In preparation for restoring xen_set_pte_init()'s original behavior of avoiding hypercalls, make set_pte_mfn() no longer use the standard set_pte() code path. That one is more complicated than the alternative of simply using an available hypercall directly. This way we can avoid introducing a fair number (2k on my test system) of cases where the hypervisor would trap-and-emulate page table updates.
Signed-off-by: Jan Beulich <[email protected]> --- a/arch/x86/xen/mmu_pv.c +++ b/arch/x86/xen/mmu_pv.c @@ -241,9 +241,11 @@ static void xen_set_pmd(pmd_t *ptr, pmd_ * Associate a virtual page frame with a given physical page frame * and protection flags for that frame. */ -void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags) +void __init set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags) { - set_pte_vaddr(vaddr, mfn_pte(mfn, flags)); + if (HYPERVISOR_update_va_mapping(vaddr, mfn_pte(mfn, flags), + UVMF_INVLPG)) + BUG(); } static bool xen_batched_set_pte(pte_t *ptep, pte_t pteval)
