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KVM: MCE: Send SRAR SIGBUS directly

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Originally, SRAR SIGBUS is sent to QEMU-KVM via touching the poisoned
page. But commit 9605456919 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>
This commit is contained in:
Huang Ying 2010-10-08 16:24:15 +08:00 committed by Avi Kivity
parent 5854dbca9b
commit 77db5cbd29
1 changed files with 10 additions and 8 deletions
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18
arch/x86/kvm/mmu.c
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@ -2251,22 +2251,24 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
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;