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KVM: SEV: WARN if KVM attempts to setup scratch area with min_len==0

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Now that all paths in KVM properly validate the length needed for the
scratch area, and are guaranteed to pass in a non-zero length, WARN if KVM
attempts to configured the scratch area with min_len==0 to guard against
future bugs.

Cc: stable@vger.kernel.org
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260501202250.2115252-8-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2026-05-01 13:22:32 -07:00 committed by Paolo Bonzini
parent 5867d7e202
commit f185e05dce
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/svm/sev.c
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@ -3669,6 +3669,9 @@ static int setup_vmgexit_scratch(struct vcpu_svm *svm, bool sync, u64 min_len)
u64 scratch_gpa_beg, scratch_gpa_end;
void *scratch_va;
if (WARN_ON_ONCE(!min_len))
goto e_scratch;
scratch_gpa_beg = svm->sev_es.sw_scratch;
if (!scratch_gpa_beg) {
pr_err("vmgexit: scratch gpa not provided\n");