renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2025-01-10 06:34:17 +08:00
Code
Mainline Linux tree for various devices, only for fun :)
719,127 Commits 41 Branches 2 Tags 3.4 GiB
C 97.6%
Assembly 1%
Shell 0.5%
Makefile 0.3%
Python 0.3%
5af4157388
Go to file
Wanpeng Li 5af4157388 KVM: nVMX: Fix mmu context after VMLAUNCH/VMRESUME failure 
Commit 4f350c6dbc (kvm: nVMX: Handle deferred early VMLAUNCH/VMRESUME failure
properly) can result in L1(run kvm-unit-tests/run_tests.sh vmx_controls in L1)
null pointer deference and also L0 calltrace when EPT=0 on both L0 and L1.

In L1:

BUG: unable to handle kernel paging request at ffffffffc015bf8f
 IP: vmx_vcpu_run+0x202/0x510 [kvm_intel]
 PGD 146e13067 P4D 146e13067 PUD 146e15067 PMD 3d2686067 PTE 3d4af9161
 Oops: 0003 [#1] PREEMPT SMP
 CPU: 2 PID: 1798 Comm: qemu-system-x86 Not tainted 4.14.0-rc4+ #6
 RIP: 0010:vmx_vcpu_run+0x202/0x510 [kvm_intel]
 Call Trace:
 WARNING: kernel stack frame pointer at ffffb86f4988bc18 in qemu-system-x86:1798 has bad value 0000000000000002

In L0:

-----------[ cut here ]------------
 WARNING: CPU: 6 PID: 4460 at /home/kernel/linux/arch/x86/kvm//vmx.c:9845 vmx_inject_page_fault_nested+0x130/0x140 [kvm_intel]
 CPU: 6 PID: 4460 Comm: qemu-system-x86 Tainted: G           OE   4.14.0-rc7+ #25
 RIP: 0010:vmx_inject_page_fault_nested+0x130/0x140 [kvm_intel]
 Call Trace:
  paging64_page_fault+0x500/0xde0 [kvm]
  ? paging32_gva_to_gpa_nested+0x120/0x120 [kvm]
  ? nonpaging_page_fault+0x3b0/0x3b0 [kvm]
  ? __asan_storeN+0x12/0x20
  ? paging64_gva_to_gpa+0xb0/0x120 [kvm]
  ? paging64_walk_addr_generic+0x11a0/0x11a0 [kvm]
  ? lock_acquire+0x2c0/0x2c0
  ? vmx_read_guest_seg_ar+0x97/0x100 [kvm_intel]
  ? vmx_get_segment+0x2a6/0x310 [kvm_intel]
  ? sched_clock+0x1f/0x30
  ? check_chain_key+0x137/0x1e0
  ? __lock_acquire+0x83c/0x2420
  ? kvm_multiple_exception+0xf2/0x220 [kvm]
  ? debug_check_no_locks_freed+0x240/0x240
  ? debug_smp_processor_id+0x17/0x20
  ? __lock_is_held+0x9e/0x100
  kvm_mmu_page_fault+0x90/0x180 [kvm]
  kvm_handle_page_fault+0x15c/0x310 [kvm]
  ? __lock_is_held+0x9e/0x100
  handle_exception+0x3c7/0x4d0 [kvm_intel]
  vmx_handle_exit+0x103/0x1010 [kvm_intel]
  ? kvm_arch_vcpu_ioctl_run+0x1628/0x2e20 [kvm]

The commit avoids to load host state of vmcs12 as vmcs01's guest state
since vmcs12 is not modified (except for the VM-instruction error field)
if the checking of vmcs control area fails. However, the mmu context is
switched to nested mmu in prepare_vmcs02() and it will not be reloaded
since load_vmcs12_host_state() is skipped when nested VMLAUNCH/VMRESUME
fails. This patch fixes it by reloading mmu context when nested
VMLAUNCH/VMRESUME fails.

Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Jim Mattson <jmattson@google.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2017-11-17 13:20:14 +01:00
arch KVM: nVMX: Fix mmu context after VMLAUNCH/VMRESUME failure 2017-11-17 13:20:14 +01:00
block block/blk-mq.c: use kmalloc_array_node() 2017-11-15 18:21:02 -08:00
certs License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
crypto kmemcheck: stop using GFP_NOTRACK and SLAB_NOTRACK 2017-11-15 18:21:04 -08:00
Documentation GICv4 Support for KVM/ARM for v4.15 2017-11-17 13:20:01 +01:00
drivers ARM: SoC driver updates for v4.15 2017-11-16 16:05:01 -08:00
firmware License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fs Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2017-11-16 12:50:35 -08:00
include GICv4 Support for KVM/ARM for v4.15 2017-11-17 13:20:01 +01:00
init Merge branch 'akpm' (patches from Andrew) 2017-11-15 19:42:40 -08:00
ipc License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
kernel Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2017-11-16 12:20:15 -08:00
lib Driver core patches for 4.15-rc1 2017-11-16 08:55:30 -08:00
mm virtio, vhost, qemu: bugfixes, cleanups 2017-11-16 13:14:46 -08:00
net Merge branch 'akpm' (patches from Andrew) 2017-11-15 19:42:40 -08:00
samples media updates for v4.15-rc1 2017-11-15 20:30:12 -08:00
scripts main drm pull request for v4.15 2017-11-15 20:42:10 -08:00
security Modules updates for v4.15 2017-11-15 13:46:33 -08:00
sound sound updates for 4.15-rc1 2017-11-14 18:01:46 -08:00
tools First batch of KVM changes for 4.15 2017-11-16 13:00:24 -08:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt GICv4 Support for KVM/ARM for v4.15 2017-11-17 13:20:01 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore .gitignore: move *.dtb and *.dtb.S patterns to the top-level .gitignore 2017-11-08 11:20:24 -06:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS ARM: SoC driver updates for v4.15 2017-11-16 16:05:01 -08:00
Makefile RISC-V Port for Linux 4.15 v9 2017-11-15 10:49:15 -08:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.