From: Juergen Gross <jgross@suse.com> To: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, x86@kernel.org, linux-s390@vger.kernel.org, linux-hyperv@vger.kernel.org, virtualization@lists.linux-foundation.org Cc: Juergen Gross <jgross@suse.com>, Arnd Bergmann <arnd@arndb.de>, Heiko Carstens <hca@linux.ibm.com>, Vasily Gorbik <gor@linux.ibm.com>, Alexander Gordeev <agordeev@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, Sven Schnelle <svens@linux.ibm.com>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>, "H. Peter Anvin" <hpa@zytor.com>, "K. Y. Srinivasan" <kys@microsoft.com>, Haiyang Zhang <haiyangz@microsoft.com>, Stephen Hemminger <sthemmin@microsoft.com>, Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>, Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org>, "Michael S. Tsirkin" <mst@redhat.com>, Jason Wang <jasowang@redhat.com>, Christoph Hellwig <hch@infradead.org>, Oleksandr Tyshchenko <olekstysh@gmail.com> Subject: [PATCH 0/2] kernel: add new infrastructure for platform_has() support Date: Tue, 26 Apr 2022 15:40:19 +0200 [thread overview] Message-ID: <20220426134021.11210-1-jgross@suse.com> (raw) In another patch series [1] the need has come up to have support for a generic feature flag infrastructure. This patch series is introducing that infrastructure and adds the first use case. I have decided to use a similar interface as the already known x86 cpu_has() function. As the new infrastructure is meant to be usable for general and arch-specific feature flags, the flags are being spread between a general bitmap and an arch specific one. The bitmaps start all being zero, single features can be set or reset at any time by using the related platform_[re]set_feature() functions. The platform_has() function is using a simple test_bit() call for now, further optimization might be added when needed. [1]: https://lore.kernel.org/lkml/1650646263-22047-1-git-send-email-olekstysh@gmail.com/T/#t Juergen Gross (2): kernel: add platform_has() infrastructure virtio: replace arch_has_restricted_virtio_memory_access() MAINTAINERS | 8 +++++++ arch/s390/Kconfig | 1 - arch/s390/mm/init.c | 13 +++-------- arch/x86/Kconfig | 1 - arch/x86/kernel/cpu/mshyperv.c | 5 ++++- arch/x86/mm/mem_encrypt.c | 6 ------ arch/x86/mm/mem_encrypt_identity.c | 5 +++++ drivers/virtio/Kconfig | 6 ------ drivers/virtio/virtio.c | 5 ++--- include/asm-generic/Kbuild | 1 + include/asm-generic/platform-feature.h | 8 +++++++ include/linux/platform-feature.h | 30 ++++++++++++++++++++++++++ include/linux/virtio_config.h | 9 -------- kernel/Makefile | 2 +- kernel/platform-feature.c | 7 ++++++ 15 files changed, 69 insertions(+), 38 deletions(-) create mode 100644 include/asm-generic/platform-feature.h create mode 100644 include/linux/platform-feature.h create mode 100644 kernel/platform-feature.c -- 2.34.1
WARNING: multiple messages have this Message-ID (diff)
From: Juergen Gross via Virtualization <virtualization@lists.linux-foundation.org> To: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, x86@kernel.org, linux-s390@vger.kernel.org, linux-hyperv@vger.kernel.org, virtualization@lists.linux-foundation.org Cc: "Michael S. Tsirkin" <mst@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Dave Hansen <dave.hansen@linux.intel.com>, "H. Peter Anvin" <hpa@zytor.com>, Alexander Gordeev <agordeev@linux.ibm.com>, Wei Liu <wei.liu@kernel.org>, Stephen Hemminger <sthemmin@microsoft.com>, Vasily Gorbik <gor@linux.ibm.com>, Dexuan Cui <decui@microsoft.com>, Christoph Hellwig <hch@infradead.org>, Ingo Molnar <mingo@redhat.com>, Haiyang Zhang <haiyangz@microsoft.com>, Arnd Bergmann <arnd@arndb.de>, Heiko Carstens <hca@linux.ibm.com>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, Juergen Gross <jgross@suse.com>, Oleksandr Tyshchenko <olekstysh@gmail.com>, Sven Schnelle <svens@linux.ibm.com> Subject: [PATCH 0/2] kernel: add new infrastructure for platform_has() support Date: Tue, 26 Apr 2022 15:40:19 +0200 [thread overview] Message-ID: <20220426134021.11210-1-jgross@suse.com> (raw) In another patch series [1] the need has come up to have support for a generic feature flag infrastructure. This patch series is introducing that infrastructure and adds the first use case. I have decided to use a similar interface as the already known x86 cpu_has() function. As the new infrastructure is meant to be usable for general and arch-specific feature flags, the flags are being spread between a general bitmap and an arch specific one. The bitmaps start all being zero, single features can be set or reset at any time by using the related platform_[re]set_feature() functions. The platform_has() function is using a simple test_bit() call for now, further optimization might be added when needed. [1]: https://lore.kernel.org/lkml/1650646263-22047-1-git-send-email-olekstysh@gmail.com/T/#t Juergen Gross (2): kernel: add platform_has() infrastructure virtio: replace arch_has_restricted_virtio_memory_access() MAINTAINERS | 8 +++++++ arch/s390/Kconfig | 1 - arch/s390/mm/init.c | 13 +++-------- arch/x86/Kconfig | 1 - arch/x86/kernel/cpu/mshyperv.c | 5 ++++- arch/x86/mm/mem_encrypt.c | 6 ------ arch/x86/mm/mem_encrypt_identity.c | 5 +++++ drivers/virtio/Kconfig | 6 ------ drivers/virtio/virtio.c | 5 ++--- include/asm-generic/Kbuild | 1 + include/asm-generic/platform-feature.h | 8 +++++++ include/linux/platform-feature.h | 30 ++++++++++++++++++++++++++ include/linux/virtio_config.h | 9 -------- kernel/Makefile | 2 +- kernel/platform-feature.c | 7 ++++++ 15 files changed, 69 insertions(+), 38 deletions(-) create mode 100644 include/asm-generic/platform-feature.h create mode 100644 include/linux/platform-feature.h create mode 100644 kernel/platform-feature.c -- 2.34.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next reply other threads:[~2022-04-26 13:40 UTC|newest] Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-04-26 13:40 Juergen Gross [this message] 2022-04-26 13:40 ` [PATCH 0/2] kernel: add new infrastructure for platform_has() support Juergen Gross via Virtualization 2022-04-26 13:40 ` [PATCH 1/2] kernel: add platform_has() infrastructure Juergen Gross 2022-04-26 13:40 ` Juergen Gross via Virtualization 2022-04-26 17:31 ` Borislav Petkov 2022-04-26 17:31 ` Borislav Petkov 2022-04-26 19:53 ` Heiko Carstens 2022-04-26 20:09 ` Borislav Petkov 2022-04-26 20:09 ` Borislav Petkov 2022-04-27 6:20 ` Juergen Gross 2022-04-27 6:20 ` Juergen Gross via Virtualization 2022-04-26 13:40 ` [PATCH 2/2] virtio: replace arch_has_restricted_virtio_memory_access() Juergen Gross 2022-04-26 13:40 ` Juergen Gross via Virtualization 2022-04-26 17:35 ` Borislav Petkov 2022-04-26 17:35 ` Borislav Petkov 2022-04-26 19:51 ` Heiko Carstens 2022-04-27 6:40 ` Juergen Gross 2022-04-27 6:40 ` Juergen Gross via Virtualization 2022-04-27 12:26 ` Borislav Petkov 2022-04-27 12:26 ` Borislav Petkov 2022-04-27 12:45 ` Juergen Gross 2022-04-27 12:45 ` Juergen Gross via Virtualization 2022-04-27 6:37 ` Juergen Gross 2022-04-27 6:37 ` Juergen Gross via Virtualization 2022-04-27 12:28 ` Borislav Petkov 2022-04-27 12:28 ` Borislav Petkov 2022-04-27 12:37 ` Juergen Gross 2022-04-27 12:37 ` Juergen Gross via Virtualization 2022-04-27 14:09 ` Tom Lendacky 2022-04-27 14:09 ` Tom Lendacky via Virtualization 2022-04-27 14:14 ` Juergen Gross 2022-04-27 14:14 ` Juergen Gross via Virtualization 2022-04-27 7:48 ` [PATCH 0/2] kernel: add new infrastructure for platform_has() support Oleksandr
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