KVM: PPC: Book3S HV: Add more barriers in XIVE load/unload code

On POWER9 systems, we push the VCPU context onto the XIVE (eXternal
Interrupt Virtualization Engine) hardware when entering a guest,
and pull the context off the XIVE when exiting the guest.  The push
is done with cache-inhibited stores, and the pull with cache-inhibited
loads.

Testing has revealed that it is possible (though very rare) for
the stores to get reordered with the loads so that we end up with the
guest VCPU context still loaded on the XIVE after we have exited the
guest.  When that happens, it is possible for the same VCPU context
to then get loaded on another CPU, which causes the machine to
checkstop.

To fix this, we add I/O barrier instructions (eieio) before and
after the push and pull operations.  As partial compensation for the
potential slowdown caused by the extra barriers, we remove the eieio
instructions between the two stores in the push operation, and between
the two loads in the pull operation.  (The architecture requires
loads to cache-inhibited, guarded storage to be kept in order, and
requires stores to cache-inhibited, guarded storage likewise to be
kept in order, but allows such loads and stores to be reordered with
respect to each other.)

Reported-by: Carol L Soto <clsoto@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index c700bedccaab..42639fba89e8 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -989,13 +989,14 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_300)
         beq     no_xive
         ld      r11, VCPU_XIVE_SAVED_STATE(r4)
         li      r9, TM_QW1_OS
-        stdcix  r11,r9,r10
         eieio
+        stdcix  r11,r9,r10
         lwz     r11, VCPU_XIVE_CAM_WORD(r4)
         li      r9, TM_QW1_OS + TM_WORD2
         stwcix  r11,r9,r10
         li      r9, 1
         stw     r9, VCPU_XIVE_PUSHED(r4)
+        eieio
 no_xive:
 #endif /* CONFIG_KVM_XICS */
 
@@ -1401,8 +1402,8 @@ guest_exit_cont:		/* r9 = vcpu, r12 = trap, r13 = paca */
         cmpldi  cr0, r10, 0
         beq     1f
         /* First load to pull the context, we ignore the value */
-        lwzx    r11, r7, r10
         eieio
+        lwzx    r11, r7, r10
         /* Second load to recover the context state (Words 0 and 1) */
         ldx     r11, r6, r10
         b       3f
@@ -1410,8 +1411,8 @@ guest_exit_cont:		/* r9 = vcpu, r12 = trap, r13 = paca */
         cmpldi  cr0, r10, 0
         beq     1f
         /* First load to pull the context, we ignore the value */
-        lwzcix  r11, r7, r10
         eieio
+        lwzcix  r11, r7, r10
         /* Second load to recover the context state (Words 0 and 1) */
         ldcix   r11, r6, r10
 3:      std     r11, VCPU_XIVE_SAVED_STATE(r9)
@@ -1421,6 +1422,7 @@ guest_exit_cont:		/* r9 = vcpu, r12 = trap, r13 = paca */
         stw     r10, VCPU_XIVE_PUSHED(r9)
         stb     r10, (VCPU_XIVE_SAVED_STATE+3)(r9)
         stb     r0, (VCPU_XIVE_SAVED_STATE+4)(r9)
+        eieio
 1:
 #endif /* CONFIG_KVM_XICS */
         /* Save more register state  */