linux-kernel - Re: [PATCH v12 05/23] KVM: selftests: Update kvm_init_vm_address

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Message-ID: <aaceb122-c64a-487c-9836-4436d7cf2607@intel.com>
Date: Thu, 30 Oct 2025 20:53:49 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Sagi Shahar <sagis@...gle.com>, <linux-kselftest@...r.kernel.org>, "Paolo
 Bonzini" <pbonzini@...hat.com>, Shuah Khan <shuah@...nel.org>, "Sean
 Christopherson" <seanjc@...gle.com>, Ackerley Tng <ackerleytng@...gle.com>,
	Ryan Afranji <afranji@...gle.com>, Andrew Jones <ajones@...tanamicro.com>,
	Isaku Yamahata <isaku.yamahata@...el.com>, Erdem Aktas
	<erdemaktas@...gle.com>, Rick Edgecombe <rick.p.edgecombe@...el.com>, "Roger
 Wang" <runanwang@...gle.com>, Binbin Wu <binbin.wu@...ux.intel.com>, "Oliver
 Upton" <oliver.upton@...ux.dev>, "Pratik R. Sampat"
	<pratikrajesh.sampat@....com>, Ira Weiny <ira.weiny@...el.com>, Chao Gao
	<chao.gao@...el.com>, Chenyi Qiang <chenyi.qiang@...el.com>
CC: <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>, Adrian Hunter
	<adrian.hunter@...el.com>
Subject: Re: [PATCH v12 05/23] KVM: selftests: Update
 kvm_init_vm_address_properties() for TDX

Hi Sagi,

On 10/28/25 2:20 PM, Sagi Shahar wrote:
> From: Isaku Yamahata <isaku.yamahata@...el.com>
> 
> Let kvm_init_vm_address_properties() initialize vm->arch.{s_bit, tag_mask}
> similar to SEV.

To me this seems like a verbatim description of what can be seen from the
patch self. How about something like:
	Initialize which GPA bit a TDX VM uses to tag shared memory in guest page
	tables.

> 
> TDX sets the shared bit based on the guest physical address width and
> currently supports 48 and 52 widths.
> 

...

> diff --git a/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h b/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h
> new file mode 100644
> index 000000000000..286d5e3c24b1
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +#ifndef SELFTESTS_TDX_TDX_UTIL_H
> +#define SELFTESTS_TDX_TDX_UTIL_H
> +
> +#include <stdbool.h>
> +
> +#include "kvm_util.h"
> +
> +static inline bool is_tdx_vm(struct kvm_vm *vm)
> +{
> +	return vm->type == KVM_X86_TDX_VM;
> +}
> +
> +#endif // SELFTESTS_TDX_TDX_UTIL_H

I recommend this work sticks to using /* ... */ for single line comments.
For reference you can compare the custom of all the other header files in this
area.

Reinette