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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jun 2022 23:15:09.0921 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0e5c9583-bab6-42fc-d8bd-08da5312b83c X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT064.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB3549 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Michael Roth Signed-off-by: Michael Roth --- arch/x86/kvm/svm/svm.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index fced6ea423ad..f78e3b1bde0e 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -1352,7 +1352,7 @@ static void svm_vcpu_free(struct kvm_vcpu *vcpu) static void svm_prepare_switch_to_guest(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); - struct svm_cpu_data *sd = per_cpu(svm_data, vcpu->cpu); + struct svm_cpu_data *sd; if (sev_es_guest(vcpu->kvm)) sev_es_unmap_ghcb(svm); @@ -1360,6 +1360,10 @@ static void svm_prepare_switch_to_guest(struct kvm_vcpu *vcpu) if (svm->guest_state_loaded) return; + /* sev_es_unmap_ghcb() can resched, so grab per-cpu pointer afterward. */ + barrier(); + sd = per_cpu(svm_data, vcpu->cpu); + /* * Save additional host state that will be restored on VMEXIT (sev-es) * or subsequent vmload of host save area.