[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [V9 PATCH 4/8] pvh dom0: Add checks and restrictions for p2m_is_foreign
In this patch, we add some checks and restrictions in the relevant p2m paths for p2m_is_foreign. Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx> --- xen/arch/x86/mm/p2m-ept.c | 1 + xen/arch/x86/mm/p2m.c | 12 +++++++++--- xen/include/asm-x86/p2m.h | 1 + 3 files changed, 11 insertions(+), 3 deletions(-) diff --git a/xen/arch/x86/mm/p2m-ept.c b/xen/arch/x86/mm/p2m-ept.c index 1728b57..e6a0ef4 100644 --- a/xen/arch/x86/mm/p2m-ept.c +++ b/xen/arch/x86/mm/p2m-ept.c @@ -657,6 +657,7 @@ static void ept_change_entry_type_global(struct p2m_domain *p2m, BUG_ON(p2m_is_grant(ot) || p2m_is_grant(nt)); BUG_ON(ot != nt && (ot == p2m_mmio_direct || nt == p2m_mmio_direct)); + BUG_ON(p2m_is_foreign(nt) || (p2m_is_foreign(ot) && !p2m_is_invalid(nt))); ept_change_entry_type_page(_mfn(ept_get_asr(ept)), ept_get_wl(ept), ot, nt); diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c index 9edf8c7..996408a 100644 --- a/xen/arch/x86/mm/p2m.c +++ b/xen/arch/x86/mm/p2m.c @@ -547,6 +547,10 @@ guest_physmap_add_entry(struct domain *d, unsigned long gfn, return 0; } + /* foreign pages are added thru p2m_add_foreign */ + if ( p2m_is_foreign(t) ) + return -EINVAL; + p2m_lock(p2m); P2M_DEBUG("adding gfn=%#lx mfn=%#lx\n", gfn, mfn); @@ -581,9 +585,9 @@ guest_physmap_add_entry(struct domain *d, unsigned long gfn, omfn = p2m->get_entry(p2m, gfn + i, &ot, &a, 0, NULL); ASSERT(!p2m_is_shared(ot)); } - if ( p2m_is_grant(ot) ) + if ( p2m_is_grant(ot) || p2m_is_foreign(ot) ) { - /* Really shouldn't be unmapping grant maps this way */ + /* Really shouldn't be unmapping grant/foreign maps this way */ domain_crash(d); p2m_unlock(p2m); @@ -685,6 +689,7 @@ p2m_type_t p2m_change_type(struct domain *d, unsigned long gfn, struct p2m_domain *p2m = p2m_get_hostp2m(d); BUG_ON(p2m_is_grant(ot) || p2m_is_grant(nt)); + BUG_ON(p2m_is_foreign(nt) || (p2m_is_foreign(ot) && !p2m_is_invalid(nt))); gfn_lock(p2m, gfn, 0); @@ -709,6 +714,7 @@ void p2m_change_type_range(struct domain *d, struct p2m_domain *p2m = p2m_get_hostp2m(d); BUG_ON(p2m_is_grant(ot) || p2m_is_grant(nt)); + BUG_ON(p2m_is_foreign(nt) || (p2m_is_foreign(ot) && !p2m_is_invalid(nt))); p2m_lock(p2m); p2m->defer_nested_flush = 1; @@ -759,7 +765,7 @@ static int set_typed_p2m_entry(struct domain *d, unsigned long gfn, mfn_t mfn, gfn_lock(p2m, gfn, 0); omfn = p2m->get_entry(p2m, gfn, &ot, &a, 0, NULL); - if ( p2m_is_grant(ot) ) + if ( p2m_is_grant(ot) || p2m_is_foreign(ot) ) { p2m_unlock(p2m); domain_crash(d); diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h index 8aab0ad..7aa71cc 100644 --- a/xen/include/asm-x86/p2m.h +++ b/xen/include/asm-x86/p2m.h @@ -164,6 +164,7 @@ typedef unsigned int p2m_query_t; #define P2M_BROKEN_TYPES (p2m_to_mask(p2m_ram_broken)) /* Useful predicates */ +#define p2m_is_invalid(_t) (p2m_to_mask(_t) & p2m_to_mask(p2m_invalid)) #define p2m_is_ram(_t) (p2m_to_mask(_t) & P2M_RAM_TYPES) #define p2m_is_hole(_t) (p2m_to_mask(_t) & P2M_HOLE_TYPES) #define p2m_is_mmio(_t) (p2m_to_mask(_t) & P2M_MMIO_TYPES) -- 1.8.3.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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