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KVM: PPC: ev_idle hcall support for e500 guests 

Signed-off-by: Liu Yu <yu.liu@freescale.com>
[varun: 64-bit changes]
Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Liu Yu-B13201 2012-07-03 05:48:53 +00:00 committed by Alexander Graf
parent 9202e07636
commit 2f979de8a7
3 changed files with 44 additions and 6 deletions
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11
arch/powerpc/include/asm/epapr_hcalls.h
View File

@ -50,10 +50,6 @@
#ifndef _EPAPR_HCALLS_H
#define _EPAPR_HCALLS_H
#include <linux/types.h>
#include <linux/errno.h>
#include <asm/byteorder.h>
#define EV_BYTE_CHANNEL_SEND 1
#define EV_BYTE_CHANNEL_RECEIVE 2
#define EV_BYTE_CHANNEL_POLL 3
@ -109,6 +105,11 @@
#define EV_UNIMPLEMENTED 12 /* Unimplemented hypercall */
#define EV_BUFFER_OVERFLOW 13 /* Caller-supplied buffer too small */
#ifndef __ASSEMBLY__
#include <linux/types.h>
#include <linux/errno.h>
#include <asm/byteorder.h>
/*
* Hypercall register clobber list
*
@ -506,5 +507,5 @@ static inline unsigned int ev_idle(void)
return r3;
}
#endif /* !__ASSEMBLY__ */
#endif

28
arch/powerpc/kernel/epapr_hcalls.S
View File

@ -8,13 +8,41 @@
*/
#include <linux/threads.h>
#include <asm/epapr_hcalls.h>
#include <asm/reg.h>
#include <asm/page.h>
#include <asm/cputable.h>
#include <asm/thread_info.h>
#include <asm/ppc_asm.h>
#include <asm/asm-compat.h>
#include <asm/asm-offsets.h>
/* epapr_ev_idle() was derived from e500_idle() */
_GLOBAL(epapr_ev_idle)
CURRENT_THREAD_INFO(r3, r1)
PPC_LL r4, TI_LOCAL_FLAGS(r3) /* set napping bit */
ori r4, r4,_TLF_NAPPING /* so when we take an exception */
PPC_STL r4, TI_LOCAL_FLAGS(r3) /* it will return to our caller */
wrteei 1
idle_loop:
LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
.global epapr_ev_idle_start
epapr_ev_idle_start:
li r3, -1
nop
nop
nop
/*
* Guard against spurious wakeups from a hypervisor --
* only interrupt will cause us to return to LR due to
* _TLF_NAPPING.
*/
b idle_loop
/* Hypercall entry point. Will be patched with device tree instructions. */
.global epapr_hypercall_start
epapr_hypercall_start:

11
arch/powerpc/kernel/epapr_paravirt.c
View File

@ -21,6 +21,10 @@
#include <asm/epapr_hcalls.h>
#include <asm/cacheflush.h>
#include <asm/code-patching.h>
#include <asm/machdep.h>
extern void epapr_ev_idle(void);
extern u32 epapr_ev_idle_start[];
bool epapr_paravirt_enabled;
@ -41,8 +45,13 @@ static int __init epapr_paravirt_init(void)
if (len % 4 || len > (4 * 4))
return -ENODEV;
for (i = 0; i < (len / 4); i++)
for (i = 0; i < (len / 4); i++) {
patch_instruction(epapr_hypercall_start + i, insts[i]);
patch_instruction(epapr_ev_idle_start + i, insts[i]);
}
if (of_get_property(hyper_node, "has-idle", NULL))
ppc_md.power_save = epapr_ev_idle;
epapr_paravirt_enabled = true;