linux-kernel - [PATCH v2 10/15] kvm: x86: hyperv: Use APICv deactivate request interface

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Date:   Thu, 15 Aug 2019 16:25:15 +0000
From:   "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
CC:     "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "graf@...zon.com" <graf@...zon.com>,
        "jschoenh@...zon.de" <jschoenh@...zon.de>,
        "karahmed@...zon.de" <karahmed@...zon.de>,
        "rimasluk@...zon.com" <rimasluk@...zon.com>,
        "Grimm, Jon" <Jon.Grimm@....com>,
        "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>
Subject: [PATCH v2 10/15] kvm: x86: hyperv: Use APICv deactivate request
 interface

Since disabling APICv has to be done for all vcpus on AMD-based system,
adopt the newly introduced kvm_make_apicv_deactivate_request() intereface.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 arch/x86/kvm/hyperv.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index a39e38f..4f71a39 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -772,9 +772,17 @@ int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages)
 
 	/*
 	 * Hyper-V SynIC auto EOI SINT's are
-	 * not compatible with APICV, so deactivate APICV
+	 * not compatible with APICV, so  request
+	 * to deactivate APICV permanently.
+	 *
+	 * Since this requires updating
+	 * APIC_ACCESS_PAGE_PRIVATE_MEMSLOT,
+	 * also take srcu lock.
 	 */
-	kvm_vcpu_deactivate_apicv(vcpu);
+	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
+	kvm_make_apicv_deactivate_request(vcpu, true);
+	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
+
 	synic->active = true;
 	synic->dont_zero_synic_pages = dont_zero_synic_pages;
 	return 0;
-- 
1.8.3.1