From: "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@amd.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Cc: "joro@8bytes.org" <joro@8bytes.org>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"rkrcmar@redhat.com" <rkrcmar@redhat.com>,
"Suthikulpanit, Suravee" <Suravee.Suthikulpanit@amd.com>
Subject: [PATCH 3/6] svm: Add support for APIC_ACCESS_PAGE_PRIVATE_MEMSLOT setup/destroy
Date: Fri, 22 Mar 2019 11:57:31 +0000 [thread overview]
Message-ID: <20190322115702.10166-4-suravee.suthikulpanit@amd.com> (raw)
In-Reply-To: <20190322115702.10166-1-suravee.suthikulpanit@amd.com>
Activate/deactivate AVIC requires setting/unsetting the memory region used
for APIC_ACCESS_PAGE_PRIVATE_MEMSLOT. So, re-factor avic_init_access_page()
to avic_setup_access_page() and add srcu_read_lock/unlock, which are needed
to allow this function to be called during run-time.
Also, introduce avic_destroy_access_page() to unset the page when
deactivate AVIC.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
arch/x86/kvm/svm.c | 28 ++++++++++++++++++++++++++--
1 file changed, 26 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 4cf93a729ad8..f41f34f70dde 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1666,7 +1666,7 @@ static u64 *avic_get_physical_id_entry(struct kvm_vcpu *vcpu,
* field of the VMCB. Therefore, we set up the
* APIC_ACCESS_PAGE_PRIVATE_MEMSLOT (4KB) here.
*/
-static int avic_init_access_page(struct kvm_vcpu *vcpu)
+static int avic_setup_access_page(struct kvm_vcpu *vcpu, bool init)
{
struct kvm *kvm = vcpu->kvm;
int ret = 0;
@@ -1675,10 +1675,14 @@ static int avic_init_access_page(struct kvm_vcpu *vcpu)
if (kvm->arch.apic_access_page_done)
goto out;
+ if (!init)
+ srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
ret = __x86_set_memory_region(kvm,
APIC_ACCESS_PAGE_PRIVATE_MEMSLOT,
APIC_DEFAULT_PHYS_BASE,
PAGE_SIZE);
+ if (!init)
+ vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
if (ret)
goto out;
@@ -1688,6 +1692,26 @@ static int avic_init_access_page(struct kvm_vcpu *vcpu)
return ret;
}
+static void avic_destroy_access_page(struct kvm_vcpu *vcpu)
+{
+ struct kvm *kvm = vcpu->kvm;
+
+ mutex_lock(&kvm->slots_lock);
+
+ if (!kvm->arch.apic_access_page_done)
+ goto out;
+
+ srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
+ __x86_set_memory_region(kvm,
+ APIC_ACCESS_PAGE_PRIVATE_MEMSLOT,
+ APIC_DEFAULT_PHYS_BASE,
+ 0);
+ vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
+ kvm->arch.apic_access_page_done = false;
+out:
+ mutex_unlock(&kvm->slots_lock);
+}
+
static int avic_init_backing_page(struct kvm_vcpu *vcpu)
{
int ret;
@@ -1695,7 +1719,7 @@ static int avic_init_backing_page(struct kvm_vcpu *vcpu)
int id = vcpu->vcpu_id;
struct vcpu_svm *svm = to_svm(vcpu);
- ret = avic_init_access_page(vcpu);
+ ret = avic_setup_access_page(vcpu, true);
if (ret)
return ret;
--
2.17.1
next prev parent reply other threads:[~2019-03-22 11:57 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-22 11:57 [PATCH 0/6] KVM/x86: Add workaround to support ExtINT with AVIC Suthikulpanit, Suravee
2019-03-22 11:57 ` [PATCH 1/6] KVM: x86: Add callback functions for handling APIC ID, DFR and LDR update Suthikulpanit, Suravee
2019-07-03 21:16 ` Paolo Bonzini
2019-07-17 19:44 ` Suthikulpanit, Suravee
2019-03-22 11:57 ` [PATCH 2/6] svm: Add AMD AVIC handlers for " Suthikulpanit, Suravee
2019-03-22 11:57 ` Suthikulpanit, Suravee [this message]
2019-05-08 19:14 ` [PATCH 3/6] svm: Add support for APIC_ACCESS_PAGE_PRIVATE_MEMSLOT setup/destroy Jan H. Schönherr
2019-06-30 16:19 ` Suthikulpanit, Suravee
2019-03-22 11:57 ` [PATCH 4/6] kvm: lapic: Add apicv activate/deactivate helper function Suthikulpanit, Suravee
2019-05-08 22:27 ` Jan H. Schönherr
2019-07-15 22:35 ` Suthikulpanit, Suravee
2019-03-22 11:57 ` [PATCH 5/6] KVM: x86: Add interface for run-time activate/de-activate APIC virtualization Suthikulpanit, Suravee
2019-05-08 20:45 ` Jan H. Schönherr
2019-03-22 11:57 ` [PATCH 6/6] svm: Temporary deactivate AVIC during ExtINT handling Suthikulpanit, Suravee
2019-05-08 17:37 ` Jan H. Schönherr
2019-06-03 18:58 ` Suthikulpanit, Suravee
2019-04-04 21:30 ` [PATCH 0/6] KVM/x86: Add workaround to support ExtINT with AVIC rkrcmar
2019-04-04 22:06 ` rkrcmar
2019-04-04 22:06 ` rkrcmar
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