Date: Thu, 21 Aug 2014 03:24:48 +0000 From: Wei Hu <weh@microsoft.com> To: =?iso-8859-1?Q?Roger_Pau_Monn=E9?= <roger.pau@citrix.com>, John Baldwin <jhb@freebsd.org>, "freebsd-drivers@freebsd.org" <freebsd-drivers@freebsd.org> Cc: "freebsd-xen@freebsd.org" <freebsd-xen@freebsd.org>, "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: RE: Directly reserve an interrupt IDT entry for Hyper-V Message-ID: <07ddd62e6cc84509aa76aa299c8dbd3c@BY1PR0301MB0902.namprd03.prod.outlook.com> In-Reply-To: <53F4CDBA.8040500@citrix.com> References: <3defccd56bc0407c88bdda139b2462ac@BY1PR0301MB0902.namprd03.prod.outlook.com> <53F4A34A.4010807@citrix.com> <201408201131.29399.jhb@freebsd.org> <53F4CDBA.8040500@citrix.com>
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Hi Roger and John, I will request a free IDT slot instead of sharing the same vector with Xen. It would be great to have an API to do this. Before the API is available, I will probably use the same way as in vmm_ipi.c to find a free slot. Thanks so much for your help, Wei -----Original Message----- From: Roger Pau Monné [mailto:roger.pau@citrix.com] Sent: Thursday, August 21, 2014 12:33 AM To: John Baldwin; freebsd-drivers@freebsd.org Cc: Wei Hu; freebsd-xen@freebsd.org; freebsd-virtualization@freebsd.org Subject: Re: Directly reserve an interrupt IDT entry for Hyper-V On 20/08/14 17:31, John Baldwin wrote: > On Wednesday, August 20, 2014 9:31:54 am Roger Pau Monné wrote: >> Hello, >> >> I don't think using the same IDT vector is the right approach, I >> would just pick a different IDT vector and use that for Hyper-V. >> Using the same IDT vector (like your suggestion above) would prevent >> shipping a kernel with with both Hyper-V and Xen support (like it's >> done now in GENERIC). >> >> Roger. > > Hmm, can't you make this a runtime check to only call setidt() if you > detect you are under the appropriate hypervisor? > > Also, bhyve currently has a hackish way of requesting a free IDT slot. > Perhaps it would be best if I added little API to reserve an IDT slot > assuming that callers could accept a dynamic IDT vector rather than a static one. That would work for Xen. The IDT vector doesn't need to be fixed since it's registered with Xen when the system boots. Roger.home | help
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