linux-kernel - [PATCH 0/3] xen: use X86_FEATURE

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Message-ID: <20250826145608.10352-1-jgross@suse.com>
Date: Tue, 26 Aug 2025 16:56:05 +0200
From: Juergen Gross <jgross@...e.com>
To: linux-kernel@...r.kernel.org,
	x86@...nel.org
Cc: Juergen Gross <jgross@...e.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Stefano Stabellini <sstabellini@...nel.org>,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
	xen-devel@...ts.xenproject.org
Subject: [PATCH 0/3] xen: use X86_FEATURE_XENPV for PV specific code

Instead of using a global variable with the current guest type or the
XENFEAT_auto_translated_physmap Xen feature, use the already existing
X86_FEATURE_XENPV for guarding PV mode specific code.

This has the advantage of compile time code elimination in case of the
kernel having been configured without CONFIG_XEN_PV, and the usage of
static-keys for selecting the correct code path otherwise.

Juergen Gross (3):
  xen: rework xen_pv_domain()
  xen: replace XENFEAT_auto_translated_physmap with xen_pv_domain()
  drivers/xen/gntdev: use xen_pv_domain() instead of cached value

 arch/x86/include/asm/xen/page.h    | 14 ++++++-------
 arch/x86/xen/enlighten_pv.c        |  2 +-
 arch/x86/xen/mmu.c                 |  2 +-
 arch/x86/xen/p2m.c                 |  4 ++--
 drivers/xen/balloon.c              |  4 ++--
 drivers/xen/gntdev-dmabuf.c        |  7 +++----
 drivers/xen/gntdev-dmabuf.h        |  2 +-
 drivers/xen/gntdev.c               | 33 +++++++++++++-----------------
 drivers/xen/grant-table.c          |  6 +++---
 drivers/xen/privcmd.c              | 14 ++++++-------
 drivers/xen/unpopulated-alloc.c    |  4 ++--
 drivers/xen/xenbus/xenbus_client.c |  2 +-
 include/xen/grant_table.h          |  4 ++--
 include/xen/mem-reservation.h      |  4 ++--
 include/xen/xen-ops.h              |  7 ++++---
 include/xen/xen.h                  |  9 +++++++-
 16 files changed, 59 insertions(+), 59 deletions(-)

-- 
2.43.0