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Subject[PATCH 1/2] kvm, Add x86_hyper_kvm to complete detect_hypervisor_platform check [v2]
Date
While debugging I noticed that unlike all the other hypervisor code in the
kernel, kvm does not have an entry for x86_hyper which is used in
detect_hypervisor_platform() which results in a nice printk in the
syslog. This is only really a stub function but it
does make kvm more consistent with the other hypervisors.

[v2]: add detect and _GPL export

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
arch/x86/include/asm/hypervisor.h | 1 +
arch/x86/kernel/cpu/hypervisor.c | 1 +
arch/x86/kernel/kvm.c | 14 ++++++++++++++
3 files changed, 16 insertions(+)

diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h
index 7a15153..b518c75 100644
--- a/arch/x86/include/asm/hypervisor.h
+++ b/arch/x86/include/asm/hypervisor.h
@@ -49,6 +49,7 @@ extern const struct hypervisor_x86 *x86_hyper;
extern const struct hypervisor_x86 x86_hyper_vmware;
extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
extern const struct hypervisor_x86 x86_hyper_xen_hvm;
+extern const struct hypervisor_x86 x86_hyper_kvm;

static inline bool hypervisor_x2apic_available(void)
{
diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
index 755f64f..6d6dd7a 100644
--- a/arch/x86/kernel/cpu/hypervisor.c
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -37,6 +37,7 @@ static const __initconst struct hypervisor_x86 * const hypervisors[] =
#endif
&x86_hyper_vmware,
&x86_hyper_ms_hyperv,
+ &x86_hyper_kvm,
};

const struct hypervisor_x86 *x86_hyper;
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index e554e5a..865cd13 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -39,6 +39,7 @@
#include <asm/desc.h>
#include <asm/tlbflush.h>
#include <asm/idle.h>
+#include <asm/hypervisor.h>

static int kvmapf = 1;

@@ -432,6 +433,19 @@ void __init kvm_guest_init(void)
#endif
}

+static bool __init kvm_detect(void)
+{
+ if (!kvm_para_available())
+ return false;
+ return true;
+}
+
+const struct hypervisor_x86 x86_hyper_kvm __refconst = {
+ .name = "KVM",
+ .detect = kvm_detect,
+};
+EXPORT_SYMBOL_GPL(x86_hyper_kvm);
+
static __init int activate_jump_labels(void)
{
if (has_steal_clock) {
--
1.7.9.3


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