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[Xen-devel] Re: [PATCH] [RFC] More fp instructions for realmode emulatio
| To: | Andi Kleen <andi@xxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: [PATCH] [RFC] More fp instructions for realmode emulation (Enables booting OS/2 as a HVM guest on Intel/VT hardware) |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Mon, 03 Mar 2008 15:00:52 +0000 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Trolle Selander <trolle.selander@xxxxxxxxx> |
| Delivery-date: | Mon, 03 Mar 2008 07:03:10 -0800 |
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| Thread-index: | Ach9P1+TnlOdeOkyEdyK1AAX8io7RQ== |
| Thread-topic: | [PATCH] [RFC] More fp instructions for realmode emulation (Enables booting OS/2 as a HVM guest on Intel/VT hardware) |
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On 3/3/08 14:52, "Andi Kleen" <andi@xxxxxxxxxxxxxx> wrote: >> Intel SDM Volume 1 Section 8.6 (?X87 FPU Exception Synchronization?) is very >> helpful in this regard. It confirms my suspicions, that we will need to wrap >> the FPU inline asms in some fixup glue. The only exceptions to this rule are > > Yes you definitely need to. That was a kernel crash bug on native Linux > some time ago... > > Also you need to do the same for any FXSAVEs/FXRSTORs if you haven't already. FXSAVE/FXRSTOR do not flush pending FPU exceptions, right? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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