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authorPaolo Bonzini <pbonzini@redhat.com>2021-10-12 11:07:59 -0400
committerPaolo Bonzini <pbonzini@redhat.com>2021-10-15 04:47:36 -0400
commit019057bd73d1751fdfec41e43148baf3303d98f9 (patch)
tree28dfb7d5ddd48e4d36a5a9c01fd65b3e4ff7789a /arch/x86
parent2353e593a13ba76c82921940471ce442fe498927 (diff)
downloadlinux-019057bd73d1751fdfec41e43148baf3303d98f9.tar.bz2
KVM: SEV-ES: fix length of string I/O
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") Acked-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/svm/sev.c2
1 files changed, 1 insertions, 1 deletions
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)