Re: [RESEND PATCH v2] target/i386: Switch back XFRM value

[Yang Zhong]

On Mon, Mar 27, 2023 at 04:03:54PM +0800, Yang, Weijiang wrote:
> 
> On 3/27/2023 3:33 PM, Christian Ehrhardt wrote:
> > On Thu, Oct 27, 2022 at 2:36 AM Yang, Weijiang <weijiang.yang@intel.com> 
> > wrote:
> > > 
> > > On 10/26/2022 7:57 PM, Zhong, Yang wrote:
> > > > The previous patch wrongly replaced FEAT_XSAVE_XCR0_{LO|HI} with
> > > > FEAT_XSAVE_XSS_{LO|HI} in CPUID(EAX=12,ECX=1):{ECX,EDX}, which made
> > > > SGX enclave only supported SSE and x87 feature(xfrm=0x3).
> > > > 
> > > > Fixes: 301e90675c3f ("target/i386: Enable support for XSAVES based 
> > > > features")
> > > > 
> > > > Signed-off-by: Yang Zhong <yang.zhong@linux.intel.com>
> > > > ---
> > > >    target/i386/cpu.c | 4 ++--
> > > >    1 file changed, 2 insertions(+), 2 deletions(-)
> > > > 
> > > > diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> > > > index ad623d91e4..19aaed877b 100644
> > > > --- a/target/i386/cpu.c
> > > > +++ b/target/i386/cpu.c
> > > > @@ -5584,8 +5584,8 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t 
> > > > index, uint32_t count,
> > > >            } else {
> > > >                *eax &= env->features[FEAT_SGX_12_1_EAX];
> > > >                *ebx &= 0; /* ebx reserve */
> > > > -            *ecx &= env->features[FEAT_XSAVE_XSS_LO];
> > > > -            *edx &= env->features[FEAT_XSAVE_XSS_HI];
> > > > +            *ecx &= env->features[FEAT_XSAVE_XCR0_LO];
> > > > +            *edx &= env->features[FEAT_XSAVE_XCR0_HI];
> > > Oops, that's my fault to replace with wrong definitions, thanks for the 
> > > fix!
> > > 
> > > Reviewed-by:  Yang Weijiang <weijiang.yang@intel.com>
> > Hi,
> > I do not have any background on this but stumbled over this and wondered,
> > is there any particular reason why this wasn't applied yet?
> > 
> > It seemed to fix a former mistake, was acked and then ... silence
> 
> Chris, thanks for the catch!
> 
> I double checked this patch isn't in the latest 8.0.0-rc1 tree.
> 
> 
> Hi, Paolo,
> 
> Could you help merge this fixup patch? Thanks!


  Hello all,

  Let me rebase this patch and resend it, thanks!

  Yang


> 
> > 
> > > >                /* FP and SSE are always allowed regardless of 
> > > > XSAVE/XCR0. */
> > > >                *ecx |= XSTATE_FP_MASK | XSTATE_SSE_MASK;
> >