From: Ganesh Goudar <ganeshgr@linux.ibm.com>
To: aik@ozlabs.ru, qemu-ppc@nongnu.org, qemu-devel@nongnu.org,
david@gibson.dropbear.id.au
Cc: paulus@ozlabs.org, arawinda.p@gmail.com,
Ganesh Goudar <ganeshgr@linux.ibm.com>,
groug@kaod.org
Subject: [PATCH v15 2/7] ppc: spapr: Introduce FWNMI capability
Date: Wed, 9 Oct 2019 14:40:05 +0530 [thread overview]
Message-ID: <20191009091010.16467-3-ganeshgr@linux.ibm.com> (raw)
In-Reply-To: <20191009091010.16467-1-ganeshgr@linux.ibm.com>
From: Aravinda Prasad <arawinda.p@gmail.com>
Introduce the KVM capability KVM_CAP_PPC_FWNMI so that
the KVM causes guest exit with NMI as exit reason
when it encounters a machine check exception on the
address belonging to a guest. Without this capability
enabled, KVM redirects machine check exceptions to
guest's 0x200 vector.
This patch also introduces fwnmi-mce capability to
deal with the case when a guest with the
KVM_CAP_PPC_FWNMI capability enabled is attempted
to migrate to a host that does not support this
capability.
[eliminate cap_ppc_fwnmi]
Signed-off-by: Ganesh Goudar <ganeshgr@linux.ibm.com>
Signed-off-by: Aravinda Prasad <arawinda.p@gmail.com>
---
hw/ppc/spapr.c | 1 +
hw/ppc/spapr_caps.c | 29 +++++++++++++++++++++++++++++
include/hw/ppc/spapr.h | 4 +++-
target/ppc/kvm.c | 8 ++++++++
target/ppc/kvm_ppc.h | 6 ++++++
5 files changed, 47 insertions(+), 1 deletion(-)
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 08a2a5a770..9b5f65c655 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -4488,6 +4488,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
smc->default_caps.caps[SPAPR_CAP_NESTED_KVM_HV] = SPAPR_CAP_OFF;
smc->default_caps.caps[SPAPR_CAP_LARGE_DECREMENTER] = SPAPR_CAP_ON;
smc->default_caps.caps[SPAPR_CAP_CCF_ASSIST] = SPAPR_CAP_OFF;
+ smc->default_caps.caps[SPAPR_CAP_FWNMI_MCE] = SPAPR_CAP_OFF;
spapr_caps_add_properties(smc, &error_abort);
smc->irq = &spapr_irq_dual;
smc->dr_phb_enabled = true;
diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c
index 481dfd2a27..778bf32181 100644
--- a/hw/ppc/spapr_caps.c
+++ b/hw/ppc/spapr_caps.c
@@ -496,6 +496,25 @@ static void cap_ccf_assist_apply(SpaprMachineState *spapr, uint8_t val,
}
}
+static void cap_fwnmi_mce_apply(SpaprMachineState *spapr, uint8_t val,
+ Error **errp)
+{
+ if (!val) {
+ return; /* Disabled by default */
+ }
+
+ if (tcg_enabled()) {
+ /*
+ * TCG support may not be correct in some conditions (e.g., in case
+ * of software injected faults like duplicate SLBs).
+ */
+ warn_report("Firmware Assisted Non-Maskable Interrupts not supported in TCG");
+ } else if (kvm_enabled() && kvmppc_set_fwnmi()) {
+ error_setg(errp,
+"Firmware Assisted Non-Maskable Interrupts not supported by KVM, try cap-fwnmi-mce=off");
+ }
+}
+
SpaprCapabilityInfo capability_table[SPAPR_CAP_NUM] = {
[SPAPR_CAP_HTM] = {
.name = "htm",
@@ -595,6 +614,15 @@ SpaprCapabilityInfo capability_table[SPAPR_CAP_NUM] = {
.type = "bool",
.apply = cap_ccf_assist_apply,
},
+ [SPAPR_CAP_FWNMI_MCE] = {
+ .name = "fwnmi-mce",
+ .description = "Handle fwnmi machine check exceptions",
+ .index = SPAPR_CAP_FWNMI_MCE,
+ .get = spapr_cap_get_bool,
+ .set = spapr_cap_set_bool,
+ .type = "bool",
+ .apply = cap_fwnmi_mce_apply,
+ },
};
static SpaprCapabilities default_caps_with_cpu(SpaprMachineState *spapr,
@@ -734,6 +762,7 @@ SPAPR_CAP_MIG_STATE(hpt_maxpagesize, SPAPR_CAP_HPT_MAXPAGESIZE);
SPAPR_CAP_MIG_STATE(nested_kvm_hv, SPAPR_CAP_NESTED_KVM_HV);
SPAPR_CAP_MIG_STATE(large_decr, SPAPR_CAP_LARGE_DECREMENTER);
SPAPR_CAP_MIG_STATE(ccf_assist, SPAPR_CAP_CCF_ASSIST);
+SPAPR_CAP_MIG_STATE(fwnmi, SPAPR_CAP_FWNMI_MCE);
void spapr_caps_init(SpaprMachineState *spapr)
{
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 03111fd55b..66049ac611 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -79,8 +79,10 @@ typedef enum {
#define SPAPR_CAP_LARGE_DECREMENTER 0x08
/* Count Cache Flush Assist HW Instruction */
#define SPAPR_CAP_CCF_ASSIST 0x09
+/* FWNMI machine check handling */
+#define SPAPR_CAP_FWNMI_MCE 0x0A
/* Num Caps */
-#define SPAPR_CAP_NUM (SPAPR_CAP_CCF_ASSIST + 1)
+#define SPAPR_CAP_NUM (SPAPR_CAP_FWNMI_MCE + 1)
/*
* Capability Values
diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
index 8c5b1f25cc..e9cae0ded6 100644
--- a/target/ppc/kvm.c
+++ b/target/ppc/kvm.c
@@ -2055,6 +2055,14 @@ void kvmppc_set_mpic_proxy(PowerPCCPU *cpu, int mpic_proxy)
}
}
+int kvmppc_set_fwnmi(void)
+{
+ PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
+ CPUState *cs = CPU(cpu);
+
+ return kvm_vcpu_enable_cap(cs, KVM_CAP_PPC_FWNMI, 0);
+}
+
int kvmppc_smt_threads(void)
{
return cap_ppc_smt ? cap_ppc_smt : 1;
diff --git a/target/ppc/kvm_ppc.h b/target/ppc/kvm_ppc.h
index 98bd7d5da6..5727a5025f 100644
--- a/target/ppc/kvm_ppc.h
+++ b/target/ppc/kvm_ppc.h
@@ -27,6 +27,7 @@ void kvmppc_enable_h_page_init(void);
void kvmppc_set_papr(PowerPCCPU *cpu);
int kvmppc_set_compat(PowerPCCPU *cpu, uint32_t compat_pvr);
void kvmppc_set_mpic_proxy(PowerPCCPU *cpu, int mpic_proxy);
+int kvmppc_set_fwnmi(void);
int kvmppc_smt_threads(void);
void kvmppc_hint_smt_possible(Error **errp);
int kvmppc_set_smt_threads(int smt);
@@ -159,6 +160,11 @@ static inline void kvmppc_set_mpic_proxy(PowerPCCPU *cpu, int mpic_proxy)
{
}
+static inline int kvmppc_set_fwnmi(void)
+{
+ return -1;
+}
+
static inline int kvmppc_smt_threads(void)
{
return 1;
--
2.17.2
next prev parent reply other threads:[~2019-10-09 20:49 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-09 9:10 [PATCH v15 0/7] target-ppc/spapr: Add FWNMI support in QEMU for PowerKVM guests Ganesh Goudar
2019-10-09 9:10 ` [PATCH v15 1/7] Wrapper function to wait on condition for the main loop mutex Ganesh Goudar
2019-10-09 9:10 ` Ganesh Goudar [this message]
2019-10-09 9:10 ` [PATCH v15 3/7] target/ppc: Handle NMI guest exit Ganesh Goudar
2019-10-09 9:10 ` [PATCH v15 4/7] target/ppc: Build rtas error log upon an MCE Ganesh Goudar
2019-10-09 9:10 ` [PATCH v15 5/7] ppc: spapr: Handle "ibm, nmi-register" and "ibm, nmi-interlock" RTAS calls Ganesh Goudar
2019-10-09 9:10 ` [PATCH v15 6/7] migration: Include migration support for machine check handling Ganesh Goudar
2019-10-09 9:10 ` [PATCH v15 7/7] ppc: spapr: Activate the FWNMI functionality Ganesh Goudar
2019-10-10 1:02 ` [PATCH v15 0/7] target-ppc/spapr: Add FWNMI support in QEMU for PowerKVM guests no-reply
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