[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RESEND v9 06/14] arch/x86: cleanup memory_mapping DOMCTL
This commit lets the end mfn be computed only once while handling a XEN_DOMCTL_memory_mapping hypercall. Also, the name of the tmp_rc local variable is changed to rc. Signed-off-by: Arianna Avanzini <avanzini.arianna@xxxxxxxxx> Acked-by: Jan Beulich <JBeulich@xxxxxxxx> Cc: Dario Faggioli <dario.faggioli@xxxxxxxxxx> Cc: Paolo Valente <paolo.valente@xxxxxxxxxx> Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> Cc: Julien Grall <julien.grall@xxxxxxxxxx> Cc: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx> Cc: Keir Fraser <keir@xxxxxxx> Cc: Tim Deegan <tim@xxxxxxx> Cc: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Cc: Eric Trudeau <etrudeau@xxxxxxxxxxxx> Cc: Viktor Kleinik <viktor.kleinik@xxxxxxxxxxxxxxx> --- xen/arch/x86/domctl.c | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-) diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c index db64ee0..f991bbb 100644 --- a/xen/arch/x86/domctl.c +++ b/xen/arch/x86/domctl.c @@ -646,19 +646,20 @@ long arch_do_domctl( unsigned long gfn = domctl->u.memory_mapping.first_gfn; unsigned long mfn = domctl->u.memory_mapping.first_mfn; unsigned long nr_mfns = domctl->u.memory_mapping.nr_mfns; + unsigned long mfn_end = mfn + nr_mfns - 1; int add = domctl->u.memory_mapping.add_mapping; ret = -EINVAL; - if ( (mfn + nr_mfns - 1) < mfn || /* wrap? */ - ((mfn | (mfn + nr_mfns - 1)) >> (paddr_bits - PAGE_SHIFT)) || + if ( mfn_end < mfn || /* wrap? */ + ((mfn | mfn_end) >> (paddr_bits - PAGE_SHIFT)) || (gfn + nr_mfns - 1) < gfn ) /* wrap? */ break; ret = -EPERM; - if ( !iomem_access_permitted(current->domain, mfn, mfn + nr_mfns - 1) ) + if ( !iomem_access_permitted(current->domain, mfn, mfn_end) ) break; - ret = xsm_iomem_mapping(XSM_HOOK, d, mfn, mfn + nr_mfns - 1, add); + ret = xsm_iomem_mapping(XSM_HOOK, d, mfn, mfn_end, add); if ( ret ) break; @@ -668,7 +669,7 @@ long arch_do_domctl( "memory_map:add: dom%d gfn=%lx mfn=%lx nr=%lx\n", d->domain_id, gfn, mfn, nr_mfns); - ret = iomem_permit_access(d, mfn, mfn + nr_mfns - 1); + ret = iomem_permit_access(d, mfn, mfn_end); if ( !ret && paging_mode_translate(d) ) { for ( i = 0; !ret && i < nr_mfns; i++ ) @@ -680,17 +681,17 @@ long arch_do_domctl( d->domain_id, gfn + i, mfn + i, ret); while ( i-- ) clear_mmio_p2m_entry(d, gfn + i, _mfn(mfn + i)); - if ( iomem_deny_access(d, mfn, mfn + nr_mfns - 1) && + if ( iomem_deny_access(d, mfn, mfn_end) && is_hardware_domain(current->domain) ) printk(XENLOG_ERR "memory_map: failed to deny dom%d access to [%lx,%lx]\n", - d->domain_id, mfn, mfn + nr_mfns - 1); + d->domain_id, mfn, mfn_end); } } } else { - int tmp_rc = 0; + int rc = 0; printk(XENLOG_G_INFO "memory_map:remove: dom%d gfn=%lx mfn=%lx nr=%lx\n", @@ -701,16 +702,16 @@ long arch_do_domctl( { ret = clear_mmio_p2m_entry(d, gfn + i, _mfn(mfn + i)); if ( ret ) - tmp_rc = ret; + rc = ret; } - ret = iomem_deny_access(d, mfn, mfn + nr_mfns - 1); + ret = iomem_deny_access(d, mfn, mfn_end); if ( !ret ) - ret = tmp_rc; + ret = rc; if ( ret && is_hardware_domain(current->domain) ) printk(XENLOG_ERR "memory_map: error %ld %s dom%d access to [%lx,%lx]\n", - ret, tmp_rc ? "removing" : "denying", d->domain_id, - mfn, mfn + nr_mfns - 1); + ret, rc ? "removing" : "denying", d->domain_id, + mfn, mfn_end); } /* Do this unconditionally to cover errors on above failure paths. */ memory_type_changed(d); -- 1.9.3 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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