Re: [PATCH v1 8/9] selftests: kvm: s390: Add uc_skey VM test case

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On Tue,  9 Jul 2024 14:57:03 +0200
Christoph Schlameuss <schlameuss@xxxxxxxxxxxxx> wrote:

> Add a test case manipulating s390 storage keys from within the ucontrol
> VM.
> 
> Signed-off-by: Christoph Schlameuss <schlameuss@xxxxxxxxxxxxx>
> ---
>  .../selftests/kvm/s390x/ucontrol_test.c       | 83 +++++++++++++++++++
>  1 file changed, 83 insertions(+)
> 
> diff --git a/tools/testing/selftests/kvm/s390x/ucontrol_test.c b/tools/testing/selftests/kvm/s390x/ucontrol_test.c
> index 4438cfc8bf53..64ad31f667e3 100644
> --- a/tools/testing/selftests/kvm/s390x/ucontrol_test.c
> +++ b/tools/testing/selftests/kvm/s390x/ucontrol_test.c
> @@ -81,6 +81,32 @@ asm("test_mem_pgm:\n"
>  	"	j	0b\n"
>  );
>  
> +/* Test program manipulating storage keys */
> +extern char test_skey_pgm[];
> +asm("test_skey_pgm:\n"
> +	"xgr	%r0, %r0\n"
> +
> +	"0:\n"
> +	"	ahi	%r0,1\n"
> +	"	st	%r1,0(%r5,%r6)\n"
> +
> +	"	iske	%r1,%r6\n"
> +	"	ahi	%r0,1\n"
> +	"	diag	0,0,0x44\n"
> +
> +	"	sske	%r1,%r6\n"
> +	"	iske	%r1,%r6\n"
> +	"	ahi	%r0,1\n"
> +	"	diag	0,0,0x44\n"
> +
> +	"	rrbe	%r1,%r6\n"
> +	"	iske	%r1,%r6\n"
> +	"	ahi	%r0,1\n"
> +	"	diag	0,0,0x44\n"
> +
> +	"	j	0b\n"
> +);
> +
>  FIXTURE(uc_kvm)
>  {
>  	struct kvm_s390_sie_block *sie_block;
> @@ -389,6 +415,63 @@ static void uc_assert_diag44(FIXTURE_DATA(uc_kvm) * self)
>  	TEST_ASSERT_EQ(0x440000, sie_block->ipb);
>  }
>  
> +TEST_F(uc_kvm, uc_skey)
> +{
> +	u64 test_vaddr = self->base_gpa + VM_MEM_SIZE - (SZ_1M / 2);
> +	struct kvm_sync_regs *sync_regs = &self->run->s.regs;
> +	struct kvm_s390_sie_block *sie_block = self->sie_block;
> +	struct kvm_run *run = self->run;
> +	u8 skeyvalue = 0x34;
> +
> +	init_st_pt(self);
> +
> +	/* copy test_skey_pgm to code_hva / code_gpa */
> +	TH_LOG("copy code %p to vm mapped memory %p / %p",
> +	       &test_skey_pgm, (void *)self->code_hva, (void *)self->code_gpa);
> +	memcpy((void *)self->code_hva, &test_skey_pgm, PAGE_SIZE);
> +
> +	/* set register content for test_skey_pgm to access not mapped memory*/

missing space before */

> +	sync_regs->gprs[1] = skeyvalue;
> +	sync_regs->gprs[5] = self->base_gpa;
> +	sync_regs->gprs[6] = test_vaddr;
> +	run->kvm_dirty_regs |= KVM_SYNC_GPRS;
> +
> +	run->kvm_dirty_regs |= KVM_SYNC_CRS;
> +	TH_LOG("set CR0 to 0x%llx", sync_regs->crs[0]);
> +
> +	self->sie_block->ictl |= ICTL_OPEREXC | ICTL_PINT;
> +	self->sie_block->cpuflags &= ~CPUSTAT_KSS;
> +	run->psw_mask = 0x0400000180000000ULL;  /* DAT enabled + 64 bit mode */
> +	run->psw_addr = self->code_gpa;
> +	ASSERT_EQ(0, uc_run_once(self));
> +	ASSERT_EQ(true, uc_handle_exit(self));
> +	ASSERT_EQ(0, sync_regs->gprs[0]);
> +	ASSERT_EQ(13, run->exit_reason);

can you use macros here instead of magic values?

> +	ASSERT_EQ(40, sie_block->icptcode);

same here

> +
> +	ASSERT_EQ(0, uc_run_once(self));
> +	ASSERT_EQ(false, uc_handle_exit(self));
> +	ASSERT_EQ(2, sync_regs->gprs[0]);
> +	ASSERT_EQ(0x06, sync_regs->gprs[1]);
> +	uc_assert_diag44(self);
> +
> +	sync_regs->gprs[1] = skeyvalue;
> +	run->kvm_dirty_regs |= KVM_SYNC_GPRS;
> +	ASSERT_EQ(0, uc_run_once(self));
> +	ASSERT_EQ(false, uc_handle_exit(self));
> +	ASSERT_EQ(3, sync_regs->gprs[0]);
> +	ASSERT_EQ(skeyvalue, sync_regs->gprs[1]);
> +	uc_assert_diag44(self);
> +
> +	sync_regs->gprs[1] = skeyvalue;
> +	run->kvm_dirty_regs |= KVM_SYNC_GPRS;
> +	ASSERT_EQ(0, uc_run_once(self));
> +	ASSERT_EQ(false, uc_handle_exit(self));
> +	ASSERT_EQ(4, sync_regs->gprs[0]);
> +	ASSERT_EQ(skeyvalue & 0xfb, sync_regs->gprs[1]);
> +	uc_assert_diag44(self);
> +}
> +
>  TEST_F(uc_kvm, uc_map_unmap)
>  {
>  	struct kvm_sync_regs *sync_regs = &self->run->s.regs;





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