summaryrefslogtreecommitdiff
path: root/drivers/lguest
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/lguest')
-rw-r--r--drivers/lguest/x86/core.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c
index a6b717644be0..d6d7ac0982ab 100644
--- a/drivers/lguest/x86/core.c
+++ b/drivers/lguest/x86/core.c
@@ -324,6 +324,11 @@ static void rewrite_hypercall(struct lg_cpu *cpu)
u8 insn[3] = {0xcd, 0x1f, 0x90};
__lgwrite(cpu, guest_pa(cpu, cpu->regs->eip), insn, sizeof(insn));
+ /* The above write might have caused a copy of that page to be made
+ * (if it was read-only). We need to make sure the Guest has
+ * up-to-date pagetables. As this doesn't happen often, we can just
+ * drop them all. */
+ guest_pagetable_clear_all(cpu);
}
static bool is_hypercall(struct lg_cpu *cpu)