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Sun, 25 Feb 2024 10:53:21 +0000 (UTC) Date: Sun, 25 Feb 2024 11:53:20 +0100 From: Borislav Petkov To: Linus Torvalds Cc: x86-ml , lkml Subject: [GIT PULL] x86/urgent for v6.8-rc6 Message-ID: <20240225105320.GAZdscIJ3wxkU8_6At@fat_crate.local> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1791867931699015137 X-GMAIL-MSGID: 1791867931699015137 Hi Linus, please pull a bunch of urgent x86 fixes for v6.8-rc6. Thx. --- The following changes since commit b401b621758e46812da61fa58a67c3fd8d91de0d: Linux 6.8-rc5 (2024-02-18 12:56:25 -0800) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tags/x86_urgent_for_v6.8_rc6 for you to fetch changes up to 43fb862de8f628c5db5e96831c915b9aebf62d33: KVM/VMX: Move VERW closer to VMentry for MDS mitigation (2024-02-19 16:31:59 -0800) ---------------------------------------------------------------- - Make sure clearing CPU buffers using VERW happens at the latest possible point in the return-to-userspace path, otherwise memory accesses after the VERW execution could cause data to land in CPU buffers again ---------------------------------------------------------------- Pawan Gupta (5): x86/bugs: Add asm helpers for executing VERW x86/entry_64: Add VERW just before userspace transition x86/entry_32: Add VERW just before userspace transition x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key KVM/VMX: Move VERW closer to VMentry for MDS mitigation Sean Christopherson (1): KVM/VMX: Use BT+JNC, i.e. EFLAGS.CF to select VMRESUME vs. VMLAUNCH Documentation/arch/x86/mds.rst | 38 +++++++++++++++++++++++++----------- arch/x86/entry/entry.S | 23 ++++++++++++++++++++++ arch/x86/entry/entry_32.S | 3 +++ arch/x86/entry/entry_64.S | 11 +++++++++++ arch/x86/entry/entry_64_compat.S | 1 + arch/x86/include/asm/cpufeatures.h | 2 +- arch/x86/include/asm/entry-common.h | 1 - arch/x86/include/asm/nospec-branch.h | 25 ++++++++++++------------ arch/x86/kernel/cpu/bugs.c | 15 ++++++-------- arch/x86/kernel/nmi.c | 3 --- arch/x86/kvm/vmx/run_flags.h | 7 +++++-- arch/x86/kvm/vmx/vmenter.S | 9 ++++++--- arch/x86/kvm/vmx/vmx.c | 20 +++++++++++++++---- 13 files changed, 112 insertions(+), 46 deletions(-)