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KVM: selftests: Fix an error in comment of amx_test

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After the execution of __tilerelease(), AMX component will be in INIT
state. Therefore, execution of XSAVEC saving the AMX state into memory will
cause the xstate_bv[18] cleared in xheader. However, the xcomp_bv[18] will
remain set. Fix the error in comment. Also, update xsavec() to XSAVEC
because xcomp_bv[18] is set due to the instruction, not the function.
Finally, use XTILEDATA instead 'bit 18' in comments.

Cc: Jim Mattson <jmattson@google.com>
Cc: Venkatesh Srinivas <venkateshs@google.com>
Cc: Aaron Lewis <aaronlewis@google.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
Link: https://lore.kernel.org/r/20230221163655.920289-4-mizhang@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Mingwei Zhang 2023-02-21 16:36:45 +00:00 committed by Sean Christopherson
parent 5de4a3765b
commit bec357a4af
1 changed files with 4 additions and 1 deletions
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5
tools/testing/selftests/kvm/x86_64/amx_test.c
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@ -190,7 +190,10 @@ static void __attribute__((__flatten__)) guest_code(struct tile_config *amx_cfg,
GUEST_SYNC(4);
__tilerelease();
GUEST_SYNC(5);
/* bit 18 not in the XCOMP_BV after xsavec() */
/*
* After XSAVEC, XTILEDATA is cleared in the xstate_bv but is set in
* the xcomp_bv.
*/
xstate->header.xstate_bv = XFEATURE_MASK_XTILEDATA;
__xsavec(xstate, XFEATURE_MASK_XTILEDATA);
GUEST_ASSERT(!(xstate->header.xstate_bv & XFEATURE_MASK_XTILEDATA));