From: Christoffer Dall <christoffer.dall@linaro.org>
To: Julien Grall <julien.grall@arm.com>
Cc: Andrew Jones <drjones@redhat.com>,
kvm@vger.kernel.org, Marc Zyngier <marc.zyngier@arm.com>,
Tomasz Nowicki <tn@semihalf.com>,
Dave Martin <Dave.Martin@arm.com>,
Yury Norov <ynorov@caviumnetworks.com>,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu,
Shih-Wei Li <shihwei@cs.columbia.edu>
Subject: Re: [PATCH v4 31/40] KVM: arm64: Move common VHE/non-VHE trap config in separate functions
Date: Sun, 25 Feb 2018 22:29:43 +0100 [thread overview]
Message-ID: <20180225212943.GH7396@cbox> (raw)
In-Reply-To: <833c8ef7-dfd8-6b01-cab5-c97c86b705f3@arm.com>
On Fri, Feb 23, 2018 at 02:30:54PM +0000, Julien Grall wrote:
> Hi Christoffer,
>
> On 15/02/18 21:03, Christoffer Dall wrote:
> >@@ -85,37 +123,14 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu)
> > {
> > u64 hcr = vcpu->arch.hcr_el2;
> >- /*
> >- * We are about to set CPTR_EL2.TFP to trap all floating point
> >- * register accesses to EL2, however, the ARM ARM clearly states that
> >- * traps are only taken to EL2 if the operation would not otherwise
> >- * trap to EL1. Therefore, always make sure that for 32-bit guests,
> >- * we set FPEXC.EN to prevent traps to EL1, when setting the TFP bit.
> >- * If FP/ASIMD is not implemented, FPEXC is UNDEFINED and any access to
> >- * it will cause an exception.
> >- */
> >- if (vcpu_el1_is_32bit(vcpu) && system_supports_fpsimd()) {
> >- write_sysreg(1 << 30, fpexc32_el2);
> >- isb();
> >- }
> >+ write_sysreg(hcr, hcr_el2);
> > if (cpus_have_const_cap(ARM64_HAS_RAS_EXTN) && (hcr & HCR_VSE))
> > write_sysreg_s(vcpu->arch.vsesr_el2, SYS_VSESR_EL2);
> >- write_sysreg(hcr, hcr_el2);
>
> OOI, any reason to move the write to HCR_EL2 just before the if?
>
Just to keep the two lines together where we read the value from the
vcpu structure and write it to hardware. It's hard to tell from this
patch, but I think it looks nicer in the end.
Thanks,
-Christoffer
WARNING: multiple messages have this Message-ID (diff)
From: christoffer.dall@linaro.org (Christoffer Dall)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 31/40] KVM: arm64: Move common VHE/non-VHE trap config in separate functions
Date: Sun, 25 Feb 2018 22:29:43 +0100 [thread overview]
Message-ID: <20180225212943.GH7396@cbox> (raw)
In-Reply-To: <833c8ef7-dfd8-6b01-cab5-c97c86b705f3@arm.com>
On Fri, Feb 23, 2018 at 02:30:54PM +0000, Julien Grall wrote:
> Hi Christoffer,
>
> On 15/02/18 21:03, Christoffer Dall wrote:
> >@@ -85,37 +123,14 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu)
> > {
> > u64 hcr = vcpu->arch.hcr_el2;
> >- /*
> >- * We are about to set CPTR_EL2.TFP to trap all floating point
> >- * register accesses to EL2, however, the ARM ARM clearly states that
> >- * traps are only taken to EL2 if the operation would not otherwise
> >- * trap to EL1. Therefore, always make sure that for 32-bit guests,
> >- * we set FPEXC.EN to prevent traps to EL1, when setting the TFP bit.
> >- * If FP/ASIMD is not implemented, FPEXC is UNDEFINED and any access to
> >- * it will cause an exception.
> >- */
> >- if (vcpu_el1_is_32bit(vcpu) && system_supports_fpsimd()) {
> >- write_sysreg(1 << 30, fpexc32_el2);
> >- isb();
> >- }
> >+ write_sysreg(hcr, hcr_el2);
> > if (cpus_have_const_cap(ARM64_HAS_RAS_EXTN) && (hcr & HCR_VSE))
> > write_sysreg_s(vcpu->arch.vsesr_el2, SYS_VSESR_EL2);
> >- write_sysreg(hcr, hcr_el2);
>
> OOI, any reason to move the write to HCR_EL2 just before the if?
>
Just to keep the two lines together where we read the value from the
vcpu structure and write it to hardware. It's hard to tell from this
patch, but I think it looks nicer in the end.
Thanks,
-Christoffer
next prev parent reply other threads:[~2018-02-25 21:29 UTC|newest]
Thread overview: 276+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-15 21:02 [PATCH v4 00/40] Optimize KVM/ARM for VHE systems Christoffer Dall
2018-02-15 21:02 ` Christoffer Dall
2018-02-15 21:02 ` [PATCH v4 01/40] KVM: arm/arm64: Avoid vcpu_load for other vcpu ioctls than KVM_RUN Christoffer Dall
2018-02-15 21:02 ` Christoffer Dall
2018-02-21 9:32 ` Marc Zyngier
2018-02-21 9:32 ` Marc Zyngier
2018-02-21 17:05 ` Andrew Jones
2018-02-21 17:05 ` Andrew Jones
2018-02-15 21:02 ` [PATCH v4 02/40] KVM: arm/arm64: Move vcpu_load call after kvm_vcpu_first_run_init Christoffer Dall
2018-02-15 21:02 ` Christoffer Dall
2018-02-21 11:05 ` Marc Zyngier
2018-02-21 11:05 ` Marc Zyngier
2018-02-15 21:02 ` [PATCH v4 03/40] KVM: arm64: Avoid storing the vcpu pointer on the stack Christoffer Dall
2018-02-15 21:02 ` Christoffer Dall
2018-02-19 15:50 ` Julien Grall
2018-02-19 15:50 ` Julien Grall
2018-02-22 8:43 ` Christoffer Dall
2018-02-22 8:43 ` Christoffer Dall
2018-02-21 11:34 ` Marc Zyngier
2018-02-21 11:34 ` Marc Zyngier
2018-02-22 9:02 ` Christoffer Dall
2018-02-22 9:02 ` Christoffer Dall
2018-02-22 9:35 ` Marc Zyngier
2018-02-22 9:35 ` Marc Zyngier
2018-02-22 9:49 ` Andrew Jones
2018-02-22 9:49 ` Andrew Jones
2018-02-21 17:32 ` Andrew Jones
2018-02-21 17:32 ` Andrew Jones
2018-02-22 9:10 ` Christoffer Dall
2018-02-22 9:10 ` Christoffer Dall
2018-02-22 9:56 ` Andrew Jones
2018-02-22 9:56 ` Andrew Jones
2018-02-22 10:24 ` Christoffer Dall
2018-02-22 10:24 ` Christoffer Dall
2018-02-15 21:02 ` [PATCH v4 04/40] KVM: arm64: Rework hyp_panic for VHE and non-VHE Christoffer Dall
2018-02-15 21:02 ` Christoffer Dall
2018-02-21 17:32 ` Andrew Jones
2018-02-21 17:32 ` Andrew Jones
2018-02-15 21:02 ` [PATCH v4 05/40] KVM: arm64: Move HCR_INT_OVERRIDE to default HCR_EL2 guest flag Christoffer Dall
2018-02-15 21:02 ` Christoffer Dall
2018-02-15 21:02 ` [PATCH v4 06/40] KVM: arm/arm64: Get rid of vcpu->arch.irq_lines Christoffer Dall
2018-02-15 21:02 ` Christoffer Dall
2018-02-15 21:02 ` [PATCH v4 07/40] KVM: arm/arm64: Add kvm_vcpu_load_sysregs and kvm_vcpu_put_sysregs Christoffer Dall
2018-02-15 21:02 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 08/40] KVM: arm/arm64: Introduce vcpu_el1_is_32bit Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 12:05 ` Marc Zyngier
2018-02-21 12:05 ` Marc Zyngier
2018-02-22 9:11 ` Christoffer Dall
2018-02-22 9:11 ` Christoffer Dall
2018-02-21 17:34 ` Andrew Jones
2018-02-21 17:34 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 09/40] KVM: arm64: Move debug dirty flag calculation out of world switch Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 17:35 ` Andrew Jones
2018-02-21 17:35 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 10/40] KVM: arm64: Slightly improve debug save/restore functions Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 17:39 ` Andrew Jones
2018-02-21 17:39 ` Andrew Jones
2018-02-21 17:52 ` Marc Zyngier
2018-02-21 17:52 ` Marc Zyngier
2018-02-22 8:05 ` Andrew Jones
2018-02-22 8:05 ` Andrew Jones
2018-02-24 18:32 ` Christoffer Dall
2018-02-24 18:32 ` Christoffer Dall
2018-02-24 20:16 ` Marc Zyngier
2018-02-24 20:16 ` Marc Zyngier
2018-02-15 21:03 ` [PATCH v4 11/40] KVM: arm64: Improve debug register save/restore flow Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 17:40 ` Andrew Jones
2018-02-21 17:40 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 12/40] KVM: arm64: Factor out fault info population and gic workarounds Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 17:41 ` Andrew Jones
2018-02-21 17:41 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 13/40] KVM: arm64: Introduce VHE-specific kvm_vcpu_run Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 17:43 ` Andrew Jones
2018-02-21 17:43 ` Andrew Jones
2018-02-21 18:18 ` Andrew Jones
2018-02-21 18:18 ` Andrew Jones
2018-02-22 9:16 ` Christoffer Dall
2018-02-22 9:16 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 14/40] KVM: arm64: Remove kern_hyp_va() use in VHE switch function Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 15/40] KVM: arm64: Don't deactivate VM on VHE systems Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 16/40] KVM: arm64: Remove noop calls to timer save/restore from VHE switch Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 17:43 ` Andrew Jones
2018-02-21 17:43 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 17/40] KVM: arm64: Move userspace system registers into separate function Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-19 17:21 ` Julien Grall
2018-02-19 17:21 ` Julien Grall
2018-02-22 9:18 ` Christoffer Dall
2018-02-22 9:18 ` Christoffer Dall
2018-02-21 12:21 ` Marc Zyngier
2018-02-21 12:21 ` Marc Zyngier
2018-02-15 21:03 ` [PATCH v4 18/40] KVM: arm64: Rewrite sysreg alternatives to static keys Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 17:44 ` Andrew Jones
2018-02-21 17:44 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 19/40] KVM: arm64: Introduce separate VHE/non-VHE sysreg save/restore functions Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 20/40] KVM: arm/arm64: Remove leftover comment from kvm_vcpu_run_vhe Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 17:47 ` Andrew Jones
2018-02-21 17:47 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 21/40] KVM: arm64: Unify non-VHE host/guest sysreg save and restore functions Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 22/40] KVM: arm64: Don't save the host ELR_EL2 and SPSR_EL2 on VHE systems Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 17:49 ` Andrew Jones
2018-02-21 17:49 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 23/40] KVM: arm64: Change 32-bit handling of VM system registers Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 24/40] KVM: arm64: Rewrite system register accessors to read/write functions Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-19 18:12 ` Julien Grall
2018-02-19 18:12 ` Julien Grall
2018-02-22 9:18 ` Christoffer Dall
2018-02-22 9:18 ` Christoffer Dall
2018-02-21 13:32 ` Marc Zyngier
2018-02-21 13:32 ` Marc Zyngier
2018-02-22 9:22 ` Christoffer Dall
2018-02-22 9:22 ` Christoffer Dall
2018-02-22 10:48 ` Marc Zyngier
2018-02-22 10:48 ` Marc Zyngier
2018-02-22 11:10 ` Christoffer Dall
2018-02-22 11:10 ` Christoffer Dall
2018-02-22 13:26 ` Marc Zyngier
2018-02-22 13:26 ` Marc Zyngier
2018-02-22 13:34 ` Andrew Jones
2018-02-22 13:34 ` Andrew Jones
2018-02-22 14:35 ` Christoffer Dall
2018-02-22 14:35 ` Christoffer Dall
2018-02-22 15:11 ` Andrew Jones
2018-02-22 15:11 ` Andrew Jones
2018-02-22 15:58 ` Christoffer Dall
2018-02-22 15:58 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 25/40] KVM: arm64: Introduce framework for accessing deferred sysregs Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 14:16 ` Marc Zyngier
2018-02-21 14:16 ` Marc Zyngier
2018-02-22 13:40 ` Andrew Jones
2018-02-22 13:40 ` Andrew Jones
2018-02-22 14:56 ` Christoffer Dall
2018-02-22 14:56 ` Christoffer Dall
2018-02-22 17:40 ` Julien Grall
2018-02-22 17:40 ` Julien Grall
2018-02-15 21:03 ` [PATCH v4 26/40] KVM: arm/arm64: Prepare to handle deferred save/restore of SPSR_EL1 Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 14:47 ` Marc Zyngier
2018-02-21 14:47 ` Marc Zyngier
2018-02-22 9:25 ` Christoffer Dall
2018-02-22 9:25 ` Christoffer Dall
2018-02-22 13:49 ` Andrew Jones
2018-02-22 13:49 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 27/40] KVM: arm64: Prepare to handle deferred save/restore of ELR_EL1 Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 15:08 ` Marc Zyngier
2018-02-21 15:08 ` Marc Zyngier
2018-02-22 13:51 ` Andrew Jones
2018-02-22 13:51 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 28/40] KVM: arm64: Defer saving/restoring 64-bit sysregs to vcpu load/put on VHE Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 15:33 ` Marc Zyngier
2018-02-21 15:33 ` Marc Zyngier
2018-02-23 18:05 ` Christoffer Dall
2018-02-23 18:05 ` Christoffer Dall
2018-02-22 14:04 ` Andrew Jones
2018-02-22 14:04 ` Andrew Jones
2018-02-22 18:30 ` Julien Grall
2018-02-22 18:30 ` Julien Grall
2018-02-22 18:31 ` Julien Grall
2018-02-22 18:31 ` Julien Grall
2018-02-22 19:49 ` Christoffer Dall
2018-02-22 19:49 ` Christoffer Dall
2018-02-22 19:48 ` Christoffer Dall
2018-02-22 19:48 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 29/40] KVM: arm64: Prepare to handle deferred save/restore of 32-bit registers Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 15:44 ` Marc Zyngier
2018-02-21 15:44 ` Marc Zyngier
2018-02-22 14:30 ` Andrew Jones
2018-02-22 14:30 ` Andrew Jones
2018-02-23 11:35 ` Julien Grall
2018-02-23 11:35 ` Julien Grall
2018-02-15 21:03 ` [PATCH v4 30/40] KVM: arm64: Defer saving/restoring 32-bit sysregs to vcpu load/put Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 16:27 ` Marc Zyngier
2018-02-21 16:27 ` Marc Zyngier
2018-02-22 18:15 ` Christoffer Dall
2018-02-22 18:15 ` Christoffer Dall
2018-02-22 14:35 ` Andrew Jones
2018-02-22 14:35 ` Andrew Jones
2018-02-22 14:58 ` Christoffer Dall
2018-02-22 14:58 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 31/40] KVM: arm64: Move common VHE/non-VHE trap config in separate functions Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 17:59 ` Marc Zyngier
2018-02-21 17:59 ` Marc Zyngier
2018-02-22 18:17 ` Christoffer Dall
2018-02-22 18:17 ` Christoffer Dall
2018-02-25 21:27 ` Christoffer Dall
2018-02-25 21:27 ` Christoffer Dall
2018-02-22 15:34 ` Andrew Jones
2018-02-22 15:34 ` Andrew Jones
2018-02-23 14:30 ` Julien Grall
2018-02-23 14:30 ` Julien Grall
2018-02-23 17:48 ` Christoffer Dall
2018-02-23 17:48 ` Christoffer Dall
2018-02-25 21:29 ` Christoffer Dall [this message]
2018-02-25 21:29 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 32/40] KVM: arm64: Directly call VHE and non-VHE FPSIMD enabled functions Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 18:11 ` Marc Zyngier
2018-02-21 18:11 ` Marc Zyngier
2018-02-22 15:38 ` Andrew Jones
2018-02-22 15:38 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 33/40] KVM: arm64: Configure c15, PMU, and debug register traps on cpu load/put for VHE Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 18:20 ` Marc Zyngier
2018-02-21 18:20 ` Marc Zyngier
2018-02-22 18:57 ` Christoffer Dall
2018-02-22 18:57 ` Christoffer Dall
2018-02-22 15:51 ` Andrew Jones
2018-02-22 15:51 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 34/40] KVM: arm64: Cleanup __activate_traps and __deactive_traps for VHE and non-VHE Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-21 18:26 ` Marc Zyngier
2018-02-21 18:26 ` Marc Zyngier
2018-02-22 19:04 ` Christoffer Dall
2018-02-22 19:04 ` Christoffer Dall
2018-02-22 15:54 ` Andrew Jones
2018-02-22 15:54 ` Andrew Jones
2018-02-15 21:03 ` [PATCH v4 35/40] KVM: arm/arm64: Get rid of vgic_elrsr Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-22 9:45 ` Marc Zyngier
2018-02-22 9:45 ` Marc Zyngier
2018-02-23 14:44 ` Julien Grall
2018-02-23 14:44 ` Julien Grall
2018-02-23 17:50 ` Christoffer Dall
2018-02-23 17:50 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 36/40] KVM: arm/arm64: Handle VGICv2 save/restore from the main VGIC code Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 37/40] KVM: arm/arm64: Move arm64-only vgic-v2-sr.c file to arm64 Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-22 12:33 ` Marc Zyngier
2018-02-22 12:33 ` Marc Zyngier
2018-02-22 14:37 ` Christoffer Dall
2018-02-22 14:37 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 38/40] KVM: arm/arm64: Handle VGICv3 save/restore from the main VGIC code on VHE Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-22 12:32 ` Marc Zyngier
2018-02-22 12:32 ` Marc Zyngier
2018-02-22 14:42 ` Christoffer Dall
2018-02-22 14:42 ` Christoffer Dall
2018-02-22 15:01 ` Marc Zyngier
2018-02-22 15:01 ` Marc Zyngier
2018-02-22 16:02 ` Christoffer Dall
2018-02-22 16:02 ` Christoffer Dall
2018-02-22 17:21 ` Marc Zyngier
2018-02-22 17:21 ` Marc Zyngier
2018-02-22 19:28 ` Christoffer Dall
2018-02-22 19:28 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 39/40] KVM: arm/arm64: Move VGIC APR save/restore to vgic put/load Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
2018-02-22 13:11 ` Marc Zyngier
2018-02-22 13:11 ` Marc Zyngier
2018-02-22 14:44 ` Christoffer Dall
2018-02-22 14:44 ` Christoffer Dall
2018-02-15 21:03 ` [PATCH v4 40/40] KVM: arm/arm64: Avoid VGICv3 save/restore on VHE with no IRQs Christoffer Dall
2018-02-15 21:03 ` Christoffer Dall
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