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selftests: kvm: s390: Add VM run test case

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Add test case running code interacting with registers within a
ucontrol VM.

* Add uc_gprs test case

The test uses the same VM setup using the fixture and debug macros
introduced in earlier patches in this series.

Signed-off-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20240807154512.316936-7-schlameuss@linux.ibm.com
[frankja@linux.ibm.com: Removed leftover comment line]
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-ID: <20240807154512.316936-7-schlameuss@linux.ibm.com>
This commit is contained in:
Christoph Schlameuss 2024-08-07 17:45:08 +02:00 committed by Janosch Frank
parent 100932fc37
commit 5bab087507
1 changed files with 125 additions and 0 deletions
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125
tools/testing/selftests/kvm/s390x/ucontrol_test.c
View File

@ -7,6 +7,7 @@
* Authors:
* Christoph Schlameuss <schlameuss@linux.ibm.com>
*/
#include "debug_print.h"
#include "kselftest_harness.h"
#include "kvm_util.h"
#include "processor.h"
@ -40,6 +41,23 @@ void require_ucontrol_admin(void)
TEST_REQUIRE(kvm_has_cap(KVM_CAP_S390_UCONTROL));
}
/* Test program setting some registers and looping */
extern char test_gprs_asm[];
asm("test_gprs_asm:\n"
"xgr %r0, %r0\n"
"lgfi %r1,1\n"
"lgfi %r2,2\n"
"lgfi %r3,3\n"
"lgfi %r4,4\n"
"lgfi %r5,5\n"
"lgfi %r6,6\n"
"lgfi %r7,7\n"
"0:\n"
" diag 0,0,0x44\n"
" ahi %r0,1\n"
" j 0b\n"
);
FIXTURE(uc_kvm)
{
struct kvm_s390_sie_block *sie_block;
@ -204,4 +222,111 @@ TEST(uc_cap_hpage)
close(kvm_fd);
}
/* verify SIEIC exit
* * fail on codes not expected in the test cases
*/
static bool uc_handle_sieic(FIXTURE_DATA(uc_kvm) * self)
{
struct kvm_s390_sie_block *sie_block = self->sie_block;
struct kvm_run *run = self->run;
/* check SIE interception code */
pr_info("sieic: 0x%.2x 0x%.4x 0x%.4x\n",
run->s390_sieic.icptcode,
run->s390_sieic.ipa,
run->s390_sieic.ipb);
switch (run->s390_sieic.icptcode) {
case ICPT_INST:
/* end execution in caller on intercepted instruction */
pr_info("sie instruction interception\n");
return false;
case ICPT_OPEREXC:
/* operation exception */
TEST_FAIL("sie exception on %.4x%.8x", sie_block->ipa, sie_block->ipb);
default:
TEST_FAIL("UNEXPECTED SIEIC CODE %d", run->s390_sieic.icptcode);
}
return true;
}
/* verify VM state on exit */
static bool uc_handle_exit(FIXTURE_DATA(uc_kvm) * self)
{
struct kvm_run *run = self->run;
switch (run->exit_reason) {
case KVM_EXIT_S390_SIEIC:
return uc_handle_sieic(self);
default:
pr_info("exit_reason %2d not handled\n", run->exit_reason);
}
return true;
}
/* run the VM until interrupted */
static int uc_run_once(FIXTURE_DATA(uc_kvm) * self)
{
int rc;
rc = ioctl(self->vcpu_fd, KVM_RUN, NULL);
print_run(self->run, self->sie_block);
print_regs(self->run);
pr_debug("run %d / %d %s\n", rc, errno, strerror(errno));
return rc;
}
static void uc_assert_diag44(FIXTURE_DATA(uc_kvm) * self)
{
struct kvm_s390_sie_block *sie_block = self->sie_block;
/* assert vm was interrupted by diag 0x0044 */
TEST_ASSERT_EQ(KVM_EXIT_S390_SIEIC, self->run->exit_reason);
TEST_ASSERT_EQ(ICPT_INST, sie_block->icptcode);
TEST_ASSERT_EQ(0x8300, sie_block->ipa);
TEST_ASSERT_EQ(0x440000, sie_block->ipb);
}
TEST_F(uc_kvm, uc_gprs)
{
struct kvm_sync_regs *sync_regs = &self->run->s.regs;
struct kvm_run *run = self->run;
struct kvm_regs regs = {};
/* Set registers to values that are different from the ones that we expect below */
for (int i = 0; i < 8; i++)
sync_regs->gprs[i] = 8;
run->kvm_dirty_regs |= KVM_SYNC_GPRS;
/* copy test_gprs_asm to code_hva / code_gpa */
TH_LOG("copy code %p to vm mapped memory %p / %p",
&test_gprs_asm, (void *)self->code_hva, (void *)self->code_gpa);
memcpy((void *)self->code_hva, &test_gprs_asm, PAGE_SIZE);
/* DAT disabled + 64 bit mode */
run->psw_mask = 0x0000000180000000ULL;
run->psw_addr = self->code_gpa;
/* run and expect interception of diag 44 */
ASSERT_EQ(0, uc_run_once(self));
ASSERT_EQ(false, uc_handle_exit(self));
uc_assert_diag44(self);
/* Retrieve and check guest register values */
ASSERT_EQ(0, ioctl(self->vcpu_fd, KVM_GET_REGS, &regs));
for (int i = 0; i < 8; i++) {
ASSERT_EQ(i, regs.gprs[i]);
ASSERT_EQ(i, sync_regs->gprs[i]);
}
/* run and expect interception of diag 44 again */
ASSERT_EQ(0, uc_run_once(self));
ASSERT_EQ(false, uc_handle_exit(self));
uc_assert_diag44(self);
/* check continued increment of register 0 value */
ASSERT_EQ(0, ioctl(self->vcpu_fd, KVM_GET_REGS, &regs));
ASSERT_EQ(1, regs.gprs[0]);
ASSERT_EQ(1, sync_regs->gprs[0]);
}
TEST_HARNESS_MAIN