linux-kernel - [PATCH V3 0/2] x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250722131533.106473-1-adrian.hunter@intel.com>
Date: Tue, 22 Jul 2025 16:15:31 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Dave Hansen <dave.hansen@...ux.intel.com>,
	pbonzini@...hat.com,
	seanjc@...gle.com,
	vannapurve@...gle.com
Cc: Tony Luck <tony.luck@...el.com>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	x86@...nel.org,
	H Peter Anvin <hpa@...or.com>,
	linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	rick.p.edgecombe@...el.com,
	kas@...nel.org,
	kai.huang@...el.com,
	reinette.chatre@...el.com,
	xiaoyao.li@...el.com,
	tony.lindgren@...ux.intel.com,
	binbin.wu@...ux.intel.com,
	isaku.yamahata@...el.com,
	yan.y.zhao@...el.com,
	chao.gao@...el.com
Subject: [PATCH V3 0/2] x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present

Hi

Here are 2 small self-explanatory patches related to clearing TDX private
pages.

Patch 1 is a minor tidy-up.

In patch 2, by skipping the clearing step, shutdown time can improve by
up to 40%.


Changes in V3:

      x86/tdx: Eliminate duplicate code in tdx_clear_page()
	Explain "quirk" rename in commit message (Rick)
	Explain mb() change in commit message  (Rick)
	Add Rev'd-by, Ack'd-by tags

      x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present
	Remove "flush cache" comments (Rick)
	Update function comment to better relate to "quirk" naming (Rick)
	Add "via MOVDIR64B" to comment (Xiaoyao)
	Add Rev'd-by, Ack'd-by tags

Changes in V2 (as requested by Dave):

      x86/tdx: Eliminate duplicate code in tdx_clear_page()
	Rename reset_tdx_pages() to tdx_quirk_reset_paddr()
	Call tdx_quirk_reset_paddr() directly

      x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present
	Improve the comment


Adrian Hunter (2):
      x86/tdx: Eliminate duplicate code in tdx_clear_page()
      x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present

 arch/x86/include/asm/tdx.h  |  2 ++
 arch/x86/kvm/vmx/tdx.c      | 25 +++----------------------
 arch/x86/virt/vmx/tdx/tdx.c | 15 ++++++++++-----
 3 files changed, 15 insertions(+), 27 deletions(-)


Regards
Adrian