvm is mirroring encryption context it isn't responsible for it */
if (is_mirroring_enc_context(kvm))
return -EINVAL;
mutex_lock(&kvm->lock);
guard(mutex)(&kvm->lock);
if (!sev_guest(kvm)) {
ret = -ENOTTY;
goto failed;
}
if (!sev_guest(kvm))
return -ENOTTY;
region = find_enc_region(kvm, range);
if (!region) {
ret = -EINVAL;
goto failed;
}
if (!region)
return -EINVAL;
sev_writeback_caches(kvm);
__unregister_enc_region_locked(kvm, region);
mutex_unlock(&kvm->lock);
return 0;
failed:
mutex_unlock(&kvm->lock);
return ret;
}
int sev_vm_copy_enc_context_from(struct kvm *kvm, unsigned int source_fd)