Re: XEN devices included in kernel even if not XEN
On Tue, 21 Dec 2021, Brad Spencer wrote: Manuel Bouyer writes: On Tue, Dec 21, 2021 at 07:44:59AM -0800, Paul Goyette wrote: I've noticed that device drivers listed in arch/xen/conf/files.xen (or, at least, most of those devices) seem to be included in kernel even if not using XEN. Shouldn't all those devices be conditional? # sysctl -a | grep driver | tr ',' '\n' | grep 'x[be]*' ... [141 -1 xenevt] [142 142 xbd] [143 -1 xencons] I think this lists all the known major numbers for the $MACHINE, I don't think it means that the driver is actually loaded. ... and a PVHVM guest can use the GENERIC kernel, but will want the Xen devices too. Thanks to all for the info. Manuel is correct - I actually checked the build object directory and there are no *.o files related to the xen devices. ++--+--+ | Paul Goyette | PGP Key fingerprint: | E-mail addresses:| | (Retired) | FA29 0E3B 35AF E8AE 6651 | p...@whooppee.com| | Software Developer | 0786 F758 55DE 53BA 7731 | pgoye...@netbsd.org | | & Network Engineer | | pgoyett...@gmail.com | ++--+--+
Re: XEN devices included in kernel even if not XEN
Manuel Bouyer writes: > On Tue, Dec 21, 2021 at 07:44:59AM -0800, Paul Goyette wrote: >> I've noticed that device drivers listed in arch/xen/conf/files.xen >> (or, at least, most of those devices) seem to be included in kernel >> even if not using XEN. Shouldn't all those devices be conditional? >> >> # sysctl -a | grep driver | tr ',' '\n' | grep 'x[be]*' >> ... >> [141 -1 xenevt] >> [142 142 xbd] >> [143 -1 xencons] > > I think this lists all the known major numbers for the $MACHINE, I don't think > it means that the driver is actually loaded. ... and a PVHVM guest can use the GENERIC kernel, but will want the Xen devices too. -- Brad Spencer - b...@anduin.eldar.org - KC8VKS - http://anduin.eldar.org
Re: XEN devices included in kernel even if not XEN
On Tue, Dec 21, 2021 at 07:44:59AM -0800, Paul Goyette wrote: > I've noticed that device drivers listed in arch/xen/conf/files.xen > (or, at least, most of those devices) seem to be included in kernel > even if not using XEN. Shouldn't all those devices be conditional? > > # sysctl -a | grep driver | tr ',' '\n' | grep 'x[be]*' > ... > [141 -1 xenevt] > [142 142 xbd] > [143 -1 xencons] I think this lists all the known major numbers for the $MACHINE, I don't think it means that the driver is actually loaded. -- Manuel Bouyer NetBSD: 26 ans d'experience feront toujours la difference --
XEN devices included in kernel even if not XEN
I've noticed that device drivers listed in arch/xen/conf/files.xen
(or, at least, most of those devices) seem to be included in kernel
even if not using XEN. Shouldn't all those devices be conditional?
# sysctl -a | grep driver | tr ',' '\n' | grep 'x[be]*'
...
[141 -1 xenevt]
[142 142 xbd]
[143 -1 xencons]
# tail $OBJDIR/amd64/sys/arch/amd64/compile/SPEEDY/opt_xen.h
#endif
/* option `XEN' not defined */ <<
#ifdef _LOCORE
.ifndef _KERNEL_OPT_XEN
.global _KERNEL_OPT_XEN
.equiv _KERNEL_OPT_XEN,0x6e074def
.endif
#else
__asm(" .ifndef _KERNEL_OPT_XEN\n .global _KERNEL_OPT_XEN\n .equiv
_KERNEL_OPT_XEN,0x6e074def\n .endif");
#endif
++--+--+
| Paul Goyette | PGP Key fingerprint: | E-mail addresses:|
| (Retired) | FA29 0E3B 35AF E8AE 6651 | p...@whooppee.com|
| Software Developer | 0786 F758 55DE 53BA 7731 | pgoye...@netbsd.org |
| & Network Engineer | | pgoyett...@gmail.com |
++--+--+
