* [kvm-unit-tests PATCH v1] s390x: spec_ex: Add test for misaligned load
@ 2023-03-01 13:26 Nina Schoetterl-Glausch
2023-03-06 10:59 ` Claudio Imbrenda
` (3 more replies)
0 siblings, 4 replies; 6+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-03-01 13:26 UTC (permalink / raw)
To: Thomas Huth, Janosch Frank, Claudio Imbrenda
Cc: Nina Schoetterl-Glausch, David Hildenbrand, kvm, linux-s390
The operand of LOAD RELATIVE LONG must be word aligned, otherwise a
specification exception occurs. Test that this exception occurs.
Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
---
Noticed while writing another test that TCG fails this requirement,
so thought it best do document this in the form of a test.
s390x/spec_ex.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/s390x/spec_ex.c b/s390x/spec_ex.c
index 42ecaed3..42e86070 100644
--- a/s390x/spec_ex.c
+++ b/s390x/spec_ex.c
@@ -136,7 +136,7 @@ static int short_psw_bit_12_is_0(void)
return 0;
}
-static int bad_alignment(void)
+static int bad_alignment_lqp(void)
{
uint32_t words[5] __attribute__((aligned(16)));
uint32_t (*bad_aligned)[4] = (uint32_t (*)[4])&words[1];
@@ -149,6 +149,22 @@ static int bad_alignment(void)
return 0;
}
+static int bad_alignment_lrl(void)
+{
+ uint64_t r;
+
+ asm volatile ( ".pushsection .rodata\n"
+ " .balign 4\n"
+ " . = . + 2\n"
+ "0: .fill 4\n"
+ " .popsection\n"
+
+ " lrl %0,0b\n"
+ : "=d" (r)
+ );
+ return 0;
+}
+
static int not_even(void)
{
uint64_t quad[2] __attribute__((aligned(16))) = {0};
@@ -176,7 +192,8 @@ struct spec_ex_trigger {
static const struct spec_ex_trigger spec_ex_triggers[] = {
{ "psw_bit_12_is_1", &psw_bit_12_is_1, false, &fixup_invalid_psw },
{ "short_psw_bit_12_is_0", &short_psw_bit_12_is_0, false, &fixup_invalid_psw },
- { "bad_alignment", &bad_alignment, true, NULL },
+ { "bad_alignment_lqp", &bad_alignment_lqp, true, NULL },
+ { "bad_alignment_lrl", &bad_alignment_lrl, true, NULL },
{ "not_even", ¬_even, true, NULL },
{ NULL, NULL, false, NULL },
};
base-commit: e3c5c3ef2524c58023073c0fadde2e8ae3c04ec6
--
2.36.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [kvm-unit-tests PATCH v1] s390x: spec_ex: Add test for misaligned load
2023-03-01 13:26 [kvm-unit-tests PATCH v1] s390x: spec_ex: Add test for misaligned load Nina Schoetterl-Glausch
@ 2023-03-06 10:59 ` Claudio Imbrenda
2023-03-06 11:31 ` Nina Schoetterl-Glausch
2023-03-20 12:22 ` Claudio Imbrenda
` (2 subsequent siblings)
3 siblings, 1 reply; 6+ messages in thread
From: Claudio Imbrenda @ 2023-03-06 10:59 UTC (permalink / raw)
To: Nina Schoetterl-Glausch
Cc: Thomas Huth, Janosch Frank, David Hildenbrand, kvm, linux-s390
On Wed, 1 Mar 2023 14:26:38 +0100
Nina Schoetterl-Glausch <nsg@linux.ibm.com> wrote:
> The operand of LOAD RELATIVE LONG must be word aligned, otherwise a
> specification exception occurs. Test that this exception occurs.
you're only testing halfword misalignment; would it make sense to test
all possible misalignments? (it's only 3 of them after all)
>
> Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
> ---
>
>
> Noticed while writing another test that TCG fails this requirement,
> so thought it best do document this in the form of a test.
>
>
> s390x/spec_ex.c | 21 +++++++++++++++++++--
> 1 file changed, 19 insertions(+), 2 deletions(-)
>
> diff --git a/s390x/spec_ex.c b/s390x/spec_ex.c
> index 42ecaed3..42e86070 100644
> --- a/s390x/spec_ex.c
> +++ b/s390x/spec_ex.c
> @@ -136,7 +136,7 @@ static int short_psw_bit_12_is_0(void)
> return 0;
> }
>
> -static int bad_alignment(void)
> +static int bad_alignment_lqp(void)
> {
> uint32_t words[5] __attribute__((aligned(16)));
> uint32_t (*bad_aligned)[4] = (uint32_t (*)[4])&words[1];
> @@ -149,6 +149,22 @@ static int bad_alignment(void)
> return 0;
> }
>
> +static int bad_alignment_lrl(void)
> +{
> + uint64_t r;
> +
> + asm volatile ( ".pushsection .rodata\n"
why not declare this as a local array?
uint8_t stuff[8] __attribute__((aligned(8)));
> + " .balign 4\n"
> + " . = . + 2\n"
> + "0: .fill 4\n"
> + " .popsection\n"
> +
> + " lrl %0,0b\n"
> + : "=d" (r)
and here pass stuff + 1 or something like that?
less asm = more readable
> + );
> + return 0;
> +}
> +
> static int not_even(void)
> {
> uint64_t quad[2] __attribute__((aligned(16))) = {0};
> @@ -176,7 +192,8 @@ struct spec_ex_trigger {
> static const struct spec_ex_trigger spec_ex_triggers[] = {
> { "psw_bit_12_is_1", &psw_bit_12_is_1, false, &fixup_invalid_psw },
> { "short_psw_bit_12_is_0", &short_psw_bit_12_is_0, false, &fixup_invalid_psw },
> - { "bad_alignment", &bad_alignment, true, NULL },
> + { "bad_alignment_lqp", &bad_alignment_lqp, true, NULL },
> + { "bad_alignment_lrl", &bad_alignment_lrl, true, NULL },
> { "not_even", ¬_even, true, NULL },
> { NULL, NULL, false, NULL },
> };
>
> base-commit: e3c5c3ef2524c58023073c0fadde2e8ae3c04ec6
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [kvm-unit-tests PATCH v1] s390x: spec_ex: Add test for misaligned load
2023-03-06 10:59 ` Claudio Imbrenda
@ 2023-03-06 11:31 ` Nina Schoetterl-Glausch
0 siblings, 0 replies; 6+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-03-06 11:31 UTC (permalink / raw)
To: Claudio Imbrenda
Cc: Thomas Huth, Janosch Frank, David Hildenbrand, kvm, linux-s390
On Mon, 2023-03-06 at 11:59 +0100, Claudio Imbrenda wrote:
> On Wed, 1 Mar 2023 14:26:38 +0100
> Nina Schoetterl-Glausch <nsg@linux.ibm.com> wrote:
>
> > The operand of LOAD RELATIVE LONG must be word aligned, otherwise a
> > specification exception occurs. Test that this exception occurs.
>
> you're only testing halfword misalignment; would it make sense to test
> all possible misalignments? (it's only 3 of them after all)
No, that's not possible, the address calculation is:
insn_addr + immediate * 2
So for LRL there is only one possible misalignment.
For LGRL there are multiple, tho.
>
> >
> > Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
> > ---
> >
> >
> > Noticed while writing another test that TCG fails this requirement,
> > so thought it best do document this in the form of a test.
> >
> >
> > s390x/spec_ex.c | 21 +++++++++++++++++++--
> > 1 file changed, 19 insertions(+), 2 deletions(-)
> >
> > diff --git a/s390x/spec_ex.c b/s390x/spec_ex.c
> > index 42ecaed3..42e86070 100644
> > --- a/s390x/spec_ex.c
> > +++ b/s390x/spec_ex.c
> > @@ -136,7 +136,7 @@ static int short_psw_bit_12_is_0(void)
> > return 0;
> > }
> >
> > -static int bad_alignment(void)
> > +static int bad_alignment_lqp(void)
> > {
> > uint32_t words[5] __attribute__((aligned(16)));
> > uint32_t (*bad_aligned)[4] = (uint32_t (*)[4])&words[1];
> > @@ -149,6 +149,22 @@ static int bad_alignment(void)
> > return 0;
> > }
> >
> > +static int bad_alignment_lrl(void)
> > +{
> > + uint64_t r;
> > +
> > + asm volatile ( ".pushsection .rodata\n"
>
> why not declare this as a local array?
I cannot put it on the stack, since I need a relative offset.
I guess I could use a global symbol, but that also makes the
test less self-contained.
>
> uint8_t stuff[8] __attribute__((aligned(8)));
>
> > + " .balign 4\n"
> > + " . = . + 2\n"
> > + "0: .fill 4\n"
> > + " .popsection\n"
> > +
> > + " lrl %0,0b\n"
> > + : "=d" (r)
>
> and here pass stuff + 1 or something like that?
>
> less asm = more readable
>
> > + );
> > + return 0;
> > +}
> > +
> > static int not_even(void)
> > {
> > uint64_t quad[2] __attribute__((aligned(16))) = {0};
> > @@ -176,7 +192,8 @@ struct spec_ex_trigger {
> > static const struct spec_ex_trigger spec_ex_triggers[] = {
> > { "psw_bit_12_is_1", &psw_bit_12_is_1, false, &fixup_invalid_psw },
> > { "short_psw_bit_12_is_0", &short_psw_bit_12_is_0, false, &fixup_invalid_psw },
> > - { "bad_alignment", &bad_alignment, true, NULL },
> > + { "bad_alignment_lqp", &bad_alignment_lqp, true, NULL },
> > + { "bad_alignment_lrl", &bad_alignment_lrl, true, NULL },
> > { "not_even", ¬_even, true, NULL },
> > { NULL, NULL, false, NULL },
> > };
> >
> > base-commit: e3c5c3ef2524c58023073c0fadde2e8ae3c04ec6
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [kvm-unit-tests PATCH v1] s390x: spec_ex: Add test for misaligned load
2023-03-01 13:26 [kvm-unit-tests PATCH v1] s390x: spec_ex: Add test for misaligned load Nina Schoetterl-Glausch
2023-03-06 10:59 ` Claudio Imbrenda
@ 2023-03-20 12:22 ` Claudio Imbrenda
2023-03-22 14:55 ` Nico Boehr
2023-03-23 12:42 ` Nico Boehr
3 siblings, 0 replies; 6+ messages in thread
From: Claudio Imbrenda @ 2023-03-20 12:22 UTC (permalink / raw)
To: Nina Schoetterl-Glausch
Cc: Thomas Huth, Janosch Frank, David Hildenbrand, kvm, linux-s390
On Wed, 1 Mar 2023 14:26:38 +0100
Nina Schoetterl-Glausch <nsg@linux.ibm.com> wrote:
> The operand of LOAD RELATIVE LONG must be word aligned, otherwise a
> specification exception occurs. Test that this exception occurs.
>
> Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
> ---
>
>
> Noticed while writing another test that TCG fails this requirement,
> so thought it best do document this in the form of a test.
>
>
> s390x/spec_ex.c | 21 +++++++++++++++++++--
> 1 file changed, 19 insertions(+), 2 deletions(-)
>
> diff --git a/s390x/spec_ex.c b/s390x/spec_ex.c
> index 42ecaed3..42e86070 100644
> --- a/s390x/spec_ex.c
> +++ b/s390x/spec_ex.c
> @@ -136,7 +136,7 @@ static int short_psw_bit_12_is_0(void)
> return 0;
> }
>
> -static int bad_alignment(void)
> +static int bad_alignment_lqp(void)
> {
> uint32_t words[5] __attribute__((aligned(16)));
> uint32_t (*bad_aligned)[4] = (uint32_t (*)[4])&words[1];
> @@ -149,6 +149,22 @@ static int bad_alignment(void)
> return 0;
> }
>
> +static int bad_alignment_lrl(void)
> +{
> + uint64_t r;
> +
> + asm volatile ( ".pushsection .rodata\n"
> + " .balign 4\n"
> + " . = . + 2\n"
> + "0: .fill 4\n"
> + " .popsection\n"
> +
> + " lrl %0,0b\n"
> + : "=d" (r)
> + );
> + return 0;
> +}
> +
> static int not_even(void)
> {
> uint64_t quad[2] __attribute__((aligned(16))) = {0};
> @@ -176,7 +192,8 @@ struct spec_ex_trigger {
> static const struct spec_ex_trigger spec_ex_triggers[] = {
> { "psw_bit_12_is_1", &psw_bit_12_is_1, false, &fixup_invalid_psw },
> { "short_psw_bit_12_is_0", &short_psw_bit_12_is_0, false, &fixup_invalid_psw },
> - { "bad_alignment", &bad_alignment, true, NULL },
> + { "bad_alignment_lqp", &bad_alignment_lqp, true, NULL },
> + { "bad_alignment_lrl", &bad_alignment_lrl, true, NULL },
> { "not_even", ¬_even, true, NULL },
> { NULL, NULL, false, NULL },
> };
>
> base-commit: e3c5c3ef2524c58023073c0fadde2e8ae3c04ec6
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [kvm-unit-tests PATCH v1] s390x: spec_ex: Add test for misaligned load
2023-03-01 13:26 [kvm-unit-tests PATCH v1] s390x: spec_ex: Add test for misaligned load Nina Schoetterl-Glausch
2023-03-06 10:59 ` Claudio Imbrenda
2023-03-20 12:22 ` Claudio Imbrenda
@ 2023-03-22 14:55 ` Nico Boehr
2023-03-23 12:42 ` Nico Boehr
3 siblings, 0 replies; 6+ messages in thread
From: Nico Boehr @ 2023-03-22 14:55 UTC (permalink / raw)
To: Claudio Imbrenda, Janosch Frank, Nina Schoetterl-Glausch, Thomas Huth
Cc: Nina Schoetterl-Glausch, David Hildenbrand, kvm, linux-s390
Quoting Nina Schoetterl-Glausch (2023-03-01 14:26:38)
> The operand of LOAD RELATIVE LONG must be word aligned, otherwise a
> specification exception occurs. Test that this exception occurs.
>
> Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [kvm-unit-tests PATCH v1] s390x: spec_ex: Add test for misaligned load
2023-03-01 13:26 [kvm-unit-tests PATCH v1] s390x: spec_ex: Add test for misaligned load Nina Schoetterl-Glausch
` (2 preceding siblings ...)
2023-03-22 14:55 ` Nico Boehr
@ 2023-03-23 12:42 ` Nico Boehr
3 siblings, 0 replies; 6+ messages in thread
From: Nico Boehr @ 2023-03-23 12:42 UTC (permalink / raw)
To: Claudio Imbrenda, Janosch Frank, Nina Schoetterl-Glausch, Thomas Huth
Cc: Nina Schoetterl-Glausch, David Hildenbrand, kvm, linux-s390
Quoting Nina Schoetterl-Glausch (2023-03-01 14:26:38)
> The operand of LOAD RELATIVE LONG must be word aligned, otherwise a
> specification exception occurs. Test that this exception occurs.
>
> Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
queued, thanks.
^ permalink raw reply [flat|nested] 6+ messages in thread
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2023-03-06 11:31 ` Nina Schoetterl-Glausch
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