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target/i386: fix xsave.flat from kvm-unit-tests

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xsave.flat checks that "executing the XSETBV instruction causes a general-
protection fault (#GP) if ECX = 0 and EAX[2:1] has the value 10b".  QEMU allows
that option, so the test fails.  Add the condition.

Cc: qemu-stable@nongnu.org
Fixes: 892544317f ("target/i386: implement XSAVE and XRSTOR of AVX registers", 2022-10-18)
Reported-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 7604bbc2d8)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Paolo Bonzini 2024-06-03 12:01:12 +02:00 • committed by Michael Tokarev
parent 2891807479
commit d84afebcee
1 changed files with 5 additions and 0 deletions
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5
target/i386/tcg/fpu_helper.c
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@ -3012,6 +3012,11 @@ void helper_xsetbv(CPUX86State *env, uint32_t ecx, uint64_t mask)
goto do_gpf;
}
/* SSE can be disabled, but only if AVX is disabled too. */
if ((mask & (XSTATE_SSE_MASK | XSTATE_YMM_MASK)) == XSTATE_YMM_MASK) {
goto do_gpf;
}
/* Disallow enabling unimplemented features. */
cpu_x86_cpuid(env, 0x0d, 0, &ena_lo, &dummy, &dummy, &ena_hi);
ena = ((uint64_t)ena_hi << 32) | ena_lo;