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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 11:24:16 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 11:24:16 -0300
commit376027f2a3888ef3dec73ee41f85d90e51162d78 (patch)
treeac9a9030d31cadc92fdc4145a3d9bf379064721f /arch/x86/kernel
parente5fd91f1ef340da553f7a79da9540c3db711c937 (diff)
Add TuxOnIce support
Diffstat (limited to 'arch/x86/kernel')
-rw-r--r--arch/x86/kernel/espfix_64.c3
-rw-r--r--arch/x86/kernel/tsc.c5
2 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/espfix_64.c b/arch/x86/kernel/espfix_64.c
index ce95676ab..61059c4d0 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 7437b41f6..1b513e093 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)