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From: Andrew Murray <andrew.murray@arm.com>
To: Marc Zyngier <marc.zyngier@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>,
	kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, Mark Rutland <mark.rutland@arm.com>
Subject: [PATCH v2 13/18] perf: arm_spe: Add KVM structure for obtaining IRQ info
Date: Fri, 20 Dec 2019 14:30:20 +0000
Message-ID: <20191220143025.33853-14-andrew.murray@arm.com> (raw)
In-Reply-To: <20191220143025.33853-1-andrew.murray@arm.com>

KVM requires knowledge of the physical SPE IRQ number such that it can
associate it with any virtual IRQ for guests that require SPE emulation.

Let's create a structure to hold this information and an accessor that
KVM can use to retrieve this information.

We expect that each SPE device will have the same physical PPI number
and thus will warn when this is not the case.

Signed-off-by: Andrew Murray <andrew.murray@arm.com>
---
 drivers/perf/arm_spe_pmu.c | 23 +++++++++++++++++++++++
 include/kvm/arm_spe.h      |  6 ++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c
index 4e4984a55cd1..2d24af4cfcab 100644
--- a/drivers/perf/arm_spe_pmu.c
+++ b/drivers/perf/arm_spe_pmu.c
@@ -34,6 +34,9 @@
 #include <linux/smp.h>
 #include <linux/vmalloc.h>
 
+#include <linux/kvm_host.h>
+#include <kvm/arm_spe.h>
+
 #include <asm/barrier.h>
 #include <asm/cpufeature.h>
 #include <asm/mmu.h>
@@ -1127,6 +1130,24 @@ static void arm_spe_pmu_dev_teardown(struct arm_spe_pmu *spe_pmu)
 	free_percpu_irq(spe_pmu->irq, spe_pmu->handle);
 }
 
+#ifdef CONFIG_KVM_ARM_SPE
+static struct arm_spe_kvm_info arm_spe_kvm_info;
+
+struct arm_spe_kvm_info *arm_spe_get_kvm_info(void)
+{
+	return &arm_spe_kvm_info;
+}
+
+static void arm_spe_populate_kvm_info(struct arm_spe_pmu *spe_pmu)
+{
+	WARN_ON_ONCE(arm_spe_kvm_info.physical_irq != 0 &&
+		     arm_spe_kvm_info.physical_irq != spe_pmu->irq);
+	arm_spe_kvm_info.physical_irq = spe_pmu->irq;
+}
+#else
+static void arm_spe_populate_kvm_info(struct arm_spe_pmu *spe_pmu) {}
+#endif
+
 /* Driver and device probing */
 static int arm_spe_pmu_irq_probe(struct arm_spe_pmu *spe_pmu)
 {
@@ -1149,6 +1170,8 @@ static int arm_spe_pmu_irq_probe(struct arm_spe_pmu *spe_pmu)
 	}
 
 	spe_pmu->irq = irq;
+	arm_spe_populate_kvm_info(spe_pmu);
+
 	return 0;
 }
 
diff --git a/include/kvm/arm_spe.h b/include/kvm/arm_spe.h
index d1f3c564dfd0..9c65130d726d 100644
--- a/include/kvm/arm_spe.h
+++ b/include/kvm/arm_spe.h
@@ -17,6 +17,12 @@ struct kvm_spe {
 	bool irq_level;
 };
 
+struct arm_spe_kvm_info {
+	int physical_irq;
+};
+
+struct arm_spe_kvm_info *arm_spe_get_kvm_info(void);
+
 #ifdef CONFIG_KVM_ARM_SPE
 #define kvm_arm_spe_v1_ready(v)		((v)->arch.spe.ready)
 #define kvm_arm_spe_irq_initialized(v)		\
-- 
2.21.0


  parent reply index

Thread overview: 78+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-20 14:30 [PATCH v2 00/18] arm64: KVM: add SPE profiling support Andrew Murray
2019-12-20 14:30 ` [PATCH v2 01/18] dt-bindings: ARM SPE: highlight the need for PPI partitions on heterogeneous systems Andrew Murray
2019-12-20 14:30 ` [PATCH v2 02/18] arm64: KVM: reset E2PB correctly in MDCR_EL2 when exiting the guest(VHE) Andrew Murray
2019-12-21 13:12   ` Marc Zyngier
2019-12-24 10:29     ` Andrew Murray
2020-01-02 16:21       ` Andrew Murray
2019-12-20 14:30 ` [PATCH v2 03/18] arm64: KVM: define SPE data structure for each vcpu Andrew Murray
2019-12-21 13:19   ` Marc Zyngier
2019-12-24 12:01     ` Andrew Murray
2019-12-20 14:30 ` [PATCH v2 04/18] arm64: KVM: add SPE system registers to sys_reg_descs Andrew Murray
2019-12-20 14:30 ` [PATCH v2 05/18] arm64: KVM/VHE: enable the use PMSCR_EL12 on VHE systems Andrew Murray
2019-12-20 14:30 ` [PATCH v2 06/18] arm64: KVM: split debug save restore across vm/traps activation Andrew Murray
2019-12-20 14:30 ` [PATCH v2 07/18] arm64: KVM/debug: drop pmscr_el1 and use sys_regs[PMSCR_EL1] in kvm_cpu_context Andrew Murray
2019-12-20 14:30 ` [PATCH v2 08/18] arm64: KVM: add support to save/restore SPE profiling buffer controls Andrew Murray
2019-12-21 13:57   ` Marc Zyngier
2019-12-24 10:49     ` Andrew Murray
2019-12-24 15:17       ` Andrew Murray
2019-12-24 15:48         ` Marc Zyngier
2019-12-20 14:30 ` [PATCH v2 09/18] arm64: KVM: enable conditional save/restore full " Andrew Murray
2019-12-20 18:06   ` Mark Rutland
2019-12-24 12:15     ` Andrew Murray
2019-12-21 14:13   ` Marc Zyngier
2020-01-07 15:13     ` Andrew Murray
2020-01-08 11:17       ` Marc Zyngier
2020-01-08 11:58         ` Will Deacon
2020-01-08 12:36           ` Marc Zyngier
2020-01-08 13:10             ` Will Deacon
2020-01-09 11:23               ` Andrew Murray
2020-01-09 11:25                 ` Andrew Murray
2020-01-09 12:01                   ` Will Deacon
2020-01-10 10:54     ` Andrew Murray
2020-01-10 11:04       ` Andrew Murray
2020-01-10 11:51         ` Marc Zyngier
2020-01-10 12:12           ` Andrew Murray
2020-01-10 11:18       ` Marc Zyngier
2020-01-10 12:12         ` Andrew Murray
2020-01-10 13:34           ` Marc Zyngier
2019-12-20 14:30 ` [PATCH v2 10/18] arm64: KVM/debug: use EL1&0 stage 1 translation regime Andrew Murray
2019-12-22 10:34   ` Marc Zyngier
2019-12-24 11:11     ` Andrew Murray
2020-01-13 16:31     ` Andrew Murray
2020-01-15 14:03       ` Marc Zyngier
2019-12-20 14:30 ` [PATCH v2 11/18] KVM: arm64: don't trap Statistical Profiling controls to EL2 Andrew Murray
2019-12-20 18:08   ` Mark Rutland
2019-12-22 10:42   ` Marc Zyngier
2019-12-23 11:56     ` Andrew Murray
2019-12-23 12:05       ` Marc Zyngier
2019-12-23 12:10         ` Andrew Murray
2020-01-09 17:25           ` Andrew Murray
2020-01-09 17:42             ` Mark Rutland
2020-01-09 17:46               ` Andrew Murray
2019-12-20 14:30 ` [PATCH v2 12/18] KVM: arm64: add a new vcpu device control group for SPEv1 Andrew Murray
2019-12-22 11:03   ` Marc Zyngier
2019-12-24 12:30     ` Andrew Murray
2019-12-20 14:30 ` Andrew Murray [this message]
2019-12-22 11:24   ` [PATCH v2 13/18] perf: arm_spe: Add KVM structure for obtaining IRQ info Marc Zyngier
2019-12-24 12:35     ` Andrew Murray
2019-12-20 14:30 ` [PATCH v2 14/18] KVM: arm64: spe: Provide guest virtual interrupts for SPE Andrew Murray
2019-12-22 12:07   ` Marc Zyngier
2019-12-24 11:50     ` Andrew Murray
2019-12-24 12:42       ` Marc Zyngier
2019-12-24 13:08         ` Andrew Murray
2019-12-24 13:22           ` Marc Zyngier
2019-12-24 13:36             ` Andrew Murray
2019-12-24 13:46               ` Marc Zyngier
2019-12-20 14:30 ` [PATCH v2 15/18] perf: arm_spe: Handle guest/host exclusion flags Andrew Murray
2019-12-20 18:10   ` Mark Rutland
2019-12-22 12:10   ` Marc Zyngier
2019-12-23 12:10     ` Andrew Murray
2019-12-23 12:18       ` Marc Zyngier
2019-12-20 14:30 ` [PATCH v2 16/18] KVM: arm64: enable SPE support Andrew Murray
2019-12-20 14:30 ` [PATCH v2 17/18, KVMTOOL] update_headers: Sync kvm UAPI headers with linux v5.5-rc2 Andrew Murray
2019-12-20 14:30 ` [PATCH v2 18/18, KVMTOOL] kvm: add a vcpu feature for SPEv1 support Andrew Murray
2019-12-20 17:55 ` [PATCH v2 00/18] arm64: KVM: add SPE profiling support Mark Rutland
2019-12-24 12:54   ` Andrew Murray
2019-12-21 10:48 ` Marc Zyngier
2019-12-22 12:22   ` Marc Zyngier
2019-12-24 12:56     ` Andrew Murray

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