KVM: MCE: Send SRAR SIGBUS directly
Originally, SRAR SIGBUS is sent to QEMU-KVM via touching the poisoned
page. But commit 96054569190bdec375fe824e48ca1f4e3b53dd36 prevents the
signal from being sent. So now the signal is sent via
force_sig_info_fault directly.
[marcelo: use send_sig_info instead]
Reported-by: Dean Nelson <dnelson@redhat.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index eb65b9c..908ea54 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2251,22 +2251,24 @@
return pt_write;
}
-static void kvm_send_hwpoison_signal(struct kvm *kvm, gfn_t gfn)
+static void kvm_send_hwpoison_signal(unsigned long address, struct task_struct *tsk)
{
- char buf[1];
- void __user *hva;
- int r;
+ siginfo_t info;
- /* Touch the page, so send SIGBUS */
- hva = (void __user *)gfn_to_hva(kvm, gfn);
- r = copy_from_user(buf, hva, 1);
+ info.si_signo = SIGBUS;
+ info.si_errno = 0;
+ info.si_code = BUS_MCEERR_AR;
+ info.si_addr = (void __user *)address;
+ info.si_addr_lsb = PAGE_SHIFT;
+
+ send_sig_info(SIGBUS, &info, tsk);
}
static int kvm_handle_bad_page(struct kvm *kvm, gfn_t gfn, pfn_t pfn)
{
kvm_release_pfn_clean(pfn);
if (is_hwpoison_pfn(pfn)) {
- kvm_send_hwpoison_signal(kvm, gfn);
+ kvm_send_hwpoison_signal(gfn_to_hva(kvm, gfn), current);
return 0;
} else if (is_fault_pfn(pfn))
return -EFAULT;