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SubjectRe: [tip:x86/sev 55/55] arch/x86/kernel/sev.c:605:17: sparse: sparse: incorrect type in argument 1 (different address spaces)
On Mon, May 02, 2022 at 10:19:04PM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/sev
> head: c2106a231c2ba36ff9af50cdf2867b9a5f8150a6
> commit: c2106a231c2ba36ff9af50cdf2867b9a5f8150a6 [55/55] x86/sev: Get the AP jump table address from secrets page
> config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20220502/202205022233.XgNDR7WR-lkp@intel.com/config)
> compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
> reproduce:
> # apt-get install sparse
> # sparse version: v0.6.4-dirty
> # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=c2106a231c2ba36ff9af50cdf2867b9a5f8150a6
> git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
> git fetch --no-tags tip x86/sev
> git checkout c2106a231c2ba36ff9af50cdf2867b9a5f8150a6
> # save the config file
> mkdir build_dir && cp config build_dir/.config
> make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/
>
> 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/kernel/sev.c:605:17: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got struct snp_secrets_page_layout *[assigned] layout @@
> arch/x86/kernel/sev.c:605:17: sparse: expected void volatile [noderef] __iomem *addr
> arch/x86/kernel/sev.c:605:17: sparse: got struct snp_secrets_page_layout *[assigned] layout
>
> vim +605 arch/x86/kernel/sev.c
>
> 588
> 589 static u64 __init get_snp_jump_table_addr(void)
> 590 {
> 591 struct snp_secrets_page_layout *layout;
> 592 u64 pa, addr;
> 593
> 594 pa = get_secrets_page();
> 595 if (!pa)
> 596 return 0;
> 597
> 598 layout = (__force void *)ioremap_encrypted(pa, PAGE_SIZE);
> 599 if (!layout) {
> 600 pr_err("Unable to locate AP jump table address: failed to map the SNP secrets page.\n");
> 601 return 0;
> 602 }
> 603
> 604 addr = layout->os_area.ap_jump_table_pa;
> > 605 iounmap(layout);
> 606
> 607 return addr;
> 608 }
> 609
>
> --

Mike, that ok?

---
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index 166375084b1f..c05f0124c410 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -589,20 +589,23 @@ static u64 __init get_secrets_page(void)
static u64 __init get_snp_jump_table_addr(void)
{
struct snp_secrets_page_layout *layout;
+ void __iomem *mem;
u64 pa, addr;

pa = get_secrets_page();
if (!pa)
return 0;

- layout = (__force void *)ioremap_encrypted(pa, PAGE_SIZE);
- if (!layout) {
+ mem = ioremap_encrypted(pa, PAGE_SIZE);
+ if (!mem) {
pr_err("Unable to locate AP jump table address: failed to map the SNP secrets page.\n");
return 0;
}

+ layout = (__force struct snp_secrets_page_layout *)mem;
+
addr = layout->os_area.ap_jump_table_pa;
- iounmap(layout);
+ iounmap(mem);

return addr;
}
--
Regards/Gruss,
Boris.

SUSE Software Solutions Germany GmbH, GF: Ivo Totev, HRB 36809, AG Nürnberg

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