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b=Mi4uJMx+Tzxlc317GCGjjYByCSIx4CRAb9F+1rLe5m0V1gcfgDpPpTkv4njcwER/IuKdgw n1eQY4r7MEww1sSvTgdrnicBCtUrjz5GVeF6busJFhIgKsP2gxltYDgr324nDtfkkFEQlT 3lnf5d9So7MOWnIgzqSrcr94YejtnnU= X-MC-Unique: pRuptWf_MJOET5fk6_Tffg-1 From: Vitaly Kuznetsov To: qemu-devel@nongnu.org Subject: [PATCH] target/i386: Fix VM migration when interrupt based APF is enabled Date: Thu, 17 Sep 2020 12:23:16 +0200 Message-Id: <20200917102316.814804-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=vkuznets@redhat.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=63.128.21.124; envelope-from=vkuznets@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/16 20:51:18 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -50 X-Spam_score: -5.1 X-Spam_bar: ----- X-Spam_report: (-5.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.999, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Marcelo Tosatti , Eduardo Habkost , "Dr. David Alan Gilbert" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" VM with interrupt based APF enabled fails to migrate: qemu-system-x86_64: error: failed to set MSR 0x4b564d02 to 0xf3 We have two issues: 1) There is a typo in kvm_put_msrs() and we write async_pf_int_msr to MSR_KVM_ASYNC_PF_EN (instead of MSR_KVM_ASYNC_PF_INT) 2) We restore MSR_KVM_ASYNC_PF_EN before MSR_KVM_ASYNC_PF_INT is set and this violates the check in KVM. Re-order MSR_KVM_ASYNC_PF_EN/MSR_KVM_ASYNC_PF_INT setting (and kvm_get_msrs() for consistency) and fix the typo. Signed-off-by: Vitaly Kuznetsov --- This fixes queued but not yet pushed to git commit "target/i386: support KVM_FEATURE_ASYNC_PF_INT" --- target/i386/kvm.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/target/i386/kvm.c b/target/i386/kvm.c index b26370662075..4a8b3a41c1bc 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -2818,12 +2818,12 @@ static int kvm_put_msrs(X86CPU *cpu, int level) kvm_msr_entry_add(cpu, MSR_IA32_TSC, env->tsc); kvm_msr_entry_add(cpu, MSR_KVM_SYSTEM_TIME, env->system_time_msr); kvm_msr_entry_add(cpu, MSR_KVM_WALL_CLOCK, env->wall_clock_msr); + if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF_INT)) { + kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_INT, env->async_pf_int= _msr); + } if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF)) { kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_EN, env->async_pf_en_m= sr); } - if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF_INT)) { - kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_EN, env->async_pf_int_= msr); - } if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_PV_EOI)) { kvm_msr_entry_add(cpu, MSR_KVM_PV_EOI_EN, env->pv_eoi_en_msr); } @@ -3206,12 +3206,12 @@ static int kvm_get_msrs(X86CPU *cpu) #endif kvm_msr_entry_add(cpu, MSR_KVM_SYSTEM_TIME, 0); kvm_msr_entry_add(cpu, MSR_KVM_WALL_CLOCK, 0); - if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF)) { - kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_EN, 0); - } if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF_INT)) { kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_INT, 0); } + if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_ASYNC_PF)) { + kvm_msr_entry_add(cpu, MSR_KVM_ASYNC_PF_EN, 0); + } if (env->features[FEAT_KVM] & (1 << KVM_FEATURE_PV_EOI)) { kvm_msr_entry_add(cpu, MSR_KVM_PV_EOI_EN, 0); } --=20 2.25.4