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Subject[PATCH v2 13/17] KVM: arm64: Export async PF capability
Date
This exports the asynchronous page fault capability:

* Identify capability KVM_CAP_ASYNC_{PF, PF_INT}.

* Standardize SDEI event for asynchronous page fault.

* Enable kernel config CONFIG_KVM_ASYNC_{PF, PF_SLOT}.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
arch/arm64/include/uapi/asm/kvm_sdei.h | 1 +
arch/arm64/kvm/Kconfig | 2 ++
arch/arm64/kvm/arm.c | 4 ++++
arch/arm64/kvm/sdei.c | 5 +++++
4 files changed, 12 insertions(+)

diff --git a/arch/arm64/include/uapi/asm/kvm_sdei.h b/arch/arm64/include/uapi/asm/kvm_sdei.h
index 232092de5e21..47d578abba1a 100644
--- a/arch/arm64/include/uapi/asm/kvm_sdei.h
+++ b/arch/arm64/include/uapi/asm/kvm_sdei.h
@@ -13,6 +13,7 @@
#define KVM_SDEI_MAX_VCPUS 512
#define KVM_SDEI_INVALID_NUM 0
#define KVM_SDEI_DEFAULT_NUM 0x40400000
+#define KVM_SDEI_ASYNC_PF_NUM 0x40400001

struct kvm_sdei_event_state {
uint64_t num;
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 3964acf5451e..dfb3ed0de2ca 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -31,6 +31,8 @@ menuconfig KVM
select SRCU
select KVM_VFIO
select HAVE_KVM_EVENTFD
+ select KVM_ASYNC_PF
+ select KVM_ASYNC_PF_SLOT
select HAVE_KVM_IRQFD
select HAVE_KVM_MSI
select HAVE_KVM_IRQCHIP
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index be0e6c2db2a5..0940de3ebcff 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -269,6 +269,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_ARM_SDEI:
r = 1;
break;
+ case KVM_CAP_ASYNC_PF:
+ case KVM_CAP_ASYNC_PF_INT:
+ r = IS_ENABLED(CONFIG_KVM_ASYNC_PF) ? 1 : 0;
+ break;
default:
r = 0;
}
diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index 4f5a582daa97..437303bfafba 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -19,6 +19,11 @@ static struct kvm_sdei_event_state defined_kse[] = {
1,
SDEI_EVENT_PRIORITY_CRITICAL
},
+ { KVM_SDEI_ASYNC_PF_NUM,
+ SDEI_EVENT_TYPE_PRIVATE,
+ 1,
+ SDEI_EVENT_PRIORITY_CRITICAL
+ },
};

static struct kvm_sdei_event *kvm_sdei_find_event(struct kvm *kvm,
--
2.23.0
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