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LoongArch: KVM: Implement function kvm_para_has_feature()

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Implement function kvm_para_has_feature() to detect supported paravirt
features. It can be used by device driver to detect and enable paravirt
features, such as the EIOINTC irqchip driver is able to detect feature
KVM_FEATURE_VIRT_EXTIOI and do some optimization.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao
2024-09-12 22:56:14 +08:00
committed by Huacai Chen
parent cdc118f802
commit 3abb708ec0
2 changed files with 27 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/loongarch/include/asm/kvm_para.h
+10
View File
@@ -156,10 +156,20 @@ static __always_inline long kvm_hypercall5(u64 fid,
return ret;
}
#ifdef CONFIG_PARAVIRT
bool kvm_para_available(void);
unsigned int kvm_arch_para_features(void);
#else
static inline bool kvm_para_available(void)
{
return false;
}
static inline unsigned int kvm_arch_para_features(void)
{
return 0;
}
#endif
static inline unsigned int kvm_arch_para_hints(void)
{
arch/loongarch/kernel/paravirt.c
+17 -15
View File
@@ -152,11 +152,14 @@ static void pv_init_ipi(void)
}
#endif
static bool kvm_para_available(void)
bool kvm_para_available(void)
{
int config;
static int hypervisor_type;
if (!cpu_has_hypervisor)
return false;
if (!hypervisor_type) {
config = read_cpucfg(CPUCFG_KVM_SIG);
if (!memcmp(&config, KVM_SIGNATURE, 4))
@@ -166,17 +169,22 @@ static bool kvm_para_available(void)
return hypervisor_type == HYPERVISOR_KVM;
}
int __init pv_ipi_init(void)
unsigned int kvm_arch_para_features(void)
{
int feature;
static unsigned int feature;
if (!cpu_has_hypervisor)
return 0;
if (!kvm_para_available())
return 0;
feature = read_cpucfg(CPUCFG_KVM_FEATURE);
if (!(feature & BIT(KVM_FEATURE_IPI)))
if (!feature)
feature = read_cpucfg(CPUCFG_KVM_FEATURE);
return feature;
}
int __init pv_ipi_init(void)
{
if (!kvm_para_has_feature(KVM_FEATURE_IPI))
return 0;
#ifdef CONFIG_SMP
@@ -259,15 +267,9 @@ static struct notifier_block pv_reboot_nb = {
int __init pv_time_init(void)
{
int r, feature;
int r;
if (!cpu_has_hypervisor)
return 0;
if (!kvm_para_available())
return 0;
feature = read_cpucfg(CPUCFG_KVM_FEATURE);
if (!(feature & BIT(KVM_FEATURE_STEAL_TIME)))
if (!kvm_para_has_feature(KVM_FEATURE_STEAL_TIME))
return 0;
has_steal_clock = 1;