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Subject[PATCH v2 14/17] arm64: Detect async PF para-virtualization feature
Date
This implements kvm_para_available() to check if para-virtualization
features are available or not. Besides, kvm_para_has_feature() is
enhanced to detect the asynchronous page fault para-virtualization
feature. These two functions are going to be used by guest kernel
to enable the asynchronous page fault.

This also adds kernel option (CONFIG_KVM_GUEST), which is the umbrella
for the optimizations related to KVM para-virtualization.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
arch/arm64/Kconfig | 11 +++++++++++
arch/arm64/include/asm/kvm_para.h | 12 +++++++++++-
arch/arm64/include/uapi/asm/kvm_para.h | 2 ++
3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index f39568b28ec1..792ae09aa690 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1078,6 +1078,17 @@ config PARAVIRT_TIME_ACCOUNTING

If in doubt, say N here.

+config KVM_GUEST
+ bool "KVM Guest Support"
+ depends on PARAVIRT
+ default y
+ help
+ This option enables various optimizations for running under the KVM
+ hypervisor. Overhead for the kernel when not running inside KVM should
+ be minimal.
+
+ In case of doubt, say Y
+
config KEXEC
depends on PM_SLEEP_SMP
select KEXEC_CORE
diff --git a/arch/arm64/include/asm/kvm_para.h b/arch/arm64/include/asm/kvm_para.h
index 0ea481dd1c7a..8f39c60a6619 100644
--- a/arch/arm64/include/asm/kvm_para.h
+++ b/arch/arm64/include/asm/kvm_para.h
@@ -3,6 +3,8 @@
#define _ASM_ARM_KVM_PARA_H

#include <uapi/asm/kvm_para.h>
+#include <linux/of.h>
+#include <asm/hypervisor.h>

static inline bool kvm_check_and_clear_guest_paused(void)
{
@@ -11,7 +13,12 @@ static inline bool kvm_check_and_clear_guest_paused(void)

static inline unsigned int kvm_arch_para_features(void)
{
- return 0;
+ unsigned int features = 0;
+
+ if (kvm_arm_hyp_service_available(ARM_SMCCC_KVM_FUNC_ASYNC_PF))
+ features |= (1 << KVM_FEATURE_ASYNC_PF);
+
+ return features;
}

static inline unsigned int kvm_arch_para_hints(void)
@@ -21,6 +28,9 @@ static inline unsigned int kvm_arch_para_hints(void)

static inline bool kvm_para_available(void)
{
+ if (IS_ENABLED(CONFIG_KVM_GUEST))
+ return true;
+
return false;
}

diff --git a/arch/arm64/include/uapi/asm/kvm_para.h b/arch/arm64/include/uapi/asm/kvm_para.h
index 162325e2638f..70bbc7d1ec75 100644
--- a/arch/arm64/include/uapi/asm/kvm_para.h
+++ b/arch/arm64/include/uapi/asm/kvm_para.h
@@ -4,6 +4,8 @@

#include <linux/types.h>

+#define KVM_FEATURE_ASYNC_PF 0
+
/* Async PF */
#define KVM_ASYNC_PF_ENABLED (1 << 0)
#define KVM_ASYNC_PF_SEND_ALWAYS (1 << 1)
--
2.23.0
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