From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: [Patch v3 1/2] x86/traps: Record last extable faulting address Date: Mon, 30 Sep 2013 18:46:55 +0100 Message-ID: <1380563216-16968-2-git-send-email-andrew.cooper3@citrix.com> References: <1380563216-16968-1-git-send-email-andrew.cooper3@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1380563216-16968-1-git-send-email-andrew.cooper3@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Xen-devel Cc: Andrew Cooper , Keir Fraser , Jan Beulich List-Id: xen-devel@lists.xenproject.org ... so the following patch can identify the location of faults leading to a decision to crash a domain. Signed-off-by: Andrew Cooper Acked-by: Keir Fraser CC: Keir Fraser CC: Jan Beulich --- xen/arch/x86/traps.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c index 72e8566..771e59a 100644 --- a/xen/arch/x86/traps.c +++ b/xen/arch/x86/traps.c @@ -89,6 +89,7 @@ static char __read_mostly opt_nmi[10] = "fatal"; string_param("nmi", opt_nmi); DEFINE_PER_CPU(u64, efer); +static DEFINE_PER_CPU(unsigned long, last_extable_addr); DEFINE_PER_CPU_READ_MOSTLY(u32, ler_msr); @@ -550,6 +551,7 @@ static inline void do_trap( { dprintk(XENLOG_ERR, "Trap %d: %p -> %p\n", trapnr, _p(regs->eip), _p(fixup)); + this_cpu(last_extable_addr) = regs->eip; regs->eip = fixup; return; } @@ -1038,6 +1040,7 @@ void do_invalid_op(struct cpu_user_regs *regs) die: if ( (fixup = search_exception_table(regs->eip)) != 0 ) { + this_cpu(last_extable_addr) = regs->eip; regs->eip = fixup; return; } @@ -1370,6 +1373,7 @@ void do_page_fault(struct cpu_user_regs *regs) perfc_incr(copy_user_faults); if ( unlikely(regs->error_code & PFEC_reserved_bit) ) reserved_bit_page_fault(addr, regs); + this_cpu(last_extable_addr) = regs->eip; regs->eip = fixup; return; } @@ -3062,6 +3066,7 @@ void do_general_protection(struct cpu_user_regs *regs) { dprintk(XENLOG_INFO, "GPF (%04x): %p -> %p\n", regs->error_code, _p(regs->eip), _p(fixup)); + this_cpu(last_extable_addr) = regs->eip; regs->eip = fixup; return; } -- 1.7.10.4