From: Christoffer Dall <cdall@linaro.org>
To: Marc Zyngier <marc.zyngier@arm.com>
Cc: Christoffer Dall <christoffer.dall@linaro.org>,
David Daney <david.daney@cavium.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Robert Richter <rrichter@cavium.com>,
Eric Auger <eric.auger@redhat.com>,
Alexander Graf <agraf@suse.de>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org
Subject: Re: [PATCH v3 24/27] KVM: arm64: Enable GICv3 common sysreg trapping via command-line
Date: Fri, 9 Jun 2017 17:31:24 +0200 [thread overview]
Message-ID: <20170609153124.GG11099@cbox> (raw)
In-Reply-To: <20170609114956.25963-25-marc.zyngier@arm.com>
On Fri, Jun 09, 2017 at 12:49:53PM +0100, Marc Zyngier wrote:
> Now that we're able to safely handle common sysreg access, let's
> give the user the opportunity to enable it by passing a specific
> command-line option (vgic_v3.common_trap).
>
> Tested-by: Alexander Graf <agraf@suse.de>
> Acked-by: David Daney <david.daney@cavium.com>
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <cdall@linaro.org>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 4 ++++
> include/linux/irqchip/arm-gic-v3.h | 1 +
> virt/kvm/arm/vgic/vgic-v3.c | 11 ++++++++++-
> 3 files changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 88bdc421351f..aa8341e73b35 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -1837,6 +1837,10 @@
> [KVM,ARM] Trap guest accesses to GICv3 group-1
> system registers
>
> + kvm-arm.vgic_v3_common_trap=
> + [KVM,ARM] Trap guest accesses to GICv3 common
> + system registers
> +
> kvm-intel.ept= [KVM,Intel] Disable extended page tables
> (virtualized MMU) support on capable Intel chips.
> Default is 1 (enabled)
> diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
> index 46a1e0943cf8..f0cebb6e57d0 100644
> --- a/include/linux/irqchip/arm-gic-v3.h
> +++ b/include/linux/irqchip/arm-gic-v3.h
> @@ -417,6 +417,7 @@
>
> #define ICH_HCR_EN (1 << 0)
> #define ICH_HCR_UIE (1 << 1)
> +#define ICH_HCR_TC (1 << 10)
> #define ICH_HCR_TALL0 (1 << 11)
> #define ICH_HCR_TALL1 (1 << 12)
> #define ICH_HCR_EOIcount_SHIFT 27
> diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
> index ffc581b70c4e..3960e89c05ad 100644
> --- a/virt/kvm/arm/vgic/vgic-v3.c
> +++ b/virt/kvm/arm/vgic/vgic-v3.c
> @@ -23,6 +23,7 @@
>
> static bool group0_trap;
> static bool group1_trap;
> +static bool common_trap;
>
> void vgic_v3_set_underflow(struct kvm_vcpu *vcpu)
> {
> @@ -246,6 +247,8 @@ void vgic_v3_enable(struct kvm_vcpu *vcpu)
> vgic_v3->vgic_hcr |= ICH_HCR_TALL0;
> if (group1_trap)
> vgic_v3->vgic_hcr |= ICH_HCR_TALL1;
> + if (common_trap)
> + vgic_v3->vgic_hcr |= ICH_HCR_TC;
> }
>
> int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq)
> @@ -431,6 +434,12 @@ static int __init early_group1_trap_cfg(char *buf)
> }
> early_param("kvm-arm.vgic_v3_group1_trap", early_group1_trap_cfg);
>
> +static int __init early_common_trap_cfg(char *buf)
> +{
> + return strtobool(buf, &common_trap);
> +}
> +early_param("kvm-arm.vgic_v3_common_trap", early_common_trap_cfg);
> +
> /**
> * vgic_v3_probe - probe for a GICv3 compatible interrupt controller in DT
> * @node: pointer to the DT node
> @@ -489,7 +498,7 @@ int vgic_v3_probe(const struct gic_kvm_info *info)
> }
> #endif
>
> - if (group0_trap || group1_trap) {
> + if (group0_trap || group1_trap || common_trap) {
> kvm_info("GICv3 sysreg trapping enabled (reduced performance)\n");
> static_branch_enable(&vgic_v3_cpuif_trap);
> }
> --
> 2.11.0
>
next prev parent reply other threads:[~2017-06-09 15:31 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-09 11:49 [PATCH v3 00/27] arm64: KVM: Mediate access to GICv3 sysregs at EL2 Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 01/27] arm64: Add a facility to turn an ESR syndrome into a sysreg encoding Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 02/27] KVM: arm/arm64: vgic-v3: Add accessors for the ICH_APxRn_EL2 registers Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 03/27] KVM: arm64: Make kvm_condition_valid32() accessible from EL2 Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 04/27] KVM: arm64: vgic-v3: Add hook to handle guest GICv3 sysreg accesses at EL2 Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 05/27] KVM: arm64: vgic-v3: Add ICV_BPR1_EL1 handler Marc Zyngier
2017-06-09 15:23 ` Christoffer Dall
2017-06-09 11:49 ` [PATCH v3 06/27] KVM: arm64: vgic-v3: Add ICV_IGRPEN1_EL1 handler Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 07/27] KVM: arm64: vgic-v3: Add ICV_IAR1_EL1 handler Marc Zyngier
2017-06-09 15:26 ` Christoffer Dall
2017-06-09 11:49 ` [PATCH v3 08/27] KVM: arm64: vgic-v3: Add ICV_EOIR1_EL1 handler Marc Zyngier
2017-06-09 15:27 ` Christoffer Dall
2017-06-09 11:49 ` [PATCH v3 09/27] KVM: arm64: vgic-v3: Add ICV_AP1Rn_EL1 handler Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 10/27] KVM: arm64: vgic-v3: Add ICV_HPPIR1_EL1 handler Marc Zyngier
2017-06-09 15:28 ` Christoffer Dall
2017-06-09 11:49 ` [PATCH v3 11/27] KVM: arm64: vgic-v3: Enable trapping of Group-1 system registers Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 12/27] KVM: arm64: Enable GICv3 Group-1 sysreg trapping via command-line Marc Zyngier
2017-06-09 15:29 ` Christoffer Dall
2017-06-09 11:49 ` [PATCH v3 13/27] KVM: arm64: vgic-v3: Add ICV_BPR0_EL1 handler Marc Zyngier
2017-06-09 15:29 ` Christoffer Dall
2017-06-09 11:49 ` [PATCH v3 14/27] KVM: arm64: vgic-v3: Add ICV_IGNREN0_EL1 handler Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 15/27] KVM: arm64: vgic-v3: Add misc Group-0 handlers Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 16/27] KVM: arm64: vgic-v3: Enable trapping of Group-0 system registers Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 17/27] KVM: arm64: Enable GICv3 Group-0 sysreg trapping via command-line Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 18/27] arm64: Add MIDR values for Cavium cn83XX SoCs Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 19/27] arm64: Add workaround for Cavium Thunder erratum 30115 Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 20/27] KVM: arm64: vgic-v3: Add ICV_DIR_EL1 handler Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 21/27] KVM: arm64: vgic-v3: Add ICV_RPR_EL1 handler Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 22/27] KVM: arm64: vgic-v3: Add ICV_CTLR_EL1 handler Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 23/27] KVM: arm64: vgic-v3: Add ICV_PMR_EL1 handler Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 24/27] KVM: arm64: Enable GICv3 common sysreg trapping via command-line Marc Zyngier
2017-06-09 15:31 ` Christoffer Dall [this message]
2017-06-09 11:49 ` [PATCH v3 25/27] KVM: arm64: vgic-v3: Log which GICv3 system registers are trapped Marc Zyngier
2017-06-09 11:49 ` [PATCH v3 26/27] KVM: arm64: Log an error if trapping a read-from-write-only GICv3 access Marc Zyngier
2017-06-09 15:33 ` Christoffer Dall
2017-06-09 11:49 ` [PATCH v3 27/27] KVM: arm64: Log an error if trapping a write-to-read-only " Marc Zyngier
2017-06-09 15:34 ` Christoffer Dall
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