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target/ppc: Handle NMI guest exit

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Memory error such as bit flips that cannot be corrected
by hardware are passed on to the kernel for handling.
If the memory address in error belongs to guest then
the guest kernel is responsible for taking suitable action.
Patch [1] enhances KVM to exit guest with exit reason
set to KVM_EXIT_NMI in such cases. This patch handles
KVM_EXIT_NMI exit.

[1] https://www.spinics.net/lists/kvm-ppc/msg12637.html
    (e20bbd3d and related commits)

Signed-off-by: Aravinda Prasad <arawinda.p@gmail.com>
Signed-off-by: Ganesh Goudar <ganeshgr@linux.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <20200130184423.20519-4-ganeshgr@linux.ibm.com>
[dwg: #ifdefs to fix compile for 32-bit target]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Aravinda Prasad 2020-01-31 00:14:19 +05:30 • committed by David Gibson
parent 9d953ce447
commit 9ac703ac5f
6 changed files with 76 additions and 0 deletions
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37
hw/ppc/spapr_events.c
View file

@ -40,6 +40,7 @@
#include "hw/ppc/spapr_drc.h"
#include "qemu/help_option.h"
#include "qemu/bcd.h"
#include "qemu/main-loop.h"
#include "hw/ppc/spapr_ovec.h"
#include <libfdt.h>
@ -622,6 +623,42 @@ void spapr_hotplug_req_remove_by_count_indexed(SpaprDrcType drc_type,
RTAS_LOG_V6_HP_ACTION_REMOVE, drc_type, &drc_id);
}
void spapr_mce_req_event(PowerPCCPU *cpu)
{
SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
CPUState *cs = CPU(cpu);
if (spapr->guest_machine_check_addr == -1) {
/*
* This implies that we have hit a machine check either when the
* guest has not registered FWNMI (i.e., "ibm,nmi-register" not
* called) or between system reset and "ibm,nmi-register".
* Fall back to the old machine check behavior in such cases.
*/
cs->exception_index = POWERPC_EXCP_MCHECK;
ppc_cpu_do_interrupt(cs);
return;
}
while (spapr->mc_status != -1) {
/*
* Check whether the same CPU got machine check error
* while still handling the mc error (i.e., before
* that CPU called "ibm,nmi-interlock")
*/
if (spapr->mc_status == cpu->vcpu_id) {
qemu_system_guest_panicked(NULL);
return;
}
qemu_cond_wait_iothread(&spapr->mc_delivery_cond);
/* Meanwhile if the system is reset, then just return */
if (spapr->guest_machine_check_addr == -1) {
return;
}
}
spapr->mc_status = cpu->vcpu_id;
}
static void check_exception(PowerPCCPU *cpu, SpaprMachineState *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,