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From: Andre Przywara <andre.przywara@arm.com>
To: Stefano Stabellini <sstabellini@kernel.org>,
	Julien Grall <julien.grall@arm.com>
Cc: xen-devel@lists.xenproject.org,
	Shanker Donthineni <shankerd@codeaurora.org>,
	Vijay Kilari <vijay.kilari@gmail.com>
Subject: [PATCH v2 10/27] ARM: GICv3: forward pending LPIs to guests
Date: Thu, 16 Mar 2017 11:20:13 +0000	[thread overview]
Message-ID: <20170316112030.20419-11-andre.przywara@arm.com> (raw)
In-Reply-To: <20170316112030.20419-1-andre.przywara@arm.com>

Upon receiving an LPI, we need to find the right VCPU and virtual IRQ
number to get this IRQ injected.
Iterate our two-level LPI table to find this information quickly when
the host takes an LPI. Call the existing injection function to let the
GIC emulation deal with this interrupt.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 xen/arch/arm/gic-v3-lpi.c | 41 +++++++++++++++++++++++++++++++++++++++++
 xen/arch/arm/gic.c        |  6 ++++--
 xen/include/asm-arm/irq.h |  8 ++++++++
 3 files changed, 53 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/gic-v3-lpi.c b/xen/arch/arm/gic-v3-lpi.c
index 59d3ba4..0579976 100644
--- a/xen/arch/arm/gic-v3-lpi.c
+++ b/xen/arch/arm/gic-v3-lpi.c
@@ -104,6 +104,47 @@ uint64_t gicv3_get_redist_address(unsigned int cpu, bool use_pta)
         return per_cpu(lpi_redist, cpu).redist_id << 16;
 }
 
+/*
+ * Handle incoming LPIs, which are a bit special, because they are potentially
+ * numerous and also only get injected into guests. Treat them specially here,
+ * by just looking up their target vCPU and virtual LPI number and hand it
+ * over to the injection function.
+ */
+void do_LPI(unsigned int lpi)
+{
+    struct domain *d;
+    union host_lpi *hlpip, hlpi;
+    struct vcpu *vcpu;
+
+    WRITE_SYSREG32(lpi, ICC_EOIR1_EL1);
+
+    hlpip = gic_get_host_lpi(lpi);
+    if ( !hlpip )
+        return;
+
+    hlpi.data = read_u64_atomic(&hlpip->data);
+
+    /* We may have mapped more host LPIs than the guest actually asked for. */
+    if ( !hlpi.virt_lpi )
+        return;
+
+    d = get_domain_by_id(hlpi.dom_id);
+    if ( !d )
+        return;
+
+    if ( hlpi.vcpu_id >= d->max_vcpus )
+    {
+        put_domain(d);
+        return;
+    }
+
+    vcpu = d->vcpu[hlpi.vcpu_id];
+
+    put_domain(d);
+
+    vgic_vcpu_inject_irq(vcpu, hlpi.virt_lpi);
+}
+
 static int gicv3_lpi_allocate_pendtable(uint64_t *reg)
 {
     uint64_t val;
diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index bd3c032..7286e5d 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -700,8 +700,10 @@ void gic_interrupt(struct cpu_user_regs *regs, int is_fiq)
             local_irq_enable();
             do_IRQ(regs, irq, is_fiq);
             local_irq_disable();
-        }
-        else if (unlikely(irq < 16))
+        } else if ( is_lpi(irq) )
+        {
+            do_LPI(irq);
+        } else if ( unlikely(irq < 16) )
         {
             do_sgi(regs, irq);
         }
diff --git a/xen/include/asm-arm/irq.h b/xen/include/asm-arm/irq.h
index 8f7a167..ee47de8 100644
--- a/xen/include/asm-arm/irq.h
+++ b/xen/include/asm-arm/irq.h
@@ -34,6 +34,14 @@ struct irq_desc *__irq_to_desc(int irq);
 
 void do_IRQ(struct cpu_user_regs *regs, unsigned int irq, int is_fiq);
 
+#ifdef CONFIG_HAS_ITS
+void do_LPI(unsigned int irq);
+#else
+static inline void do_LPI(unsigned int irq)
+{
+}
+#endif
+
 #define domain_pirq_to_irq(d, pirq) (pirq)
 
 bool_t is_assignable_irq(unsigned int irq);
-- 
2.9.0


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  parent reply	other threads:[~2017-03-16 11:19 UTC|newest]

Thread overview: 119+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-16 11:20 [PATCH v2 00/27] arm64: Dom0 ITS emulation Andre Przywara
2017-03-16 11:20 ` [PATCH v2 01/27] ARM: GICv3 ITS: parse and store ITS subnodes from hardware DT Andre Przywara
2017-03-21 20:17   ` Julien Grall
2017-03-23 10:57     ` Andre Przywara
2017-03-23 17:32       ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 02/27] ARM: GICv3: allocate LPI pending and property table Andre Przywara
2017-03-21 21:23   ` Julien Grall
2017-03-23 14:40     ` Andre Przywara
2017-03-23 17:42       ` Julien Grall
2017-03-23 17:45         ` Stefano Stabellini
2017-03-23 17:49           ` Julien Grall
2017-03-23 18:01             ` Stefano Stabellini
2017-03-23 18:21               ` Andre Przywara
2017-03-24 11:45                 ` Julien Grall
2017-03-24 17:22                   ` Stefano Stabellini
2017-03-21 22:57   ` Stefano Stabellini
2017-03-21 23:08     ` André Przywara
2017-03-21 23:27       ` Stefano Stabellini
2017-03-23 10:50         ` Andre Przywara
2017-03-23 17:47           ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 03/27] ARM: GICv3 ITS: allocate device and collection table Andre Przywara
2017-03-21 23:29   ` Stefano Stabellini
2017-03-22 13:52   ` Julien Grall
2017-03-22 16:08     ` André Przywara
2017-03-22 16:33       ` Julien Grall
2017-03-29 13:58         ` Andre Przywara
2017-03-16 11:20 ` [PATCH v2 04/27] ARM: GICv3 ITS: map ITS command buffer Andre Przywara
2017-03-21 23:48   ` Stefano Stabellini
2017-03-22 15:23   ` Julien Grall
2017-03-22 16:31     ` André Przywara
2017-03-22 16:41       ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 05/27] ARM: GICv3 ITS: introduce ITS command handling Andre Przywara
2017-03-16 15:05   ` Shanker Donthineni
2017-03-16 15:18     ` Andre Przywara
2017-03-22  0:02   ` Stefano Stabellini
2017-03-22 15:59   ` Julien Grall
2017-04-03 10:58     ` Andre Przywara
2017-04-03 11:23       ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 06/27] ARM: GICv3 ITS: introduce device mapping Andre Przywara
2017-03-22 17:29   ` Julien Grall
2017-04-03 20:08     ` Andre Przywara
2017-04-03 20:41       ` Julien Grall
2017-04-04  9:57         ` Andre Przywara
2017-03-22 22:45   ` Stefano Stabellini
2017-04-03 19:45     ` Andre Przywara
2017-03-30 11:17   ` Vijay Kilari
2017-03-16 11:20 ` [PATCH v2 07/27] ARM: arm64: activate atomic 64-bit accessors Andre Przywara
2017-03-22 17:30   ` Julien Grall
2017-03-22 22:49     ` Stefano Stabellini
2017-03-16 11:20 ` [PATCH v2 08/27] ARM: GICv3 ITS: introduce host LPI array Andre Przywara
2017-03-22 23:38   ` Stefano Stabellini
2017-03-23  8:48     ` Julien Grall
2017-03-23 10:21     ` Andre Przywara
2017-03-23 17:52       ` Stefano Stabellini
2017-03-24 11:54         ` Julien Grall
2017-03-23 19:08   ` Julien Grall
2017-04-03 19:30     ` Andre Przywara
2017-04-03 20:13       ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 09/27] ARM: GICv3: introduce separate pending_irq structs for LPIs Andre Przywara
2017-03-22 23:44   ` Stefano Stabellini
2017-03-23 20:08     ` André Przywara
2017-03-24 10:59       ` Julien Grall
2017-03-24 11:40   ` Julien Grall
2017-03-24 15:50     ` Andre Przywara
2017-03-24 16:19       ` Julien Grall
2017-03-24 17:26       ` Stefano Stabellini
2017-03-27  9:02         ` Andre Przywara
2017-03-27 14:01           ` Julien Grall
2017-03-27 17:44             ` Stefano Stabellini
2017-03-27 17:49               ` Julien Grall
2017-03-27 18:39                 ` Stefano Stabellini
2017-03-27 21:24                   ` Julien Grall
2017-03-28  7:58                   ` Jan Beulich
2017-03-28 13:12                     ` Julien Grall
2017-03-28 13:34                       ` Jan Beulich
2017-03-16 11:20 ` Andre Przywara [this message]
2017-03-24 12:03   ` [PATCH v2 10/27] ARM: GICv3: forward pending LPIs to guests Julien Grall
2017-04-03 14:18     ` Andre Przywara
2017-04-04 11:49       ` Julien Grall
2017-04-04 12:51         ` Andre Przywara
2017-04-04 12:50           ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 11/27] ARM: GICv3: enable ITS and LPIs on the host Andre Przywara
2017-03-16 11:20 ` [PATCH v2 12/27] ARM: vGICv3: handle virtual LPI pending and property tables Andre Przywara
2017-03-24 12:09   ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 13/27] ARM: vGICv3: Handle disabled LPIs Andre Przywara
2017-03-24 12:20   ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 14/27] ARM: vGICv3: introduce basic ITS emulation bits Andre Przywara
2017-03-16 16:25   ` Shanker Donthineni
2017-03-20 12:17     ` Vijay Kilari
2017-03-24 12:41   ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 15/27] ARM: vITS: introduce translation table walks Andre Przywara
2017-03-24 13:00   ` Julien Grall
2017-04-03 18:25     ` Andre Przywara
2017-04-04 15:59       ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 16/27] ARM: vITS: handle CLEAR command Andre Przywara
2017-03-24 14:27   ` Julien Grall
2017-03-24 15:53     ` Andre Przywara
2017-03-24 17:17       ` Stefano Stabellini
2017-03-27  8:44         ` Andre Przywara
2017-03-27 14:12           ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 17/27] ARM: vITS: handle INT command Andre Przywara
2017-03-24 14:38   ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 18/27] ARM: vITS: handle MAPC command Andre Przywara
2017-03-16 11:20 ` [PATCH v2 19/27] ARM: vITS: handle MAPD command Andre Przywara
2017-03-24 14:41   ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 20/27] ARM: vITS: handle MAPTI command Andre Przywara
2017-03-24 14:54   ` Julien Grall
2017-04-03 18:47     ` Andre Przywara
2017-03-16 11:20 ` [PATCH v2 21/27] ARM: vITS: handle MOVI command Andre Przywara
2017-03-24 15:00   ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 22/27] ARM: vITS: handle DISCARD command Andre Przywara
2017-03-16 11:20 ` [PATCH v2 23/27] ARM: vITS: handle INV command Andre Przywara
2017-03-16 11:20 ` [PATCH v2 24/27] ARM: vITS: handle INVALL command Andre Przywara
2017-03-24 15:12   ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 25/27] ARM: vITS: create and initialize virtual ITSes for Dom0 Andre Przywara
2017-03-24 15:18   ` Julien Grall
2017-03-16 11:20 ` [PATCH v2 26/27] ARM: vITS: create ITS subnodes for Dom0 DT Andre Przywara
2017-03-16 11:20 ` [PATCH v2 27/27] ARM: vGIC: advertise LPI support Andre Przywara
2017-03-24 15:25   ` Julien Grall

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