linux-kernel - RE: [PATCH 5/6] x86/hyperv: Support hypercalls for TDX guests

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Date:   Wed, 23 Nov 2022 02:14:58 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "arnd@...db.de" <arnd@...db.de>, "bp@...en8.de" <bp@...en8.de>,
        "brijesh.singh@....com" <brijesh.singh@....com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "jane.chu@...cle.com" <jane.chu@...cle.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "luto@...nel.org" <luto@...nel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "x86@...nel.org" <x86@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 5/6] x86/hyperv: Support hypercalls for TDX guests

> From: Dave Hansen <dave.hansen@...el.com>
> Sent: Monday, November 21, 2022 12:05 PM
> [...]
> >  #ifdef CONFIG_X86_64
> > +#if CONFIG_INTEL_TDX_GUEST
> > +	if (hv_isolation_type_tdx()) {
> 
> >  #ifdef CONFIG_X86_64
> > +#if CONFIG_INTEL_TDX_GUEST
> > +	if (hv_isolation_type_tdx())
> 
> >  #ifdef CONFIG_X86_64
> > +#if CONFIG_INTEL_TDX_GUEST
> > +	if (hv_isolation_type_tdx())
> > +		return __tdx_ms_hv_hypercall(control, input2, input1);
> 
> See any common patterns there?
> 
> The "no #ifdef's in C files" rule would be good to apply here.  Please
> do one #ifdef in a header.

Sorry, I should use #ifdef rather than #if. I'll fix it like the below.

I don't think I can do one #ifdef, because, in the header file, there are
already 3 existing instances of 
#ifdef CONFIG_X86_64
#else
#endif
and I'm just adding a new block "#ifdef CONFIG_INTEL_TDX_GUEST ... #endif"
to the CONFIG_X86_64 case. FWIW, CONFIG_INTEL_TDX_GUEST already
depends on CONFIG_X86_64.

--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -48,7 +48,7 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
        u64 hv_status;

 #ifdef CONFIG_X86_64
-#if CONFIG_INTEL_TDX_GUEST
+#ifdef CONFIG_INTEL_TDX_GUEST
        if (hv_isolation_type_tdx()) {
                if (input_address)
                        input_address += ms_hyperv.shared_gpa_boundary;
@@ -97,7 +97,7 @@ static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
        u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;

 #ifdef CONFIG_X86_64
-#if CONFIG_INTEL_TDX_GUEST
+#ifdef CONFIG_INTEL_TDX_GUEST
        if (hv_isolation_type_tdx())
                return __tdx_ms_hv_hypercall(control, 0, input1);
 #endif
@@ -133,7 +133,7 @@ static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
        u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;

 #ifdef CONFIG_X86_64
-#if CONFIG_INTEL_TDX_GUEST
+#ifdef CONFIG_INTEL_TDX_GUEST
        if (hv_isolation_type_tdx())
                return __tdx_ms_hv_hypercall(control, input2, input1);
 #endif