linux-kernel - RE: [PATCH v3 7/8] KVM:X86: Add XSS bit 11 and 12 support for CET xsaves/xrstors.

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Date:   Mon, 11 Mar 2019 01:29:15 +0000
From:   "Kang, Luwei" <luwei.kang@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        "Yang, Weijiang" <weijiang.yang@...el.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "mst@...hat.com" <mst@...hat.com>,
        "Yu, Yu-cheng" <yu-cheng.yu@...el.com>
CC:     Zhang Yi Z <yi.z.zhang@...ux.intel.com>
Subject: RE: [PATCH v3 7/8] KVM:X86: Add XSS bit 11 and 12 support for CET
 xsaves/xrstors.

> > For Guest XSS, right now, only bit 11(user states) and bit 12
> > (supervisor states) are supported, if other bits are being set, need
> > to modify KVM_SUPPORTED_XSS macro to have support.
> >
> > Signed-off-by: Zhang Yi Z <yi.z.zhang@...ux.intel.com>
> > Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
> > ---
> >  arch/x86/kvm/vmx.c | 8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index
> > d32cee9ee079..68908ed7b151 100644
> > --- a/arch/x86/kvm/vmx.c
> > +++ b/arch/x86/kvm/vmx.c
> > @@ -47,6 +47,7 @@
> >  #include <asm/virtext.h>
> >  #include <asm/mce.h>
> >  #include <asm/fpu/internal.h>
> > +#include <asm/fpu/types.h>
> >  #include <asm/perf_event.h>
> >  #include <asm/debugreg.h>
> >  #include <asm/kexec.h>
> > @@ -4336,12 +4337,13 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> >  	case MSR_IA32_XSS:
> >  		if (!vmx_xsaves_supported())
> >  			return 1;
> > +
> >  		/*
> > -		 * The only supported bit as of Skylake is bit 8, but
> > -		 * it is not supported on KVM.
> > +		 * Check bits being set are supported in KVM.
> >  		 */
> > -		if (data != 0)
> > +		if (data & ~kvm_supported_xss())
> >  			return 1;
> > +
> >  		vcpu->arch.ia32_xss = data;
> >  		if (vcpu->arch.ia32_xss != host_xss)
> >  			add_atomic_switch_msr(vmx, MSR_IA32_XSS,
> >
> 
> Luwei, can you work with Weijiang to add XSAVES support for Processor Tracing?

Hi Paolo,
    As we talk long time before. I will do that.

Thanks,
Luwei Kang

> 
> Paolo