linux-kernel - Re: [PATCH hyperv-next v4 05/16] Drivers: hv: Rename fields for SynIC message and event pages

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Message-ID: <202507160553.amoW6Ty0-lkp@intel.com>
Date: Wed, 16 Jul 2025 05:46:34 +0800
From: kernel test robot <lkp@...el.com>
To: Roman Kisel <romank@...ux.microsoft.com>, alok.a.tiwari@...cle.com,
	arnd@...db.de, bp@...en8.de, corbet@....net,
	dave.hansen@...ux.intel.com, decui@...rosoft.com,
	haiyangz@...rosoft.com, hpa@...or.com, kys@...rosoft.com,
	mhklinux@...look.com, mingo@...hat.com, rdunlap@...radead.org,
	tglx@...utronix.de, Tianyu.Lan@...rosoft.com, wei.liu@...nel.org,
	linux-arch@...r.kernel.org, linux-coco@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org
Cc: oe-kbuild-all@...ts.linux.dev, apais@...rosoft.com,
	benhill@...rosoft.com, bperkins@...rosoft.com,
	sunilmut@...rosoft.com
Subject: Re: [PATCH hyperv-next v4 05/16] Drivers: hv: Rename fields for
 SynIC message and event pages

Hi Roman,

kernel test robot noticed the following build warnings:

[auto build test WARNING on d9016a249be5316ec2476f9947356711e70a16ec]

url:    https://github.com/intel-lab-lkp/linux/commits/Roman-Kisel/Documentation-hyperv-Confidential-VMBus/20250715-062125
base:   d9016a249be5316ec2476f9947356711e70a16ec
patch link:    https://lore.kernel.org/r/20250714221545.5615-6-romank%40linux.microsoft.com
patch subject: [PATCH hyperv-next v4 05/16] Drivers: hv: Rename fields for SynIC message and event pages
config: i386-randconfig-061-20250715 (https://download.01.org/0day-ci/archive/20250716/202507160553.amoW6Ty0-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250716/202507160553.amoW6Ty0-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507160553.amoW6Ty0-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/hv/hv.c:280:26: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/hv/hv.c:299:26: sparse: sparse: cast removes address space '__iomem' of expression
>> drivers/hv/hv.c:361:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void volatile [noderef] __iomem *addr @@     got void *hyp_synic_message_page @@
   drivers/hv/hv.c:361:31: sparse:     expected void volatile [noderef] __iomem *addr
   drivers/hv/hv.c:361:31: sparse:     got void *hyp_synic_message_page
>> drivers/hv/hv.c:373:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void volatile [noderef] __iomem *addr @@     got void *hyp_synic_event_page @@
   drivers/hv/hv.c:373:31: sparse:     expected void volatile [noderef] __iomem *addr
   drivers/hv/hv.c:373:31: sparse:     got void *hyp_synic_event_page

vim +361 drivers/hv/hv.c

   334	
   335	void hv_synic_disable_regs(unsigned int cpu)
   336	{
   337		struct hv_per_cpu_context *hv_cpu =
   338			per_cpu_ptr(hv_context.cpu_context, cpu);
   339		union hv_synic_sint shared_sint;
   340		union hv_synic_simp simp;
   341		union hv_synic_siefp siefp;
   342		union hv_synic_scontrol sctrl;
   343	
   344		shared_sint.as_uint64 = hv_get_msr(HV_MSR_SINT0 + VMBUS_MESSAGE_SINT);
   345	
   346		shared_sint.masked = 1;
   347	
   348		/* Need to correctly cleanup in the case of SMP!!! */
   349		/* Disable the interrupt */
   350		hv_set_msr(HV_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
   351	
   352		simp.as_uint64 = hv_get_msr(HV_MSR_SIMP);
   353		/*
   354		 * In Isolation VM, sim and sief pages are allocated by
   355		 * paravisor. These pages also will be used by kdump
   356		 * kernel. So just reset enable bit here and keep page
   357		 * addresses.
   358		 */
   359		simp.simp_enabled = 0;
   360		if (ms_hyperv.paravisor_present || hv_root_partition()) {
 > 361			iounmap(hv_cpu->hyp_synic_message_page);
   362			hv_cpu->hyp_synic_message_page = NULL;
   363		} else {
   364			simp.base_simp_gpa = 0;
   365		}
   366	
   367		hv_set_msr(HV_MSR_SIMP, simp.as_uint64);
   368	
   369		siefp.as_uint64 = hv_get_msr(HV_MSR_SIEFP);
   370		siefp.siefp_enabled = 0;
   371	
   372		if (ms_hyperv.paravisor_present || hv_root_partition()) {
 > 373			iounmap(hv_cpu->hyp_synic_event_page);
   374			hv_cpu->hyp_synic_event_page = NULL;
   375		} else {
   376			siefp.base_siefp_gpa = 0;
   377		}
   378	
   379		hv_set_msr(HV_MSR_SIEFP, siefp.as_uint64);
   380	
   381		/* Disable the global synic bit */
   382		sctrl.as_uint64 = hv_get_msr(HV_MSR_SCONTROL);
   383		sctrl.enable = 0;
   384		hv_set_msr(HV_MSR_SCONTROL, sctrl.as_uint64);
   385	
   386		if (vmbus_irq != -1)
   387			disable_percpu_irq(vmbus_irq);
   388	}
   389	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki