leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

KVM: svm: avic: Add support for dynamic setup/teardown of virtual APIC backing page

Browse Source 
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>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Suravee Suthikulpanit 2019-11-14 14:15:09 -06:00 committed by Paolo Bonzini
parent 8937d76239
commit dcbcfa287e
1 changed files with 5 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/x86/kvm/svm.c
View File

@ -1729,23 +1729,22 @@ 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;
@ -1758,7 +1757,7 @@ 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;