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KVM: selftests: Assert that XTILE is XSAVE-enabled

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Assert that XTILE is XSAVE-enabled. check_xsave_supports_xtile() doesn't
actually check anything since its return value is not used. Add the
intended assert.

Opportunistically, move the assert to a more appropriate location:
immediately after XSETBV and remove check_xsave_supports_xtile().

Fixes: 5dc19f1c7d ("KVM: selftests: Convert AMX test to use X86_PROPRETY_XXX")
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
Link: https://lore.kernel.org/r/20230221163655.920289-10-mizhang@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Aaron Lewis 2023-02-21 16:36:51 +00:00 committed by Sean Christopherson
parent bfc5afc37c
commit 7e1075f050
1 changed files with 1 additions and 6 deletions
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7
tools/testing/selftests/kvm/x86_64/amx_test.c
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@ -115,11 +115,6 @@ static inline void check_cpuid_xsave(void)
GUEST_ASSERT(this_cpu_has(X86_FEATURE_OSXSAVE));
}
static bool check_xsave_supports_xtile(void)
{
return __xgetbv(0) & XFEATURE_MASK_XTILE;
}
static void check_xtile_info(void)
{
GUEST_ASSERT(this_cpu_has_p(X86_PROPERTY_XSTATE_MAX_SIZE_XCR0));
@ -166,6 +161,7 @@ static void init_regs(void)
xcr0 = __xgetbv(0);
xcr0 |= XFEATURE_MASK_XTILE;
__xsetbv(0x0, xcr0);
GUEST_ASSERT(__xgetbv(0) & XFEATURE_MASK_XTILE);
}
static void __attribute__((__flatten__)) guest_code(struct tile_config *amx_cfg,
@ -174,7 +170,6 @@ static void __attribute__((__flatten__)) guest_code(struct tile_config *amx_cfg,
{
init_regs();
check_cpuid_xsave();
check_xsave_supports_xtile();
check_xtile_info();
GUEST_SYNC(1);