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arm64: hwpoison: add VM_FAULT_HWPOISON[_LARGE] handling 

Add VM_FAULT_HWPOISON[_LARGE] handling to the arm64 page fault
handler. Handling of VM_FAULT_HWPOISON[_LARGE] is very similar
to VM_FAULT_OOM, the only difference is that a different si_code
(BUS_MCEERR_AR) is passed to user space and si_addr_lsb field is
initialized.

Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
(fix new __do_user_fault call-site)
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Acked-by: Steve Capper <steve.capper@arm.com>
Tested-by: Manoj Iyer <manoj.iyer@canonical.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Jonathan (Zhixiong) Zhang 2017-06-08 18:25:27 +01:00 committed by Will Deacon
parent f02ab08afb
commit e7c600f149
1 changed files with 19 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
arch/arm64/mm/fault.c
View File

@ -31,6 +31,7 @@
#include <linux/highmem.h>
#include <linux/perf_event.h>
#include <linux/preempt.h>
#include <linux/hugetlb.h>
#include <asm/bug.h>
#include <asm/cpufeature.h>
@ -256,10 +257,11 @@ static void __do_kernel_fault(unsigned long addr, unsigned int esr,
*/
static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
unsigned int esr, unsigned int sig, int code,
struct pt_regs *regs)
struct pt_regs *regs, int fault)
{
struct siginfo si;
const struct fault_info *inf;
unsigned int lsb = 0;
if (unhandled_signal(tsk, sig) && show_unhandled_signals_ratelimited()) {
inf = esr_to_fault_info(esr);
@ -277,6 +279,17 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
si.si_errno = 0;
si.si_code = code;
si.si_addr = (void __user *)addr;
/*
* Either small page or large page may be poisoned.
* In other words, VM_FAULT_HWPOISON_LARGE and
* VM_FAULT_HWPOISON are mutually exclusive.
*/
if (fault & VM_FAULT_HWPOISON_LARGE)
lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));
else if (fault & VM_FAULT_HWPOISON)
lsb = PAGE_SHIFT;
si.si_addr_lsb = lsb;
force_sig_info(sig, &si, tsk);
}
@ -291,7 +304,7 @@ static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *re
*/
if (user_mode(regs)) {
inf = esr_to_fault_info(esr);
__do_user_fault(tsk, addr, esr, inf->sig, inf->code, regs);
__do_user_fault(tsk, addr, esr, inf->sig, inf->code, regs, 0);
} else
__do_kernel_fault(addr, esr, regs);
}
@ -478,6 +491,9 @@ retry:
*/
sig = SIGBUS;
code = BUS_ADRERR;
} else if (fault & (VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE)) {
sig = SIGBUS;
code = BUS_MCEERR_AR;
} else {
/*
* Something tried to access memory that isn't in our memory
@ -488,7 +504,7 @@ retry:
SEGV_ACCERR : SEGV_MAPERR;
}
__do_user_fault(tsk, addr, esr, sig, code, regs);
__do_user_fault(tsk, addr, esr, sig, code, regs, fault);
return 0;
no_context: