Add the test to trigger the bug that "rep ins" causes vcpu->mmio_fragments
overflow overflow while move large data from ioport to MMIO
Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
---
x86/emulator.c | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/x86/emulator.c b/x86/emulator.c
index 24b33d1..0735405 100644
--- a/x86/emulator.c
+++ b/x86/emulator.c
@@ -731,6 +731,18 @@ static void test_crosspage_mmio(volatile uint8_t *mem)
report("cross-page mmio write", mem[4095] == 0xaa && mem[4096] == 0x88);
}
+static void test_string_io_mmio(volatile uint8_t *mem)
+{
+ /* Cross MMIO pages.*/
+ volatile uint8_t *mmio = mem + 4032;
+
+ asm volatile("outw %%ax, %%dx \n\t" : : "a"(0x9999), "d"(TESTDEV_IO_PORT));
+
+ asm volatile ("cld; rep insb" : : "d" (TESTDEV_IO_PORT), "D" (mmio), "c" (1024));
+
+ report("string_io_mmio", mmio[1023] == 0x99);
+}
+
static void test_lgdt_lidt(volatile uint8_t *mem)
{
struct descriptor_table_ptr orig, fresh = {};
@@ -878,6 +890,8 @@ int main()
test_crosspage_mmio(mem);
+ test_string_io_mmio(mem);
+
printf("\nSUMMARY: %d tests, %d failures\n", tests, fails);
return fails ? 1 : 0;
}
--
1.7.7.6
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