when the pfn is KVM_PFN_ERR_HWPOISON, it indicates to send
SIGBUS signal from KVM's fault-handling code to qemu, qemu
can handle this signal according to the fault address.
Signed-off-by: Dongjiu Geng <gengdongjiu@xxxxxxxxxx>
---
arch/arm/kvm/mmu.c | 20 ++++++++++++++++++++
include/linux/kvm_host.h | 5 +++++
2 files changed, 25 insertions(+)
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 962616fd4ddd..1307ec400de3 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -1237,6 +1237,20 @@ static void coherent_cache_guest_page(struct kvm_vcpu *vcpu, kvm_pfn_t pfn,
__coherent_cache_guest_page(vcpu, pfn, size);
}
+static void kvm_send_hwpoison_signal(unsigned long address,
+ struct task_struct *tsk)
+{
+ siginfo_t info;
+
+ 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 user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
struct kvm_memory_slot *memslot, unsigned long hva,
unsigned long fault_status)
@@ -1309,6 +1323,12 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
if (is_error_noslot_pfn(pfn))
return -EFAULT;
+ if (is_error_hwpoison_pfn(pfn)) {
+ kvm_send_hwpoison_signal(kvm_vcpu_gfn_to_hva(vcpu, gfn),
+ current);
+ return -EFAULT;
+ }
+
if (kvm_is_device_pfn(pfn)) {
mem_type = PAGE_S2_DEVICE;
flags |= KVM_S2PTE_FLAG_IS_IOMAP;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 2c14ad9809da..610ded9ebe9b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -91,6 +91,11 @@ static inline bool is_noslot_pfn(kvm_pfn_t pfn)
{
return pfn == KVM_PFN_NOSLOT;
}
+/* hwpoison pfn indicates that it needs to send SIGBUS */
+static inline bool is_error_hwpoison_pfn(kvm_pfn_t pfn)
+{
+ return pfn == KVM_PFN_ERR_HWPOISON;
+}
/*
* architectures with KVM_HVA_ERR_BAD other than PAGE_OFFSET (e.g. s390)
--
2.11.0
