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([2001:b07:6468:f312:91d0:a5f0:9f34:4d80]) by smtp.gmail.com with ESMTPSA id z25sm13193792wmk.28.2020.06.25.12.17.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 25 Jun 2020 12:17:43 -0700 (PDT) Subject: Re: qemu polling KVM_IRQ_LINE_STATUS when stopped To: Kevin Locke , kvm@vger.kernel.org, Andi Kleen , Christian Ehrhardt References: <20171018174946.GU5109@tassilo.jf.intel.com> <3d37ef15-932a-1492-3068-9ef0b8cd5794@redhat.com> <20171020003449.GG5109@tassilo.jf.intel.com> <22d62b58-725b-9065-1f6d-081972ca32c3@redhat.com> <20171020140917.GH5109@tassilo.jf.intel.com> <2db78631-3c63-5e93-0ce8-f52b313593e1@redhat.com> <20171020205026.GI5109@tassilo.jf.intel.com> <1560363269.13828538.1508539882580.JavaMail.zimbra@redhat.com> <20200625142651.GA154525@kevinolos> <1fbd0871-7a72-3e12-43af-d3c11c784d83@redhat.com> <20200625185651.GA177472@kevinolos> From: Paolo Bonzini Message-ID: <80754688-d05f-11a3-b25e-955b5ee0ca0b@redhat.com> Date: Thu, 25 Jun 2020 21:17:41 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <20200625185651.GA177472@kevinolos> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 25/06/20 20:56, Kevin Locke wrote: >> Windows 10 can use the Hyper-V synthetic timer instead of the RTC, which >> shouldn't have the problem. > > That's great news! Since I'm able to reproduce the issue on a > recently installed Windows 10 2004 VM on Linux 5.7 with QEMU 5.0, is > there anything I can do to help isolate the bug, or is it a known > issue? You need to enable Hyper-V enlightenments, with something like -cpu host,hv_vpindex,hv_runtime,hv_synic,hv_stimer,hv_reset,hv_time,hv_relaxed on the QEMU command line. Thanks, Paolo