| Message ID | 20240603100405.619418-1-pbonzini@redhat.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | target/i386: fix xsave.flat from kvm-unit-tests | expand |
On 03/06/2024 12.04, Paolo Bonzini wrote: > 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: 892544317fe ("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> > --- > target/i386/tcg/fpu_helper.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/target/i386/tcg/fpu_helper.c b/target/i386/tcg/fpu_helper.c > index e322293371c..e1b850f3fc2 100644 > --- a/target/i386/tcg/fpu_helper.c > +++ b/target/i386/tcg/fpu_helper.c > @@ -3142,6 +3142,11 @@ 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; > + } That fixes the kvm-unit-test, indeed! Thanks! Tested-by: Thomas Huth <thuth@redhat.com>
diff --git a/target/i386/tcg/fpu_helper.c b/target/i386/tcg/fpu_helper.c index e322293371c..e1b850f3fc2 100644 --- a/target/i386/tcg/fpu_helper.c +++ b/target/i386/tcg/fpu_helper.c @@ -3142,6 +3142,11 @@ 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;
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: 892544317fe ("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> --- target/i386/tcg/fpu_helper.c | 5 +++++ 1 file changed, 5 insertions(+)