Re: [PATCH v2 6/9] KVM: arm64: Detect and handle hypervisor stack overflows

kernel test robot
2022-02-23T09:06:31Z

Hi Kalesh,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on cfb92440ee71adcc2105b0890bb01ac3cddb8507]

url: https://github.com/0day-ci/linux/commits/Kalesh-Singh/KVM-arm64-Hypervisor-stack-enhancements/20220223-010522
base: cfb92440ee71adcc2105b0890bb01ac3cddb8507
config: arm64-randconfig-r011-20220221 (https://download.01.org/0day-ci/archive/20220223/202202231727.L621fVgD-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm64 cross compiling tool for clang build
# apt-get install binutils-aarch64-linux-gnu
# https://github.com/0day-ci/linux/commit/7fe99fd40f7c4b2973218045ca5b9c9160524db1
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Kalesh-Singh/KVM-arm64-Hypervisor-stack-enhancements/20220223-010522
git checkout 7fe99fd40f7c4b2973218045ca5b9c9160524db1
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
#define NULL ((void *)0)
^~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:200:27: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
[ESR_ELx_EC_FP_ASIMD] = kvm_hyp_handle_fpsimd,
^~~~~~~~~~~~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:196:28: note: previous initialization is here
[0 ... ESR_ELx_EC_MAX] = NULL,
^~~~
include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
#define NULL ((void *)0)
^~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:201:27: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
[ESR_ELx_EC_IABT_LOW] = kvm_hyp_handle_iabt_low,
^~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:196:28: note: previous initialization is here
[0 ... ESR_ELx_EC_MAX] = NULL,
^~~~
include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
#define NULL ((void *)0)
^~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:202:27: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
[ESR_ELx_EC_DABT_LOW] = kvm_hyp_handle_dabt_low,
^~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:196:28: note: previous initialization is here
[0 ... ESR_ELx_EC_MAX] = NULL,
^~~~
include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
#define NULL ((void *)0)
^~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:203:22: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
[ESR_ELx_EC_PAC] = kvm_hyp_handle_ptrauth,
^~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:196:28: note: previous initialization is here
[0 ... ESR_ELx_EC_MAX] = NULL,
^~~~
include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
#define NULL ((void *)0)
^~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:208:24: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
[ESR_ELx_EC_SYS64] = kvm_handle_pvm_sys64,
^~~~~~~~~~~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:207:28: note: previous initialization is here
[0 ... ESR_ELx_EC_MAX] = NULL,
^~~~
include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
#define NULL ((void *)0)
^~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:209:22: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
[ESR_ELx_EC_SVE] = kvm_handle_pvm_restricted,
^~~~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:207:28: note: previous initialization is here
[0 ... ESR_ELx_EC_MAX] = NULL,
^~~~
include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
#define NULL ((void *)0)
^~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:210:27: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
[ESR_ELx_EC_FP_ASIMD] = kvm_handle_pvm_fpsimd,
^~~~~~~~~~~~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:207:28: note: previous initialization is here
[0 ... ESR_ELx_EC_MAX] = NULL,
^~~~
include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
#define NULL ((void *)0)
^~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:211:27: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
[ESR_ELx_EC_IABT_LOW] = kvm_hyp_handle_iabt_low,
^~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:207:28: note: previous initialization is here
[0 ... ESR_ELx_EC_MAX] = NULL,
^~~~
include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
#define NULL ((void *)0)
^~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:212:27: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
[ESR_ELx_EC_DABT_LOW] = kvm_hyp_handle_dabt_low,
^~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:207:28: note: previous initialization is here
[0 ... ESR_ELx_EC_MAX] = NULL,
^~~~
include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
#define NULL ((void *)0)
^~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:213:22: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
[ESR_ELx_EC_PAC] = kvm_hyp_handle_ptrauth,
^~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:207:28: note: previous initialization is here
[0 ... ESR_ELx_EC_MAX] = NULL,
^~~~
include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
#define NULL ((void *)0)
^~~~~~~~~~~
arch/arm64/kvm/hyp/nvhe/switch.c:350:17: warning: no previous prototype for function 'hyp_panic' [-Wmissing-prototypes]
void __noreturn hyp_panic(void)
^
arch/arm64/kvm/hyp/nvhe/switch.c:350:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void __noreturn hyp_panic(void)
^
static
>> arch/arm64/kvm/hyp/nvhe/switch.c:372:17: warning: no previous prototype for function 'hyp_panic_bad_stack' [-Wmissing-prototypes]
void __noreturn hyp_panic_bad_stack(void)
^
arch/arm64/kvm/hyp/nvhe/switch.c:372:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void __noreturn hyp_panic_bad_stack(void)
^
static
arch/arm64/kvm/hyp/nvhe/switch.c:377:17: warning: no previous prototype for function 'kvm_unexpected_el2_exception' [-Wmissing-prototypes]
asmlinkage void kvm_unexpected_el2_exception(void)
^
arch/arm64/kvm/hyp/nvhe/switch.c:377:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
asmlinkage void kvm_unexpected_el2_exception(void)
^
static
16 warnings generated.

vim +/hyp_panic_bad_stack +372 arch/arm64/kvm/hyp/nvhe/switch.c

371
> 372 void __noreturn hyp_panic_bad_stack(void)
373 {
374 hyp_panic();
375 }
376

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0-DAY CI Kernel Test Service, Intel Corporation