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svm: Introduce AMD IOMMU avic_ga_log_notifier 

This patch introduces avic_ga_log_notifier, which will be called
by IOMMU driver whenever it handles the Guest vAPIC (GA) log entry.

Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Suravee Suthikulpanit 2016-08-23 13:52:42 -05:00 committed by Paolo Bonzini
parent 5ea11f2b31
commit 5881f73757
2 changed files with 69 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/include/asm/kvm_host.h
View File

@ -785,6 +785,7 @@ struct kvm_arch {
u32 ldr_mode;
struct page *avic_logical_id_table_page;
struct page *avic_physical_id_table_page;
struct hlist_node hnode;
bool x2apic_format;
bool x2apic_broadcast_quirk_disabled;

70
arch/x86/kvm/svm.c
View File

@ -34,6 +34,8 @@
#include <linux/sched.h>
#include <linux/trace_events.h>
#include <linux/slab.h>
#include <linux/amd-iommu.h>
#include <linux/hashtable.h>
#include <asm/apic.h>
#include <asm/perf_event.h>
@ -945,6 +947,55 @@ static void svm_disable_lbrv(struct vcpu_svm *svm)
set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
}
/* Note:
* This hash table is used to map VM_ID to a struct kvm_arch,
* when handling AMD IOMMU GALOG notification to schedule in
* a particular vCPU.
*/
#define SVM_VM_DATA_HASH_BITS 8
DECLARE_HASHTABLE(svm_vm_data_hash, SVM_VM_DATA_HASH_BITS);
static spinlock_t svm_vm_data_hash_lock;
/* Note:
* This function is called from IOMMU driver to notify
* SVM to schedule in a particular vCPU of a particular VM.
*/
static int avic_ga_log_notifier(u32 ga_tag)
{
unsigned long flags;
struct kvm_arch *ka = NULL;
struct kvm_vcpu *vcpu = NULL;
u32 vm_id = AVIC_GATAG_TO_VMID(ga_tag);
u32 vcpu_id = AVIC_GATAG_TO_VCPUID(ga_tag);
pr_debug("SVM: %s: vm_id=%#x, vcpu_id=%#x\n", __func__, vm_id, vcpu_id);
spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
hash_for_each_possible(svm_vm_data_hash, ka, hnode, vm_id) {
struct kvm *kvm = container_of(ka, struct kvm, arch);
struct kvm_arch *vm_data = &kvm->arch;
if (vm_data->avic_vm_id != vm_id)
continue;
vcpu = kvm_get_vcpu_by_id(kvm, vcpu_id);
break;
}
spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);
if (!vcpu)
return 0;
/* Note:
* At this point, the IOMMU should have already set the pending
* bit in the vAPIC backing page. So, we just need to schedule
* in the vcpu.
*/
if (vcpu->mode == OUTSIDE_GUEST_MODE)
kvm_vcpu_wake_up(vcpu);
return 0;
}
static __init int svm_hardware_setup(void)
{
int cpu;
@ -1003,10 +1054,15 @@ static __init int svm_hardware_setup(void)
if (avic) {
if (!npt_enabled ||
!boot_cpu_has(X86_FEATURE_AVIC) ||
!IS_ENABLED(CONFIG_X86_LOCAL_APIC))
!IS_ENABLED(CONFIG_X86_LOCAL_APIC)) {
avic = false;
else
} else {
pr_info("AVIC enabled\n");
hash_init(svm_vm_data_hash);
spin_lock_init(&svm_vm_data_hash_lock);
amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
}
}
return 0;
@ -1327,6 +1383,7 @@ static inline int avic_free_vm_id(int id)
static void avic_vm_destroy(struct kvm *kvm)
{
unsigned long flags;
struct kvm_arch *vm_data = &kvm->arch;
avic_free_vm_id(vm_data->avic_vm_id);
@ -1335,10 +1392,15 @@ static void avic_vm_destroy(struct kvm *kvm)
__free_page(vm_data->avic_logical_id_table_page);
if (vm_data->avic_physical_id_table_page)
__free_page(vm_data->avic_physical_id_table_page);
spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
hash_del(&vm_data->hnode);
spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);
}
static int avic_vm_init(struct kvm *kvm)
{
unsigned long flags;
int err = -ENOMEM;
struct kvm_arch *vm_data = &kvm->arch;
struct page *p_page;
@ -1367,6 +1429,10 @@ static int avic_vm_init(struct kvm *kvm)
vm_data->avic_logical_id_table_page = l_page;
clear_page(page_address(l_page));
spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
hash_add(svm_vm_data_hash, &vm_data->hnode, vm_data->avic_vm_id);
spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);
return 0;
free_avic: