On Wed, Feb 8, 2017 at 11:12 AM, George Dunlap <george.dun...@citrix.com> wrote:
> On 08/02/17 17:29, Tim Deegan wrote: > > At 17:22 +0000 on 08 Feb (1486574546), George Dunlap wrote: > >> Commit 71bb7304e7a7a35ea6df4b0cedebc35028e4c159 added flushing of > >> nested p2m tables whenever the host p2m table changed. Unfortunately > >> in the process, it added a filter to p2m_flush_table() function so > >> that the p2m would only be flushed if it was being used as a nested > >> p2m. This meant that the p2m was not being flushed at all for altp2m > >> callers. > >> > >> Only check np2m_base if p2m_class is set to p2m_nested. > >> > >> NB that this is not a security issue: The only time this codepath is > >> called is in cases where either nestedp2m or altp2m is enabled, and > >> neither of them are in security support. > >> > >> Reported-by: Matt Leinhos <m...@starlab.io> > >> Signed-off-by: George Dunlap <george.dun...@citrix.com> > >> CC: Tamas K Lengyel <tamas.leng...@zentific.com> > >> --- > >> xen/arch/x86/mm/p2m.c | 4 +++- > >> 1 file changed, 3 insertions(+), 1 deletion(-) > >> > >> diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c > >> index 6548e9f..0af2ec1 100644 > >> --- a/xen/arch/x86/mm/p2m.c > >> +++ b/xen/arch/x86/mm/p2m.c > >> @@ -1627,7 +1627,9 @@ p2m_flush_table(struct p2m_domain *p2m) > >> ASSERT(page_list_empty(&p2m->pod.super)); > >> ASSERT(page_list_empty(&p2m->pod.single)); > >> > >> - if ( p2m->np2m_base == P2M_BASE_EADDR ) > >> + /* No need to flush if it's already empty */ > >> + if ( p2m->p2m_class == p2m_nested && > >> + p2m->np2m_base == P2M_BASE_EADDR ) > > > > Looks like p2m_is_nestedp2m(p2m) is the usual idiom. Either way: > > > > Reviewed-by: Tim Deegan <t...@xen.org> > > Right -- I'll change it to the usual idiom and check it in after I've > gotten a test report (or waited a reasonable amount of time). Tested-by: Tamas K Lengyel <ta...@tklengyel.com>
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