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| author | Mingwei Zhang <mizhang@google.com> | 2023-02-21 16:36:50 +0000 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2023-03-24 14:21:39 -0700 |
| commit | bfc5afc37c9dba85f8c057fb85109a72e72d64a5 (patch) | |
| tree | d54d27b7c1d087de3cd82ff6b32cf284ea49f5d3 /tools/testing | |
| parent | 9cbd9aaa670f7be61ba569f5c3ebafc2e0aabeb6 (diff) | |
| download | linux-bfc5afc37c9dba85f8c057fb85109a72e72d64a5.tar.gz linux-bfc5afc37c9dba85f8c057fb85109a72e72d64a5.tar.bz2 linux-bfc5afc37c9dba85f8c057fb85109a72e72d64a5.zip | |
KVM: selftests: Verify XTILE_DATA in XSTATE isn't affected by IA32_XFD
Add asserts to verify the XSTATE metadata for XTILE_DATA isn't affected
by disabling AMX tile data via IA32_XFD. XFD doesn't intercept XSAVE,
it only prevents setting bits in XCR0, i.e. regardless of XFD, AMX state
is managed by XSAVE/XRSTOR as long as the corresponding bits are set XCR0.
Signed-off-by: Mingwei Zhang <mizhang@google.com>
Link: https://lore.kernel.org/r/20230221163655.920289-9-mizhang@google.com
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'tools/testing')
| -rw-r--r-- | tools/testing/selftests/kvm/x86_64/amx_test.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/amx_test.c b/tools/testing/selftests/kvm/x86_64/amx_test.c index cd0491cc7c8c..e6bc6cd108dc 100644 --- a/tools/testing/selftests/kvm/x86_64/amx_test.c +++ b/tools/testing/selftests/kvm/x86_64/amx_test.c @@ -201,6 +201,16 @@ static void __attribute__((__flatten__)) guest_code(struct tile_config *amx_cfg, /* xfd=0x40000, disable amx tiledata */ wrmsr(MSR_IA32_XFD, XFEATURE_MASK_XTILEDATA); + + /* + * XTILEDATA is cleared in xstate_bv but set in xcomp_bv, this property + * remains the same even when amx tiledata is disabled by IA32_XFD. + */ + xstate->header.xstate_bv = XFEATURE_MASK_XTILEDATA; + __xsavec(xstate, XFEATURE_MASK_XTILEDATA); + GUEST_ASSERT(!(xstate->header.xstate_bv & XFEATURE_MASK_XTILEDATA)); + GUEST_ASSERT((xstate->header.xcomp_bv & XFEATURE_MASK_XTILEDATA)); + GUEST_SYNC(6); GUEST_ASSERT(rdmsr(MSR_IA32_XFD) == XFEATURE_MASK_XTILEDATA); set_tilecfg(amx_cfg); |