mm: make __get_user_pages return -EHWPOISON for HWPOISON page optionally (69ebb83e) · Commits · 戴 / test

Make __get_user_pages return -EHWPOISON for HWPOISON page only if FOLL_HWPOISON is specified. With this patch, the interested callers can distinguish HWPOISON pages from general FAULT pages, while other callers will still get -EFAULT for all these pages, so the user space interface need not to be changed. This feature is needed by KVM, where UCR MCE should be relayed to guest for HWPOISON page, while instruction emulation and MMIO will be tried for general FAULT page. The idea comes from Andrew Morton. Signed-off-by:

Huang Ying <ying.huang@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:

Avi Kivity <avi@redhat.com>

arch/alpha/include/asm/errno.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -122,4 +122,6 @@

		#define ERFKILL 138 /* Operation not possible due to RF-kill */

		#define EHWPOISON 139 /* Memory page has hardware error */

		#endif

arch/mips/include/asm/errno.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -121,6 +121,8 @@

		#define ERFKILL 167 /* Operation not possible due to RF-kill */

		#define EHWPOISON 168 /* Memory page has hardware error */

		#define EDQUOT 1133 /* Quota exceeded */

		#ifdef __KERNEL__

arch/parisc/include/asm/errno.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -122,4 +122,6 @@

		#define ERFKILL 256 /* Operation not possible due to RF-kill */

		#define EHWPOISON 257 /* Memory page has hardware error */

		#endif

arch/sparc/include/asm/errno.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -112,4 +112,6 @@

		#define ERFKILL 134 /* Operation not possible due to RF-kill */

		#define EHWPOISON 135 /* Memory page has hardware error */

		#endif

include/asm-generic/errno.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -108,4 +108,6 @@

		#define ERFKILL 132 /* Operation not possible due to RF-kill */

		#define EHWPOISON 133 /* Memory page has hardware error */

		#endif

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