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| author | Aravinda Prasad <aravinda@linux.vnet.ibm.com> | 2017-05-11 13:02:48 +0200 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2017-06-21 05:37:08 +0200 |
| commit | 134764ed6e12d9f99b3de68b8aaeae1ba842d91c (patch) | |
| tree | 3cf9dad6e4bf242274a3a5913ec2110d62436074 /include/uapi | |
| parent | KVM: PPC: Book3S HV: Don't sleep if XIVE interrupt pending on POWER9 (diff) | |
| download | linux-134764ed6e12d9f99b3de68b8aaeae1ba842d91c.tar.xz linux-134764ed6e12d9f99b3de68b8aaeae1ba842d91c.zip | |
KVM: PPC: Book3S HV: Add new capability to control MCE behaviour
This introduces a new KVM capability to control how KVM behaves
on machine check exception (MCE) in HV KVM guests.
If this capability has not been enabled, KVM redirects machine check
exceptions to guest's 0x200 vector, if the address in error belongs to
the guest. With this capability enabled, KVM will cause a guest exit
with the exit reason indicating an NMI.
The new capability is required to avoid problems if a new kernel/KVM
is used with an old QEMU, running a guest that doesn't issue
"ibm,nmi-register". As old QEMU does not understand the NMI exit
type, it treats it as a fatal error. However, the guest could have
handled the machine check error if the exception was delivered to
guest's 0x200 interrupt vector instead of NMI exit in case of old
QEMU.
[paulus@ozlabs.org - Reworded the commit message to be clearer,
enable only on HV KVM.]
Signed-off-by: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/kvm.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 577429a95ad8..89bc145b4051 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -895,6 +895,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_SPAPR_TCE_VFIO 142 #define KVM_CAP_X86_GUEST_MWAIT 143 #define KVM_CAP_ARM_USER_IRQ 144 +#define KVM_CAP_PPC_FWNMI 145 #ifdef KVM_CAP_IRQ_ROUTING |