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From: Andrew Murray <andrew.murray@arm.com>
To: Marc Zyngier <maz@kernel.org>
Cc: will@kernel.org, Catalin Marinas <catalin.marinas@arm.com>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Sudeep Holla <sudeep.holla@arm.com>,
	kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 03/18] arm64: KVM: define SPE data structure for each vcpu
Date: Tue, 24 Dec 2019 12:01:40 +0000
Message-ID: <20191224120140.GH42593@e119886-lin.cambridge.arm.com> (raw)
In-Reply-To: <20191221131936.21fa2dfa@why>

On Sat, Dec 21, 2019 at 01:19:36PM +0000, Marc Zyngier wrote:
> On Fri, 20 Dec 2019 14:30:10 +0000
> Andrew Murray <andrew.murray@arm.com> wrote:
> 
> > From: Sudeep Holla <sudeep.holla@arm.com>
> > 
> > In order to support virtual SPE for guest, so define some basic structs.
> > This features depends on host having hardware with SPE support.
> > 
> > Since we can support this only on ARM64, add a separate config symbol
> > for the same.
> > 
> > Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> > [ Add irq_level, rename irq to irq_num for kvm_spe ]
> > Signed-off-by: Andrew Murray <andrew.murray@arm.com>
> > ---
> >  arch/arm64/include/asm/kvm_host.h |  2 ++
> >  arch/arm64/kvm/Kconfig            |  7 +++++++
> >  include/kvm/arm_spe.h             | 19 +++++++++++++++++++
> >  3 files changed, 28 insertions(+)
> >  create mode 100644 include/kvm/arm_spe.h
> > 
> > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> > index c61260cf63c5..f5dcff912645 100644
> > --- a/arch/arm64/include/asm/kvm_host.h
> > +++ b/arch/arm64/include/asm/kvm_host.h
> > @@ -35,6 +35,7 @@
> >  #include <kvm/arm_vgic.h>
> >  #include <kvm/arm_arch_timer.h>
> >  #include <kvm/arm_pmu.h>
> > +#include <kvm/arm_spe.h>
> >  
> >  #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
> >  
> > @@ -302,6 +303,7 @@ struct kvm_vcpu_arch {
> >  	struct vgic_cpu vgic_cpu;
> >  	struct arch_timer_cpu timer_cpu;
> >  	struct kvm_pmu pmu;
> > +	struct kvm_spe spe;
> >  
> >  	/*
> >  	 * Anything that is not used directly from assembly code goes
> > diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
> > index a475c68cbfec..af5be2c57dcb 100644
> > --- a/arch/arm64/kvm/Kconfig
> > +++ b/arch/arm64/kvm/Kconfig
> > @@ -35,6 +35,7 @@ config KVM
> >  	select HAVE_KVM_EVENTFD
> >  	select HAVE_KVM_IRQFD
> >  	select KVM_ARM_PMU if HW_PERF_EVENTS
> > +	select KVM_ARM_SPE if (HW_PERF_EVENTS && ARM_SPE_PMU)
> >  	select HAVE_KVM_MSI
> >  	select HAVE_KVM_IRQCHIP
> >  	select HAVE_KVM_IRQ_ROUTING
> > @@ -61,6 +62,12 @@ config KVM_ARM_PMU
> >  	  Adds support for a virtual Performance Monitoring Unit (PMU) in
> >  	  virtual machines.
> >  
> > +config KVM_ARM_SPE
> > +	bool
> > +	---help---
> > +	  Adds support for a virtual Statistical Profiling Extension(SPE) in
> > +	  virtual machines.
> > +
> >  config KVM_INDIRECT_VECTORS
> >         def_bool KVM && (HARDEN_BRANCH_PREDICTOR || HARDEN_EL2_VECTORS)
> >  
> > diff --git a/include/kvm/arm_spe.h b/include/kvm/arm_spe.h
> > new file mode 100644
> > index 000000000000..48d118fdb174
> > --- /dev/null
> > +++ b/include/kvm/arm_spe.h
> > @@ -0,0 +1,19 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2019 ARM Ltd.
> > + */
> > +
> > +#ifndef __ASM_ARM_KVM_SPE_H
> > +#define __ASM_ARM_KVM_SPE_H
> > +
> > +#include <uapi/linux/kvm.h>
> > +#include <linux/kvm_host.h>
> 
> I don't believe these are required at this stage.
> 
> > +
> > +struct kvm_spe {
> > +	int irq_num;
> 
> 'irq' was the right name *if* this represents a Linux irq. If this
> instead represents a guest PPI, then it should be named 'intid'.
> 
> In either case, please document what this represents.
> 
> > +	bool ready; /* indicates that SPE KVM instance is ready for use */
> > +	bool created; /* SPE KVM instance is created, may not be ready yet */
> > +	bool irq_level;
> 
> What does this represent? The state of the interrupt on the host? The
> guest? Something else? Also, please consider grouping related fields
> together.

It should be the state of the interrupt on the guest.

> 
> > +};
> 
> If you've added a config option that controls the selection of the SPE
> feature, why doesn't this result in an empty structure when it isn't
> selected?

OK, all noted.

Andrew Murray

> 
> > +
> > +#endif /* __ASM_ARM_KVM_SPE_H */
> 
> Thanks,
> 
> 	M.
> -- 
> Jazz is not dead. It just smells funny...

  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 [this message]
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 ` [PATCH v2 13/18] perf: arm_spe: Add KVM structure for obtaining IRQ info Andrew Murray
2019-12-22 11:24   ` 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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