[PATCH 5/5] powerpc: using reset hcall when kvm,has-reset

Bharat Bhushan
2013-07-15T11:11:19Z

Detect the availability of the reset hcalls by looking at kvm,has-reset
property on the /hypervisor node in the device tree passed to the VM and
patches the reset mechanism to use reset hcall.

This patch uses the reser hcall when kvm,has-reset is there in

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
---
arch/powerpc/kernel/epapr_paravirt.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/epapr_paravirt.c b/arch/powerpc/kernel/epapr_paravirt.c
index d44a571..651d701 100644
--- a/arch/powerpc/kernel/epapr_paravirt.c
+++ b/arch/powerpc/kernel/epapr_paravirt.c
@@ -22,6 +22,8 @@
#include <asm/cacheflush.h>
#include <asm/code-patching.h>
#include <asm/machdep.h>
+#include <asm/kvm_para.h>
+#include <asm/kvm_host.h>

#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
extern void epapr_ev_idle(void);
@@ -30,6 +32,14 @@ extern u32 epapr_ev_idle_start[];

bool epapr_paravirt_enabled;

+void epapr_hypercall_reset(char *cmd)
+{
+ long ret;
+ ret = kvm_hypercall0(KVM_HC_VM_RESET);
+ printk("error: system reset returned with error %ld\n", ret);
+ BUG();
+}
+
static int __init epapr_paravirt_init(void)
{
struct device_node *hyper_node;
@@ -58,6 +68,8 @@ static int __init epapr_paravirt_init(void)
if (of_get_property(hyper_node, "has-idle", NULL))
ppc_md.power_save = epapr_ev_idle;
#endif
+ if (of_get_property(hyper_node, "kvm,has-reset", NULL))
+ ppc_md.restart = epapr_hypercall_reset;

epapr_paravirt_enabled = true;

--
1.7.0.4