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KVM: selftests: Add support for DIV and IDIV in the fastops test

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Extend the fastops test coverage to DIV and IDIV, specifically to provide
coverage for #DE (divide error) exceptions, as #DE is the only exception
that can occur in KVM's fastops path, i.e. that requires exception fixup.

Link: https://lore.kernel.org/r/20250909202835.333554-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2025-09-09 13:28:35 -07:00
parent fe08478b1d
commit aebc62b3de
1 changed files with 38 additions and 0 deletions
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38
tools/testing/selftests/kvm/x86/fastops_test.c
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@ -92,6 +92,42 @@
ex_flags, insn, shift, (uint64_t)input, flags); \
})
#define guest_execute_fastop_div(__KVM_ASM_SAFE, insn, __a, __d, __rm, __flags) \
({ \
uint64_t ign_error_code; \
uint8_t vector; \
\
__asm__ __volatile__(fastop(__KVM_ASM_SAFE(insn " %[denom]")) \
: "+a"(__a), "+d"(__d), flags_constraint(__flags), \
KVM_ASM_SAFE_OUTPUTS(vector, ign_error_code) \
: [denom]"rm"(__rm), bt_constraint(__rm) \
: "cc", "memory", KVM_ASM_SAFE_CLOBBERS); \
vector; \
})
#define guest_test_fastop_div(insn, type_t, __val1, __val2) \
({ \
type_t _a = __val1, _d = __val1, rm = __val2; \
type_t a = _a, d = _d, ex_a = _a, ex_d = _d; \
uint64_t flags, ex_flags; \
uint8_t v, ex_v; \
\
ex_v = guest_execute_fastop_div(KVM_ASM_SAFE, insn, ex_a, ex_d, rm, ex_flags); \
v = guest_execute_fastop_div(KVM_ASM_SAFE_FEP, insn, a, d, rm, flags); \
\
GUEST_ASSERT_EQ(v, ex_v); \
__GUEST_ASSERT(v == ex_v, \
"Wanted vector 0x%x for '%s 0x%lx:0x%lx/0x%lx', got 0x%x", \
ex_v, insn, (uint64_t)_a, (uint64_t)_d, (uint64_t)rm, v); \
__GUEST_ASSERT(a == ex_a && d == ex_d, \
"Wanted 0x%lx:0x%lx for '%s 0x%lx:0x%lx/0x%lx', got 0x%lx:0x%lx",\
(uint64_t)ex_a, (uint64_t)ex_d, insn, (uint64_t)_a, \
(uint64_t)_d, (uint64_t)rm, (uint64_t)a, (uint64_t)d); \
__GUEST_ASSERT(v || ex_v || (flags == ex_flags), \
"Wanted flags 0x%lx for '%s 0x%lx:0x%lx/0x%lx', got 0x%lx", \
ex_flags, insn, (uint64_t)_a, (uint64_t)_d, (uint64_t)rm, flags);\
})
static const uint64_t vals[] = {
0,
1,
@ -141,6 +177,8 @@ if (sizeof(type_t) != 1) { \
guest_test_fastop_cl("sar" suffix, type_t, vals[i], vals[j]); \
guest_test_fastop_cl("shl" suffix, type_t, vals[i], vals[j]); \
guest_test_fastop_cl("shr" suffix, type_t, vals[i], vals[j]); \
\
guest_test_fastop_div("div" suffix, type_t, vals[i], vals[j]); \
} \
} \
} while (0)