From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mario Smarduch Subject: Re: [PATCH v2 1/2] KVM/arm: add hooks for armv7 fp/simd lazy switch support Date: Mon, 19 Oct 2015 16:16:53 -0700 Message-ID: <562579E5.6040008@samsung.com> References: <1443311009-4811-1-git-send-email-m.smarduch@samsung.com> <1443311009-4811-2-git-send-email-m.smarduch@samsung.com> <20151019085332.GA24104@cbox> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: marc.zyngier@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org To: Christoffer Dall Return-path: In-reply-to: <20151019085332.GA24104@cbox> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu List-Id: kvm.vger.kernel.org On 10/19/2015 1:53 AM, Christoffer Dall wrote: > On Sat, Sep 26, 2015 at 04:43:28PM -0700, Mario Smarduch wrote: >> This patch adds vcpu fields to track lazy state, save host FPEXC, and >> offsets to fields. >> >> Signed-off-by: Mario Smarduch >> --- >> arch/arm/include/asm/kvm_host.h | 6 ++++++ >> arch/arm/kernel/asm-offsets.c | 2 ++ >> 2 files changed, 8 insertions(+) >> >> diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h >> index dcba0fa..194a8ef 100644 >> --- a/arch/arm/include/asm/kvm_host.h >> +++ b/arch/arm/include/asm/kvm_host.h >> @@ -111,6 +111,12 @@ struct kvm_vcpu_arch { >> /* Interrupt related fields */ >> u32 irq_lines; /* IRQ and FIQ levels */ >> >> + /* Track fp/simd lazy switch state */ >> + u32 vfp_lazy; > > so is this a flags field or basically a boolean? If the latter, what is > does it mean when the field is true vs. false? Yes it's a bool will update, and clarify comments. > >> + >> + /* Save host FPEXC register to restore on vcpu put */ >> + u32 saved_fpexc; > > is this only the host's state? If so, why not name it host_fpexc? That's right itis host state, will change. > > Thanks, > -Christoffer > >> + >> /* Exception Information */ >> struct kvm_vcpu_fault_info fault; >> >> diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c >> index 871b826..e1c3a41 100644 >> --- a/arch/arm/kernel/asm-offsets.c >> +++ b/arch/arm/kernel/asm-offsets.c >> @@ -186,6 +186,8 @@ int main(void) >> DEFINE(VCPU_CPSR, offsetof(struct kvm_vcpu, arch.regs.usr_regs.ARM_cpsr)); >> DEFINE(VCPU_HCR, offsetof(struct kvm_vcpu, arch.hcr)); >> DEFINE(VCPU_IRQ_LINES, offsetof(struct kvm_vcpu, arch.irq_lines)); >> + DEFINE(VCPU_VFP_LAZY, offsetof(struct kvm_vcpu, arch.vfp_lazy)); >> + DEFINE(VCPU_VFP_FPEXC, offsetof(struct kvm_vcpu, arch.saved_fpexc)); >> DEFINE(VCPU_HSR, offsetof(struct kvm_vcpu, arch.fault.hsr)); >> DEFINE(VCPU_HxFAR, offsetof(struct kvm_vcpu, arch.fault.hxfar)); >> DEFINE(VCPU_HPFAR, offsetof(struct kvm_vcpu, arch.fault.hpfar)); >> -- >> 1.9.1 >>