linux-kernel - [PATCH] powerpc/xive: store server for masked interrupt in kvmppc_xive_set

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Date:   Thu, 23 Nov 2017 10:06:33 +0100
From:   Laurent Vivier <lvivier@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linuxppc-dev@...ts.ozlabs.org, kvm-ppc@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...abs.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Huth <thuth@...hat.com>,
        Sam Bobroff <sbobroff@...hat.com>,
        Laurent Vivier <lvivier@...hat.com>
Subject: [PATCH] powerpc/xive: store server for masked interrupt in kvmppc_xive_set_xive()

This is needed to map kvmppc_xive_set_xive() behavior
to kvmppc_xics_set_xive().

As we store the server, kvmppc_xive_get_xive() can return
the good value and we can also allow kvmppc_xive_int_on().

Signed-off-by: Laurent Vivier <lvivier@...hat.com>
---
 arch/powerpc/kvm/book3s_xive.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c
index bf457843e032..2781b8733038 100644
--- a/arch/powerpc/kvm/book3s_xive.c
+++ b/arch/powerpc/kvm/book3s_xive.c
@@ -584,10 +584,14 @@ int kvmppc_xive_set_xive(struct kvm *kvm, u32 irq, u32 server,
 	 *       we could initialize interrupts with valid default
 	 */
 
-	if (new_act_prio != MASKED &&
-	    (state->act_server != server ||
-	     state->act_priority != new_act_prio))
-		rc = xive_target_interrupt(kvm, state, server, new_act_prio);
+	if (state->act_server != server ||
+	    state->act_priority != new_act_prio) {
+		if (new_act_prio != MASKED)
+			rc = xive_target_interrupt(kvm, state, server,
+						   new_act_prio);
+		if (!rc)
+			state->act_server = server;
+	}
 
 	/*
 	 * Perform the final unmasking of the interrupt source
@@ -646,14 +650,6 @@ int kvmppc_xive_int_on(struct kvm *kvm, u32 irq)
 
 	pr_devel("int_on(irq=0x%x)\n", irq);
 
-	/*
-	 * Check if interrupt was not targetted
-	 */
-	if (state->act_priority == MASKED) {
-		pr_devel("int_on on untargetted interrupt\n");
-		return -EINVAL;
-	}
-
 	/* If saved_priority is 0xff, do nothing */
 	if (state->saved_priority == MASKED)
 		return 0;
-- 
2.13.6