On Wed, 2021-10-13 at 12:56 -0400, 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@vger.kernel.org Fixes: 7ed9abfe8e9f ("KVM: SVM: Support string IO operations for an SEV-ES guest") Signed-off-by: Paolo Bonzini pbonzini@redhat.com
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)
This ends in kvm_sev_es_ins/outs and both indeed expect count of operations which they pass to emulator_pio_{out|in}_emulated
Reviewed-by: Maxim Levitsky mlevitsk@redhat.com
Best regards, Maxim Levitsky