From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Guangrong Subject: [PATCH] emulator test: add "rep ins" mmio access test Date: Fri, 19 Oct 2012 15:39:08 +0800 Message-ID: <5081039C.1040303@linux.vnet.ibm.com> References: <5081033C.4060503@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Avi Kivity , Marcelo Tosatti , Gleb Natapov , LKML , KVM To: Xiao Guangrong Return-path: In-Reply-To: <5081033C.4060503@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org 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 --- 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