From: Marc Zyngier <maz@kernel.org>
To: Andrew Murray <andrew.murray@arm.com>
Cc: kvm@vger.kernel.org, Catalin Marinas <catalin.marinas@arm.com>,
linux-kernel@vger.kernel.org, Sudeep Holla <sudeep.holla@arm.com>,
Will Deacon <will@kernel.org>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 10/18] arm64: KVM/debug: use EL1&0 stage 1 translation regime
Date: Sun, 22 Dec 2019 10:34:55 +0000 [thread overview]
Message-ID: <86d0cgir74.wl-maz@kernel.org> (raw)
In-Reply-To: <20191220143025.33853-11-andrew.murray@arm.com>
On Fri, 20 Dec 2019 14:30:17 +0000,
Andrew Murray <andrew.murray@arm.com> wrote:
>
> From: Sudeep Holla <sudeep.holla@arm.com>
>
> Now that we have all the save/restore mechanism in place, lets enable
> the translation regime used by buffer from EL2 stage 1 to EL1 stage 1
> on VHE systems.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> [ Reword commit, don't trap to EL2 ]
Not trapping to EL2 for the case where we don't allow SPE in the
guest is not acceptable.
> Signed-off-by: Andrew Murray <andrew.murray@arm.com>
> ---
> arch/arm64/kvm/hyp/switch.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
> index 67b7c160f65b..6c153b79829b 100644
> --- a/arch/arm64/kvm/hyp/switch.c
> +++ b/arch/arm64/kvm/hyp/switch.c
> @@ -100,6 +100,7 @@ static void activate_traps_vhe(struct kvm_vcpu *vcpu)
>
> write_sysreg(val, cpacr_el1);
>
> + write_sysreg(vcpu->arch.mdcr_el2 | 3 << MDCR_EL2_E2PB_SHIFT, mdcr_el2);
> write_sysreg(kvm_get_hyp_vector(), vbar_el1);
> }
> NOKPROBE_SYMBOL(activate_traps_vhe);
> @@ -117,6 +118,7 @@ static void __hyp_text __activate_traps_nvhe(struct kvm_vcpu *vcpu)
> __activate_traps_fpsimd32(vcpu);
> }
>
> + write_sysreg(vcpu->arch.mdcr_el2 | 3 << MDCR_EL2_E2PB_SHIFT, mdcr_el2);
There is a _MASK macro that can replace this '3', and is in keeping
with the rest of the code.
It still remains that it looks like the wrong place to do this, and
vcpu_load seems much better. Why should you write to mdcr_el2 on each
entry to the guest, since you know whether it has SPE enabled at the
point where it gets scheduled?
M.
--
Jazz is not dead, it just smells funny.
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next prev parent reply other threads:[~2019-12-22 10:34 UTC|newest]
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 [this message]
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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