diff options
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/espfix_64.c | 3 | ||||
| -rw-r--r-- | arch/x86/kernel/tsc.c | 5 |
2 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/espfix_64.c b/arch/x86/kernel/espfix_64.c index 4d38416e2..a457bce46 100644 --- a/arch/x86/kernel/espfix_64.c +++ b/arch/x86/kernel/espfix_64.c @@ -173,6 +173,7 @@ void init_espfix_ap(int cpu) struct page *page = alloc_pages_node(node, PGALLOC_GFP, 0); pmd_p = (pmd_t *)page_address(page); + SetPageTOI_Untracked(virt_to_page(pmd_p)); pud = __pud(__pa(pmd_p) | (PGTABLE_PROT & ptemask)); paravirt_alloc_pmd(&init_mm, __pa(pmd_p) >> PAGE_SHIFT); for (n = 0; n < ESPFIX_PUD_CLONES; n++) @@ -185,6 +186,7 @@ void init_espfix_ap(int cpu) struct page *page = alloc_pages_node(node, PGALLOC_GFP, 0); pte_p = (pte_t *)page_address(page); + SetPageTOI_Untracked(virt_to_page(pte_p)); pmd = __pmd(__pa(pte_p) | (PGTABLE_PROT & ptemask)); paravirt_alloc_pte(&init_mm, __pa(pte_p) >> PAGE_SHIFT); for (n = 0; n < ESPFIX_PMD_CLONES; n++) @@ -193,6 +195,7 @@ void init_espfix_ap(int cpu) pte_p = pte_offset_kernel(&pmd, addr); stack_page = page_address(alloc_pages_node(node, GFP_KERNEL, 0)); + SetPageTOI_Untracked(virt_to_page(stack_page)); pte = __pte(__pa(stack_page) | (__PAGE_KERNEL_RO & ptemask)); for (n = 0; n < ESPFIX_PTE_CLONES; n++) set_pte(&pte_p[n*PTE_STRIDE], pte); diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 3d743da82..4b20bb75b 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -12,6 +12,7 @@ #include <linux/percpu.h> #include <linux/timex.h> #include <linux/static_key.h> +#include <linux/mm.h> #include <asm/hpet.h> #include <asm/timer.h> @@ -195,6 +196,10 @@ static void cyc2ns_init(int cpu) c2n->head = c2n->data; c2n->tail = c2n->data; + + // Don't let TuxOnIce make data RO - a secondary CPU will cause a triple fault + // if it loads microcode, which then does a printk, which may end up invoking cycles_2_ns + SetPageTOI_Untracked(virt_to_page(c2n)); } static inline unsigned long long cycles_2_ns(unsigned long long cyc) |