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selftests: KVM: s390: fix early guest crash

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The guest crashes very early due to changes in the control registers
used by dynamic address translation. Let us use different registers
that will not crash the guest.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Christian Borntraeger 2020-03-10 09:01:40 -04:00 committed by Paolo Bonzini
parent 94c4b76b88
commit 41cbed5b07
1 changed files with 13 additions and 14 deletions
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27
tools/testing/selftests/kvm/s390x/resets.c
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@ -23,25 +23,24 @@ struct kvm_run *run;
struct kvm_sync_regs *regs;
static uint64_t regs_null[16];
static uint64_t crs[16] = { 0x40000ULL,
0x42000ULL,
0, 0, 0, 0, 0,
0x43000ULL,
0, 0, 0, 0, 0,
0x44000ULL,
0, 0
};
static void guest_code_initial(void)
{
/* Round toward 0 */
uint32_t fpc = 0x11;
/* set several CRs to "safe" value */
unsigned long cr2_59 = 0x10; /* enable guarded storage */
unsigned long cr8_63 = 0x1; /* monitor mask = 1 */
unsigned long cr10 = 1; /* PER START */
unsigned long cr11 = -1; /* PER END */
/* Dirty registers */
asm volatile (
" lctlg 0,15,%0\n"
" sfpc %1\n"
: : "Q" (crs), "d" (fpc));
" lghi 2,0x11\n" /* Round toward 0 */
" sfpc 2\n" /* set fpc to !=0 */
" lctlg 2,2,%0\n"
" lctlg 8,8,%1\n"
" lctlg 10,10,%2\n"
" lctlg 11,11,%3\n"
: : "m" (cr2_59), "m" (cr8_63), "m" (cr10), "m" (cr11) : "2");
GUEST_SYNC(0);
}