diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2021-10-12 11:07:59 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-27 09:59:47 +0200 |
| commit | 4988e000b3a8fba70cc31ce826829bb6cf8c7838 (patch) | |
| tree | e491dbb73a558be7806483d1c2e50ec39cb0230d /arch | |
| parent | 727286b23f93bf0f459c323a7470ac23a96f52a2 (diff) | |
KVM: SEV-ES: fix length of string I/O
commit 019057bd73d1751fdfec41e43148baf3303d98f9 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/svm/sev.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 4fd8ae3d4915..b7b0c34d9761 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2591,7 +2591,7 @@ 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) |