From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: [PATCH 2/3] KVM: X86: Allow userspace to disable ioport intercept Date: Fri, 11 May 2018 11:42:46 -0400 Message-ID: <20180511154246.GH27459@char.us.oracle.com> References: <1523943962-25415-1-git-send-email-wanpengli@tencent.com> <1523943962-25415-3-git-send-email-wanpengli@tencent.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Paolo Bonzini , Radim =?utf-8?B?S3LEjW3DocWZ?= , Tim Shearer , Liran Alon To: Wanpeng Li Return-path: Content-Disposition: inline In-Reply-To: <1523943962-25415-3-git-send-email-wanpengli@tencent.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On Mon, Apr 16, 2018 at 10:46:01PM -0700, Wanpeng Li wrote: > From: Wanpeng Li >=20 > Allow to disable ioport intercept by userspace. >=20 > Cc: Paolo Bonzini > Cc: Radim Kr=C4=8Dm=C3=A1=C5=99 > Cc: Tim Shearer > Cc: Liran Alon > Signed-off-by: Wanpeng Li > --- > Documentation/virtual/kvm/api.txt | 11 +++++++++++ > arch/x86/include/asm/kvm_host.h | 2 ++ > arch/x86/kvm/x86.c | 5 +++++ > include/uapi/linux/kvm.h | 1 + > 4 files changed, 19 insertions(+) >=20 > diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/= kvm/api.txt > index 1c7958b..3d0488e 100644 > --- a/Documentation/virtual/kvm/api.txt > +++ b/Documentation/virtual/kvm/api.txt > @@ -4378,6 +4378,17 @@ all such vmexits. > =20 > Do not enable KVM_FEATURE_PV_UNHALT if you disable HLT exits. > =20 > +7.14 KVM_CAP_IOPORT_DISABLE_INTERCEPT > + > +Architectures: x86 > +Parameters: args[0] defines whether ioport intercept "defines whether ioport intercept" -> "defines whether to intercept the p= rovided ioport" > + > +When disable intercept (args[0] =3D=3D 1), some ioports which frequent= ly When args[0] =3D=3D 1 is one, that is disable intercept, some ioports.. > +access will not be intercepted. Why not proide args[1] which will have the ioport in questions? Or an arr= ay of them? > + > +When enable intercept (args[0] =3D=3D 0), behavior is as if this facil= ity > +is unsupported. > + > 8. Other capabilities. > ---------------------- > =20 > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm= _host.h > index c25775f..2f29f64 100644 > --- a/arch/x86/include/asm/kvm_host.h > +++ b/arch/x86/include/asm/kvm_host.h > @@ -808,6 +808,8 @@ struct kvm_arch { > bool hlt_in_guest; > bool pause_in_guest; > =20 > + bool ioport_disable_intercept; > + > unsigned long irq_sources_bitmap; > s64 kvmclock_offset; > raw_spinlock_t tsc_write_lock; > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 51ecd38..044e314 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -2881,6 +2881,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm,= long ext) > case KVM_CAP_SPLIT_IRQCHIP: > case KVM_CAP_IMMEDIATE_EXIT: > case KVM_CAP_GET_MSR_FEATURES: > + case KVM_CAP_IOPORT_DISABLE_INTERCEPT: > r =3D 1; > break; > case KVM_CAP_SYNC_REGS: > @@ -4250,6 +4251,10 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *k= vm, > kvm->arch.pause_in_guest =3D true; > r =3D 0; > break; > + case KVM_CAP_IOPORT_DISABLE_INTERCEPT: > + kvm->arch.ioport_disable_intercept =3D cap->args[0]; > + r =3D 0; > + break; > default: > r =3D -EINVAL; > break; > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > index 1065006..92730d8 100644 > --- a/include/uapi/linux/kvm.h > +++ b/include/uapi/linux/kvm.h > @@ -941,6 +941,7 @@ struct kvm_ppc_resize_hpt { > #define KVM_CAP_S390_BPB 152 > #define KVM_CAP_GET_MSR_FEATURES 153 > #define KVM_CAP_HYPERV_EVENTFD 154 > +#define KVM_CAP_IOPORT_DISABLE_INTERCEPT 155 > =20 > #ifdef KVM_CAP_IRQ_ROUTING > =20 > --=20 > 2.7.4 >=20