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Mon, 29 Jun 2020 16:29:12 +0300 Date: Mon, 29 Jun 2020 16:29:11 +0300 From: Roman Bolshakov To: Paolo Bonzini Subject: Re: [PATCH 4/8] i386: hvf: Implement CPU kick Message-ID: <20200629132911.GN25104@SPB-NB-133.local> References: <20200624225850.16982-1-r.bolshakov@yadro.com> <20200624225850.16982-5-r.bolshakov@yadro.com> <9d63db4e-25a7-9c77-6f05-e5f808b8b33c@redhat.com> <20200625155712.GI25104@SPB-NB-133.local> <6508d40b-0142-1b42-2f48-fcd2da66ea4b@redhat.com> <20200629113107.GL25104@SPB-NB-133.local> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-Originating-IP: [172.17.204.212] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) Received-SPF: pass client-ip=89.207.88.252; envelope-from=r.bolshakov@yadro.com; helo=mta-01.yadro.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/29 07:31:11 X-ACL-Warn: Detected OS = Linux 3.11 and newer X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Claudio Fontana , Richard Henderson , Eduardo Habkost , Cameron Esfahani , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, Jun 29, 2020 at 03:03:20PM +0200, Paolo Bonzini wrote: > On 29/06/20 13:31, Roman Bolshakov wrote: > > I implemented what you proposed using VMX-preemption timer in Pin-based > > controls and regular hv_vcpu_run(). It works fine without noticable > > regressions, I'll send that in v2. > > > > hv_vcpu_run_until() was also evaluated on macOS 10.15.5 but it degrades > > VM performance significantly compared to explicit setting of > > VMX-preepmtion timer value and hv_vcpu_run(). The performance issue was > > observed on Broadwell-based MacBook Air and Ivy Bridge-based MacBook > > Pro. > > > > macOS 11.0 Beta deprecated hv_vcpu_run() and introduced a special > > declaration for hv_vcpu_run_until(), that's not available 10.15 - > > HV_DEADLINE_FOREVER (UINT64_MAX, which is bigger than maximum value of > > VMX-preeemption counter). Perhaps the performance issue is addressed > > there. > > Possibly. I'm worried that the preemption-timer trick will fail to run > there, but we'll see. > Well, I've got new VM-exits (caused by zero preemption timer) on either of my laptops. -Roman