Re: [PATCH v1 3/3] KVM: arm64: add ESB in exception handler entry and exit.

From: kbuild test robot
Date: Sat Nov 04 2017 - 14:49:52 EST


Hi Dongjiu,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on v4.14-rc7 next-20171103]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Dongjiu-Geng/arm64-add-a-macro-for-SError-synchronization/20171104-224216
base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: arm64-allmodconfig (attached as .config)
compiler: aarch64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=arm64

All errors (new ones prefixed by >>):

arch/arm64/kvm/hyp/entry.S: Assembler messages:
>> arch/arm64/kvm/hyp/entry.S:88: Error: selected processor does not support `esb'
--
arch/arm64/kvm/hyp/hyp-entry.S: Assembler messages:
>> arch/arm64/kvm/hyp/hyp-entry.S:57: Error: selected processor does not support `esb'

vim +88 arch/arm64/kvm/hyp/entry.S

51
52 /*
53 * u64 __guest_enter(struct kvm_vcpu *vcpu,
54 * struct kvm_cpu_context *host_ctxt);
55 */
56 ENTRY(__guest_enter)
57 // x0: vcpu
58 // x1: host context
59 // x2-x17: clobbered by macros
60 // x18: guest context
61
62 // Store the host regs
63 save_callee_saved_regs x1
64
65 // Store the host_ctxt for use at exit time
66 str x1, [sp, #-16]!
67
68 add x18, x0, #VCPU_CONTEXT
69
70 // Restore guest regs x0-x17
71 ldp x0, x1, [x18, #CPU_XREG_OFFSET(0)]
72 ldp x2, x3, [x18, #CPU_XREG_OFFSET(2)]
73 ldp x4, x5, [x18, #CPU_XREG_OFFSET(4)]
74 ldp x6, x7, [x18, #CPU_XREG_OFFSET(6)]
75 ldp x8, x9, [x18, #CPU_XREG_OFFSET(8)]
76 ldp x10, x11, [x18, #CPU_XREG_OFFSET(10)]
77 ldp x12, x13, [x18, #CPU_XREG_OFFSET(12)]
78 ldp x14, x15, [x18, #CPU_XREG_OFFSET(14)]
79 ldp x16, x17, [x18, #CPU_XREG_OFFSET(16)]
80
81 // Restore guest regs x19-x29, lr
82 restore_callee_saved_regs x18
83
84 // Restore guest reg x18
85 ldr x18, [x18, #CPU_XREG_OFFSET(18)]
86
87 // synchronize host pending asynchronous error
> 88 error_synchronize
89 // Do not touch any register after this!
90 eret
91 ENDPROC(__guest_enter)
92

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