Date: Tue, 10 Mar 2020 11:16:40 -0700 From: John Baldwin <jhb@FreeBSD.org> To: Michael Reifenberger <mr@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r358848 - in head/sys/amd64/vmm: intel io Message-ID: <961b3c75-49d9-824f-b3c4-a7df1f6472a4@FreeBSD.org> In-Reply-To: <202003101653.02AGroUB005254@repo.freebsd.org> References: <202003101653.02AGroUB005254@repo.freebsd.org>
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On 3/10/20 9:53 AM, Michael Reifenberger wrote: > Author: mr > Date: Tue Mar 10 16:53:49 2020 > New Revision: 358848 > URL: https://svnweb.freebsd.org/changeset/base/358848 > > Log: > Untangle TPR shadowing and APIC virtualization. > This speeds up Windows guests tremendously. > > The patch does: > Add a new tuneable 'hw.vmm.vmx.use_tpr_shadowing' to disable TLP shadowing. > Also add 'hw.vmm.vmx.cap.tpr_shadowing' to be able to query if TPR shadowing is used. > > Detach the initialization of TPR shadowing from the initialization of APIC virtualization. > APIC virtualization still needs TPR shadowing, but not vice versa. > Any CPU that supports APIC virtualization should also support TPR shadowing. > > When TPR shadowing is used, the APIC page of each vCPU is written to the VMCS_VIRTUAL_APIC field of the VMCS > so that the CPU can write directly to the page without intercept. > > On vm exit, vlapic_update_ppr() is called to update the PPR. > > Submitted by: Yamagi Burmeister > MFC after: 2 weeks > Differential Revision: https://reviews.freebsd.org/D22942 Reviewed by: grehan Also, it is still good form to wrap the commit logs to fit in 80 cols. -- John Baldwin
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