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Re: [Xen-devel] [PATCH] add support for XCHG instruction accessing APIC
| To: | Boris Ostrovsky <bostrovsky@xxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] add support for XCHG instruction accessing APIC |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Wed, 5 Apr 2006 10:50:54 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Wed, 05 Apr 2006 02:50:40 -0700 |
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On 4 Apr 2006, at 22:24, Boris Ostrovsky wrote: 32-bit SMP Linux uses xchg instruction to access APIC (see apic_write_atomic()). Attached is patch that adds support for this instruction. The patch also fixes missed dependencies (in xen/Rules.mk) on header files in include/asm-x86/hvm. I wonder if it is worth adding the locking? xchg is only used to write to broken APICs -- the OS does not care about the returned value. The APIC is implemented entirely in Xen, so the lock isn't held across an ioreq round-trip to qemu-dm, right? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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