Re: [PATCH 1/8] KVM: SEV-ES: fix length of string I/O

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On 10/13/21 11:56 AM, Paolo Bonzini wrote:
The size of the data in the scratch buffer is not divided by the size of
each port I/O operation, so vcpu->arch.pio.count ends up being larger
than it should be by a factor of size.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 7ed9abfe8e9f ("KVM: SVM: Support string IO operations for an SEV-ES guest")
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>

Ugh, can't believe I did that...

Acked-by: Tom Lendacky <thomas.lendacky@xxxxxxx>

---
  arch/x86/kvm/svm/sev.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index c36b5fe4c27c..e672493b5d8d 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -2583,7 +2583,7 @@ int sev_es_string_io(struct vcpu_svm *svm, int size, unsigned int port, int in)
  		return -EINVAL;
return kvm_sev_es_string_io(&svm->vcpu, size, port,
-				    svm->ghcb_sa, svm->ghcb_sa_len, in);
+				    svm->ghcb_sa, svm->ghcb_sa_len / size, in);
  }
void sev_es_init_vmcb(struct vcpu_svm *svm)




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