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KVM: s390: selftests: memop: add a simple AR test

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There is a selftest that checks for an (expected) error when an
invalid AR is specified, but not one that exercises the AR path.

Add a simple test that mirrors the vanilla write/read test while
providing an AR. An AR that contains zero will direct the CPU to
use the primary address space normally used anyway. AR[1] is
selected for this test because the host AR[1] is usually non-zero,
and KVM needs to correctly swap those values.

Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Link: https://lore.kernel.org/r/20240220211211.3102609-3-farman@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Eric Farman 2024-02-20 22:12:11 +01:00 committed by Heiko Carstens
parent 01be7f53df
commit 559a146290
1 changed files with 31 additions and 0 deletions
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31
tools/testing/selftests/kvm/s390x/memop.c
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@ -375,6 +375,32 @@ static void test_copy(void)
kvm_vm_free(t.kvm_vm);
}
static void test_copy_access_register(void)
{
struct test_default t = test_default_init(guest_copy);
HOST_SYNC(t.vcpu, STAGE_INITED);
prepare_mem12();
t.run->psw_mask &= ~(3UL << (63 - 17));
t.run->psw_mask |= 1UL << (63 - 17); /* Enable AR mode */
/*
* Primary address space gets used if an access register
* contains zero. The host makes use of AR[1] so is a good
* candidate to ensure the guest AR (of zero) is used.
*/
CHECK_N_DO(MOP, t.vcpu, LOGICAL, WRITE, mem1, t.size,
GADDR_V(mem1), AR(1));
HOST_SYNC(t.vcpu, STAGE_COPIED);
CHECK_N_DO(MOP, t.vcpu, LOGICAL, READ, mem2, t.size,
GADDR_V(mem2), AR(1));
ASSERT_MEM_EQ(mem1, mem2, t.size);
kvm_vm_free(t.kvm_vm);
}
static void set_storage_key_range(void *addr, size_t len, uint8_t key)
{
uintptr_t _addr, abs, i;
@ -1101,6 +1127,11 @@ int main(int argc, char *argv[])
.test = test_copy_key_fetch_prot_override,
.requirements_met = extension_cap > 0,
},
{
.name = "copy with access register mode",
.test = test_copy_access_register,
.requirements_met = true,
},
{
.name = "error checks with key",
.test = test_errors_key,