From: Roman Kagan <rkagan@virtuozzo.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: kvm@vger.kernel.org, "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
"Haiyang Zhang" <haiyangz@microsoft.com>,
"Stephen Hemminger" <sthemmin@microsoft.com>,
"Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
"Mohammed Gamal" <mmorsy@redhat.com>,
"Cathy Avery" <cavery@redhat.com>,
"Wanpeng Li" <wanpeng.li@hotmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 1/5] KVM: x86: hyperv: enforce vp_index < KVM_MAX_VCPUS
Date: Mon, 9 Jul 2018 20:56:21 +0300 [thread overview]
Message-ID: <20180709175620.GA3017@rkaganb.sw.ru> (raw)
In-Reply-To: <20180703134206.27240-2-vkuznets@redhat.com>
On Tue, Jul 03, 2018 at 03:42:02PM +0200, Vitaly Kuznetsov wrote:
> Hyper-V TLFS (5.0b) states:
>
> > Virtual processors are identified by using an index (VP index). The
> > maximum number of virtual processors per partition supported by the
> > current implementation of the hypervisor can be obtained through CPUID
> > leaf 0x40000005. A virtual processor index must be less than the
> > maximum number of virtual processors per partition.
>
> Forbid userspace to set VP_INDEX above KVM_MAX_VCPUS. get_vcpu_by_vpidx()
> can now be optimized to bail early when supplied vpidx is >= KVM_MAX_VCPUS.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
> arch/x86/kvm/hyperv.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
next prev parent reply other threads:[~2018-07-09 17:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-03 13:42 [PATCH v4 0/5] KVM: x86: hyperv: PV IPI support for Windows guests Vitaly Kuznetsov
2018-07-03 13:42 ` [PATCH v4 1/5] KVM: x86: hyperv: enforce vp_index < KVM_MAX_VCPUS Vitaly Kuznetsov
2018-07-09 17:56 ` Roman Kagan [this message]
2018-07-03 13:42 ` [PATCH v4 2/5] KVM: x86: hyperv: optimize 'all cpus' case in kvm_hv_flush_tlb() Vitaly Kuznetsov
2018-07-09 18:19 ` Roman Kagan
2018-07-03 13:42 ` [PATCH v4 3/5] KVM: x86: hyperv: use get_vcpu_by_vpidx() " Vitaly Kuznetsov
2018-07-09 18:30 ` Roman Kagan
2018-07-03 13:42 ` [PATCH v4 4/5] x86/hyper-v: rename ipi_arg_{ex,non_ex} structures Vitaly Kuznetsov
2018-07-09 18:32 ` Roman Kagan
2018-07-03 13:42 ` [PATCH v4 5/5] KVM: x86: hyperv: implement PV IPI send hypercalls Vitaly Kuznetsov
2018-07-23 11:31 ` [PATCH v4 0/5] KVM: x86: hyperv: PV IPI support for Windows guests Vitaly Kuznetsov
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