[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20200203151608.28053-1-xiaoyao.li@intel.com>
Date: Mon, 3 Feb 2020 23:16:02 +0800
From: Xiaoyao Li <xiaoyao.li@...el.com>
To: Paolo Bonzini <pbonzini@...hat.com>,
Sean Christopherson <sean.j.christopherson@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Andy Lutomirski <luto@...capital.net>
Cc: x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
David Laight <David.Laight@...lab.com>,
Xiaoyao Li <xiaoyao.li@...el.com>
Subject: [PATCH v2 0/6] kvm/split_lock: Add feature split lock detection support in kvm
This version adds the virtualization of split lock detection for guest
in patch 5 and patch 6.
No matter whether we advertise split lock detection to guest, we have to make
a choice between not burn the old guest and prevent DoS attack from guest since
we cannot identify whether a guest is malicious.
Since sld_warn mode also allows userspace applications to do split lock
we can extend the similar policy to guest that if host is sld_warn, we allow
guest to generate split lock by clearing MSR_TEST_CTRL.SPLIT_LOCK_DETECT bit
when vcpu is running.
If host is sld_fatal mode and guest doesn't set its SPLIT_LOCK_DETECT bit we
forward split lock #AC to user space, similar as sending SIGBUS.
Xiaoyao Li (6):
x86/split_lock: Add and export get_split_lock_detect_state()
x86/split_lock: Add and export split_lock_detect_set()
kvm: x86: Emulate split-lock access as a write
kvm: vmx: Extend VMX's #AC handding for split lock in guest
kvm: x86: Emulate MSR IA32_CORE_CAPABILITIES
x86: vmx: virtualize split lock detection
arch/x86/include/asm/cpu.h | 13 +++++
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kernel/cpu/intel.c | 18 ++++--
arch/x86/kvm/cpuid.c | 5 +-
arch/x86/kvm/vmx/vmx.c | 98 ++++++++++++++++++++++++++++++++-
arch/x86/kvm/vmx/vmx.h | 4 ++
arch/x86/kvm/x86.c | 44 ++++++++++++++-
7 files changed, 171 insertions(+), 12 deletions(-)
--
2.23.0
Powered by blists - more mailing lists