[PATCH v5 07/18] svm: Add support for setup/destroy virutal APIC backing page for AVIC

Suravee Suthikulpanit
2019-11-14T20:17:01Z

Re-factor avic_init_access_page() to avic_update_access_page() since
activate/deactivate AVIC requires setting/unsetting the memory region used
for virtual APIC backing page (APIC_ACCESS_PAGE_PRIVATE_MEMSLOT).

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
arch/x86/kvm/svm.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 38401f9..3ffb437 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1673,23 +1673,22 @@ 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_update_access_page(struct kvm *kvm, bool activate)
{
- struct kvm *kvm = vcpu->kvm;
int ret = 0;

mutex_lock(&kvm->slots_lock);
- if (kvm->arch.apic_access_page_done)
+ if (kvm->arch.apic_access_page_done == activate)
goto out;

ret = __x86_set_memory_region(kvm,
APIC_ACCESS_PAGE_PRIVATE_MEMSLOT,
APIC_DEFAULT_PHYS_BASE,
- PAGE_SIZE);
+ activate ? PAGE_SIZE : 0);
if (ret)
goto out;

- kvm->arch.apic_access_page_done = true;
+ kvm->arch.apic_access_page_done = activate;
out:
mutex_unlock(&kvm->slots_lock);
return ret;
@@ -1702,7 +1701,7 @@ 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_update_access_page(vcpu->kvm, true);
if (ret)
return ret;

--
1.8.3.1