qemu-ppc
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PATCH v20 5/7] ppc: spapr: Handle "ibm,nmi-register" and "ibm,nmi-i


From: Ganesh
Subject: Re: [PATCH v20 5/7] ppc: spapr: Handle "ibm,nmi-register" and "ibm,nmi-interlock" RTAS calls
Date: Mon, 20 Jan 2020 22:48:20 +0530
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1



On 1/20/20 6:16 AM, David Gibson wrote:
On Fri, Jan 17, 2020 at 03:08:53PM +0530, Ganesh Goudar wrote:
From: Aravinda Prasad <address@hidden>

This patch adds support in QEMU to handle "ibm,nmi-register"
and "ibm,nmi-interlock" RTAS calls.

The machine check notification address is saved when the
OS issues "ibm,nmi-register" RTAS call.

This patch also handles the case when multiple processors
experience machine check at or about the same time by
handling "ibm,nmi-interlock" call. In such cases, as per
PAPR, subsequent processors serialize waiting for the first
processor to issue the "ibm,nmi-interlock" call. The second
processor that also received a machine check error waits
till the first processor is done reading the error log.
The first processor issues "ibm,nmi-interlock" call
when the error log is consumed.

Signed-off-by: Aravinda Prasad <address@hidden>
[Register fwnmi RTAS calls in core_rtas_register_types()
  where other RTAS calls are registered]
Signed-off-by: Ganesh Goudar <address@hidden>
---
  hw/ppc/spapr_caps.c    |  7 +++++
  hw/ppc/spapr_rtas.c    | 59 ++++++++++++++++++++++++++++++++++++++++++
  include/hw/ppc/spapr.h |  4 ++-
  3 files changed, 69 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c
index 3001098601..c43498da49 100644
--- a/hw/ppc/spapr_caps.c
+++ b/hw/ppc/spapr_caps.c
@@ -502,6 +502,13 @@ static void cap_fwnmi_mce_apply(SpaprMachineState *spapr, 
uint8_t val,
      if (!val) {
          return; /* Disabled by default */
      }
+
+    if (kvm_enabled()) {
+        if (kvmppc_set_fwnmi() < 0) {
+            error_report("Could not enable fwnmi capability");
+            exit(1);
We have uniform failure handling for the cap_apply functions so you
shouldn't roll your own.  Simply error_setg() on the supplied errp,
and the generic caps code will handle exiting out.

Also, I think you should explicitly mention KVM in this message, to
make it clear that's where the problem is occurring.  From the user's
point of view they've just *set* the spapr fwnmi capability so this
won't help them figure out why it isn't working.
sure

Also, weren't you going to report a (non fatal) warning in the TCG
case, since TCG FWNMI behaviour doesn't precisely match true FWNMI
behaviour (though in a way that probably won't matter in practice).
ok

+        }
+    }
  }
SpaprCapabilityInfo capability_table[SPAPR_CAP_NUM] = {
diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
index 2c066a372d..3f162d82f5 100644
--- a/hw/ppc/spapr_rtas.c
+++ b/hw/ppc/spapr_rtas.c
@@ -400,6 +400,61 @@ static void rtas_get_power_level(PowerPCCPU *cpu, 
SpaprMachineState *spapr,
      rtas_st(rets, 1, 100);
  }
+static void rtas_ibm_nmi_register(PowerPCCPU *cpu,
+                                  SpaprMachineState *spapr,
+                                  uint32_t token, uint32_t nargs,
+                                  target_ulong args,
+                                  uint32_t nret, target_ulong rets)
+{
+    hwaddr rtas_addr;
+
+    if (spapr_get_cap(spapr, SPAPR_CAP_FWNMI_MCE) == SPAPR_CAP_OFF) {
+        rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
+        return;
+    }
+
+    rtas_addr = spapr_get_rtas_addr();
+    if (!rtas_addr) {
+        rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
+        return;
+    }
+
+    spapr->guest_machine_check_addr = rtas_ld(args, 1);
+    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
+}
+
+static void rtas_ibm_nmi_interlock(PowerPCCPU *cpu,
+                                   SpaprMachineState *spapr,
+                                   uint32_t token, uint32_t nargs,
+                                   target_ulong args,
+                                   uint32_t nret, target_ulong rets)
+{
+    if (spapr_get_cap(spapr, SPAPR_CAP_FWNMI_MCE) == SPAPR_CAP_OFF) {
+        rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
+        return;
+    }
+
+    if (spapr->guest_machine_check_addr == -1) {
+        /* NMI register not called */
+        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
+        return;
+    }
+
+    if (spapr->mc_status != cpu->vcpu_id) {
+        /* The vCPU that hit the NMI should invoke "ibm,nmi-interlock" */
+        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
+        return;
+    }
+
+    /*
+     * vCPU issuing "ibm,nmi-interlock" is done with NMI handling,
+     * hence unset mc_status.
+     */
+    spapr->mc_status = -1;
+    qemu_cond_signal(&spapr->mc_delivery_cond);
+    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
+}
+
  static struct rtas_call {
      const char *name;
      spapr_rtas_fn fn;
@@ -528,6 +583,10 @@ static void core_rtas_register_types(void)
                          rtas_set_power_level);
      spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level",
                          rtas_get_power_level);
+    spapr_rtas_register(RTAS_IBM_NMI_REGISTER, "ibm,nmi-register",
+                        rtas_ibm_nmi_register);
+    spapr_rtas_register(RTAS_IBM_NMI_INTERLOCK, "ibm,nmi-interlock",
+                        rtas_ibm_nmi_interlock);
  }
type_init(core_rtas_register_types)
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 652a5514e8..f6f82d88aa 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -656,8 +656,10 @@ target_ulong spapr_hypercall(PowerPCCPU *cpu, target_ulong 
opcode,
  #define RTAS_IBM_REMOVE_PE_DMA_WINDOW           (RTAS_TOKEN_BASE + 0x28)
  #define RTAS_IBM_RESET_PE_DMA_WINDOW            (RTAS_TOKEN_BASE + 0x29)
  #define RTAS_IBM_SUSPEND_ME                     (RTAS_TOKEN_BASE + 0x2A)
+#define RTAS_IBM_NMI_REGISTER                   (RTAS_TOKEN_BASE + 0x2B)
+#define RTAS_IBM_NMI_INTERLOCK                  (RTAS_TOKEN_BASE + 0x2C)
-#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2B)
+#define RTAS_TOKEN_MAX                          (RTAS_TOKEN_BASE + 0x2D)
/* RTAS ibm,get-system-parameter token values */
  #define RTAS_SYSPARM_SPLPAR_CHARACTERISTICS      20




reply via email to

[Prev in Thread] Current Thread [Next in Thread]