[PULL 28/36] KVM: PPC: Book3S HV: Handle guest using doorbells for IPIs

Alexander Graf
2014-01-29T16:13:07Z

From: Paul Mackerras <paulus@samba.org>

* SRR1 wake reason field for system reset interrupt on wakeup from nap
is now a 4-bit field on P8, compared to 3 bits on P7.

* Set PECEDP in LPCR when napping because of H_CEDE so guest doorbells
will wake us up.

* Waking up from nap because of a guest doorbell interrupt is not a
reason to exit the guest.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
arch/powerpc/include/asm/reg.h | 4 +++-
arch/powerpc/kvm/book3s_hv_rmhandlers.S | 19 +++++++++++++++----
2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 5a99831..1248b40 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -307,7 +307,9 @@
#define LPCR_ILE 0x02000000 /* !HV irqs set MSR:LE */
#define LPCR_AIL_0 0x00000000 /* MMU off exception offset 0x0 */
#define LPCR_AIL_3 0x01800000 /* MMU on exception offset 0xc00...4xxx */
-#define LPCR_PECE 0x00007000 /* powersave exit cause enable */
+#define LPCR_PECE 0x0001f000 /* powersave exit cause enable */
+#define LPCR_PECEDP 0x00010000 /* directed priv dbells cause exit */
+#define LPCR_PECEDH 0x00008000 /* directed hyp dbells cause exit */
#define LPCR_PECE0 0x00004000 /* ext. exceptions can cause exit */
#define LPCR_PECE1 0x00002000 /* decrementer can cause exit */
#define LPCR_PECE2 0x00001000 /* machine check etc can cause exit */
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index 386e141..9e89c75 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -1857,13 +1857,16 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_206)
bl kvmppc_save_fp

/*
- * Take a nap until a decrementer or external interrupt occurs,
- * with PECE1 (wake on decr) and PECE0 (wake on external) set in LPCR
+ * Take a nap until a decrementer or external or doobell interrupt
+ * occurs, with PECE1, PECE0 and PECEDP set in LPCR
*/
li r0,1
stb r0,HSTATE_HWTHREAD_REQ(r13)
mfspr r5,SPRN_LPCR
ori r5,r5,LPCR_PECE0 | LPCR_PECE1
+BEGIN_FTR_SECTION
+ oris r5,r5,LPCR_PECEDP@h
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
mtspr SPRN_LPCR,r5
isync
li r0, 0
@@ -1979,14 +1982,22 @@ machine_check_realmode:
*/
kvmppc_check_wake_reason:
mfspr r6, SPRN_SRR1
- rlwinm r6, r6, 44-31, 0x7 /* extract wake reason field */
- cmpwi r6, 4 /* was it an external interrupt? */
+BEGIN_FTR_SECTION
+ rlwinm r6, r6, 45-31, 0xf /* extract wake reason field (P8) */
+FTR_SECTION_ELSE
+ rlwinm r6, r6, 45-31, 0xe /* P7 wake reason field is 3 bits */
+ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_207S)
+ cmpwi r6, 8 /* was it an external interrupt? */
li r12, BOOK3S_INTERRUPT_EXTERNAL
beq kvmppc_read_intr /* if so, see what it was */
li r3, 0
li r12, 0
cmpwi r6, 6 /* was it the decrementer? */
beq 0f
+BEGIN_FTR_SECTION
+ cmpwi r6, 5 /* privileged doorbell? */
+ beq 0f
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
li r3, 1 /* anything else, return 1 */
0: blr

--
1.8.1.4