KVM: PPC: Book3S HV: Handle guest using doorbells for IPIs

* 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>

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 5a99831..1248b40 100644 (file)
--- 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 (file)
--- 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