KVM: PPC: Book3S HV: Handle H_DOORBELL on the guest exit path

Currently a CPU running a guest can receive a H_DOORBELL in the
following two cases:
1) When the CPU is napping due to CEDE or there not being a guest
vcpu.
2) The CPU is running the guest vcpu.

Case 1), the doorbell message is not cleared since we were waking up
from nap. Hence when the EE bit gets set on transition from guest to
host, the H_DOORBELL interrupt is delivered to the host and the
corresponding handler is invoked.

However in Case 2), the message gets cleared by the action of taking
the H_DOORBELL interrupt. Since the CPU was running a guest, instead
of invoking the doorbell handler, the code invokes the second-level
interrupt handler to switch the context from the guest to the host. At
this point the setting of the EE bit doesn't result in the CPU getting
the doorbell interrupt since it has already been delivered once. So,
the handler for this doorbell is never invoked!

This causes softlockups if the missed DOORBELL was an IPI sent from a
sibling subcore on the same CPU.

This patch fixes it by explitly invoking the doorbell handler on the
exit path if the exit reason is H_DOORBELL similar to the way an
EXTERNAL interrupt is handled. Since this will also handle Case 1), we
can unconditionally clear the doorbell message in
kvmppc_check_wake_reason.

Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 14 insertions, 3 deletions

diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index fb8d29650612..b1dab8d1d885 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -150,6 +150,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
         cmpwi   cr1, r12, BOOK3S_INTERRUPT_MACHINE_CHECK
         cmpwi   r12, BOOK3S_INTERRUPT_EXTERNAL
         beq     11f
+        cmpwi   r12, BOOK3S_INTERRUPT_H_DOORBELL
+        beq     15f     /* Invoke the H_DOORBELL handler */
         cmpwi   cr2, r12, BOOK3S_INTERRUPT_HMI
         beq     cr2, 14f                        /* HMI check */
 
@@ -174,6 +176,10 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
         mtspr   SPRN_HSRR1, r7
         b       hmi_exception_after_realmode
 
+15:     mtspr SPRN_HSRR0, r8
+        mtspr SPRN_HSRR1, r7
+        ba    0xe80
+
 kvmppc_primary_no_guest:
         /* We handle this much like a ceded vcpu */
         /* put the HDEC into the DEC, since HDEC interrupts don't wake us */
@@ -2440,14 +2446,19 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
 
         /* hypervisor doorbell */
 3:      li      r12, BOOK3S_INTERRUPT_H_DOORBELL
+
+        /*
+         * Clear the doorbell as we will invoke the handler
+         * explicitly in the guest exit path.
+         */
+        lis     r6, (PPC_DBELL_SERVER << (63-36))@h
+        PPC_MSGCLR(6)
         /* see if it's a host IPI */
         li      r3, 1
         lbz     r0, HSTATE_HOST_IPI(r13)
         cmpwi   r0, 0
         bnelr
-        /* if not, clear it and return -1 */
-        lis     r6, (PPC_DBELL_SERVER << (63-36))@h
-        PPC_MSGCLR(6)
+        /* if not, return -1 */
         li      r3, -1
         blr