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Subjectarch/x86/hyperv/ivm.c:39:30: sparse: sparse: incorrect type in initializer (different address spaces)
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 79a72162048e42a677bc7336a9f5d86fc3ff9558
commit: faff44069ff538ccdfef187c4d7ec83d22dfb3a4 x86/hyperv: Add Write/Read MSR registers via ghcb page
date: 5 weeks ago
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20211205/202112051255.MPUcV06E-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.4-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=faff44069ff538ccdfef187c4d7ec83d22dfb3a4
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout faff44069ff538ccdfef187c4d7ec83d22dfb3a4
# save the config file to linux build tree
mkdir build_dir
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/hyperv/ drivers/hv/

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


sparse warnings: (new ones prefixed by >>)
>> arch/x86/hyperv/ivm.c:39:30: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got union hv_ghcb [noderef] __percpu ** @@
arch/x86/hyperv/ivm.c:39:30: sparse: expected void const [noderef] __percpu *__vpp_verify
arch/x86/hyperv/ivm.c:39:30: sparse: got union hv_ghcb [noderef] __percpu **
arch/x86/hyperv/ivm.c:74:30: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got union hv_ghcb [noderef] __percpu ** @@
arch/x86/hyperv/ivm.c:74:30: sparse: expected void const [noderef] __percpu *__vpp_verify
arch/x86/hyperv/ivm.c:74:30: sparse: got union hv_ghcb [noderef] __percpu **
arch/x86/hyperv/ivm.c:154:25: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got void [noderef] __percpu ** @@
arch/x86/hyperv/ivm.c:154:25: sparse: expected void const [noderef] __percpu *__vpp_verify
arch/x86/hyperv/ivm.c:154:25: sparse: got void [noderef] __percpu **
--
drivers/hv/vmbus_drv.c: note: in included file (through arch/x86/include/asm/msr.h, arch/x86/include/asm/processor.h, arch/x86/include/asm/timex.h, ...):
>> arch/x86/include/asm/paravirt.h:221:9: sparse: sparse: cast truncates bits from constant value (c000000000100000 becomes 100000)
arch/x86/include/asm/paravirt.h:221:9: sparse: sparse: cast truncates bits from constant value (c000000000000000 becomes 0)

vim +39 arch/x86/hyperv/ivm.c

25
26 void hv_ghcb_msr_write(u64 msr, u64 value)
27 {
28 union hv_ghcb *hv_ghcb;
29 void **ghcb_base;
30 unsigned long flags;
31 struct es_em_ctxt ctxt;
32
33 if (!hv_ghcb_pg)
34 return;
35
36 WARN_ON(in_nmi());
37
38 local_irq_save(flags);
> 39 ghcb_base = (void **)this_cpu_ptr(hv_ghcb_pg);
40 hv_ghcb = (union hv_ghcb *)*ghcb_base;
41 if (!hv_ghcb) {
42 local_irq_restore(flags);
43 return;
44 }
45
46 ghcb_set_rcx(&hv_ghcb->ghcb, msr);
47 ghcb_set_rax(&hv_ghcb->ghcb, lower_32_bits(value));
48 ghcb_set_rdx(&hv_ghcb->ghcb, upper_32_bits(value));
49
50 if (sev_es_ghcb_hv_call(&hv_ghcb->ghcb, false, &ctxt,
51 SVM_EXIT_MSR, 1, 0))
52 pr_warn("Fail to write msr via ghcb %llx.\n", msr);
53
54 local_irq_restore(flags);
55 }
56 EXPORT_SYMBOL_GPL(hv_ghcb_msr_write);
57

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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