From: Jan Beulich Date: Thu, 30 Sep 2021 12:35:52 +0000 (+0200) Subject: xen/x86: adjust xen_set_fixmap() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4c360db6ccdb12d82c5c255c90c249970f5d1956;p=linux.git xen/x86: adjust xen_set_fixmap() Using __native_set_fixmap() here means guaranteed trap-and-emulate instances the hypervisor has to deal with. Since the virtual address covered by the to be adjusted page table entry is easy to determine (and actually already gets obtained in a special case), simply use an available, easy to invoke hypercall instead. Signed-off-by: Jan Beulich Reviewed-by: Boris Ostrovsky Link: https://lore.kernel.org/r/11fcaea2-ec17-3edd-ecdf-4cdd2d472bd0@suse.com Signed-off-by: Boris Ostrovsky --- diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c index 7b366e252e032..ad0fbc7e48729 100644 --- a/arch/x86/xen/mmu_pv.c +++ b/arch/x86/xen/mmu_pv.c @@ -2011,6 +2011,7 @@ static unsigned char dummy_mapping[PAGE_SIZE] __page_aligned_bss; static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot) { pte_t pte; + unsigned long vaddr; phys >>= PAGE_SHIFT; @@ -2051,15 +2052,15 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot) break; } - __native_set_fixmap(idx, pte); + vaddr = __fix_to_virt(idx); + if (HYPERVISOR_update_va_mapping(vaddr, pte, UVMF_INVLPG)) + BUG(); #ifdef CONFIG_X86_VSYSCALL_EMULATION /* Replicate changes to map the vsyscall page into the user pagetable vsyscall mapping. */ - if (idx == VSYSCALL_PAGE) { - unsigned long vaddr = __fix_to_virt(idx); + if (idx == VSYSCALL_PAGE) set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte); - } #endif }