xen: don't use privcmd_call() from xen_mc_flush()

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Using privcmd_call() for a singleton multicall seems to be wrong, as
privcmd_call() is using stac()/clac() to enable hypervisor access to
Linux user space.

Even if currently not a problem (pv domains can't use SMAP while HVM
and PVH domains can't use multicalls) things might change when
PVH dom0 support is added to the kernel.

Reported-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

...

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Juergen Gross 2018-06-13 11:58:06 +02:00 • committed by Boris Ostrovsky

parent 405c018a25

commit cd9139220b

2 changed files with 22 additions and 9 deletions

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25

arch/x86/include/asm/xen/hypercall.h

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6

arch/x86/xen/multicalls.c

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