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From d47dcee27b473fd94b4afdb21433d735ff9e51cd Mon Sep 17 00:00:00 2001
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From: Suraj Jitindar Singh <sursingh@redhat.com>
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Date: Tue, 13 Feb 2018 04:12:29 +0100
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Subject: [PATCH 12/15] target/ppc/spapr: Add H-Call H_GET_CPU_CHARACTERISTICS
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RH-Author: Suraj Jitindar Singh <sursingh@redhat.com>
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Message-id: <1518495150-24134-9-git-send-email-sursingh@redhat.com>
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Patchwork-id: 78986
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O-Subject: [RHEL7.5 qemu-kvm-rhev PATCH 8/9] target/ppc/spapr: Add H-Call H_GET_CPU_CHARACTERISTICS
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Bugzilla: 1532050
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RH-Acked-by: David Gibson <dgibson@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
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The new H-Call H_GET_CPU_CHARACTERISTICS is used by the guest to query
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behaviours and available characteristics of the cpu.
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Implement the handler for this new H-Call which formulates its response
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based on the setting of the spapr_caps cap-cfpc, cap-sbbc and cap-ibs.
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Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
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Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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(cherry picked from commit c59704b254734182c3202e0c261589ea2ccf485e)
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Conflicts: none
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1532050
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Signed-off-by: Suraj Jitindar Singh <sursingh@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/ppc/spapr_hcall.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++
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include/hw/ppc/spapr.h | 1 +
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2 files changed, 59 insertions(+)
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diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
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index 217358d..21247cd 100644
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--- a/hw/ppc/spapr_hcall.c
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+++ b/hw/ppc/spapr_hcall.c
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@@ -1629,6 +1629,60 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
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return H_SUCCESS;
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}
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+static target_ulong h_get_cpu_characteristics(PowerPCCPU *cpu,
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+ sPAPRMachineState *spapr,
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+ target_ulong opcode,
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+ target_ulong *args)
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+{
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+ uint64_t characteristics = H_CPU_CHAR_HON_BRANCH_HINTS &
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+ ~H_CPU_CHAR_THR_RECONF_TRIG;
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+ uint64_t behaviour = H_CPU_BEHAV_FAVOUR_SECURITY;
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+ uint8_t safe_cache = spapr_get_cap(spapr, SPAPR_CAP_CFPC);
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+ uint8_t safe_bounds_check = spapr_get_cap(spapr, SPAPR_CAP_SBBC);
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+ uint8_t safe_indirect_branch = spapr_get_cap(spapr, SPAPR_CAP_IBS);
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+
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+ switch (safe_cache) {
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+ case SPAPR_CAP_WORKAROUND:
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+ characteristics |= H_CPU_CHAR_L1D_FLUSH_ORI30;
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+ characteristics |= H_CPU_CHAR_L1D_FLUSH_TRIG2;
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+ characteristics |= H_CPU_CHAR_L1D_THREAD_PRIV;
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+ behaviour |= H_CPU_BEHAV_L1D_FLUSH_PR;
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+ break;
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+ case SPAPR_CAP_FIXED:
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+ break;
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+ default: /* broken */
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+ assert(safe_cache == SPAPR_CAP_BROKEN);
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+ behaviour |= H_CPU_BEHAV_L1D_FLUSH_PR;
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+ break;
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+ }
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+
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+ switch (safe_bounds_check) {
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+ case SPAPR_CAP_WORKAROUND:
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+ characteristics |= H_CPU_CHAR_SPEC_BAR_ORI31;
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+ behaviour |= H_CPU_BEHAV_BNDS_CHK_SPEC_BAR;
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+ break;
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+ case SPAPR_CAP_FIXED:
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+ break;
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+ default: /* broken */
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+ assert(safe_bounds_check == SPAPR_CAP_BROKEN);
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+ behaviour |= H_CPU_BEHAV_BNDS_CHK_SPEC_BAR;
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+ break;
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+ }
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+
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+ switch (safe_indirect_branch) {
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+ case SPAPR_CAP_FIXED:
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+ characteristics |= H_CPU_CHAR_BCCTRL_SERIALISED;
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+ default: /* broken */
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+ assert(safe_indirect_branch == SPAPR_CAP_BROKEN);
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+ break;
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+ }
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+
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+ args[0] = characteristics;
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+ args[1] = behaviour;
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+
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+ return H_SUCCESS;
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+}
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+
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static spapr_hcall_fn papr_hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];
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static spapr_hcall_fn kvmppc_hypercall_table[KVMPPC_HCALL_MAX - KVMPPC_HCALL_BASE + 1];
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@@ -1708,6 +1762,10 @@ static void hypercall_register_types(void)
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spapr_register_hypercall(H_INVALIDATE_PID, h_invalidate_pid);
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spapr_register_hypercall(H_REGISTER_PROC_TBL, h_register_process_table);
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+ /* hcall-get-cpu-characteristics */
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+ spapr_register_hypercall(H_GET_CPU_CHARACTERISTICS,
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+ h_get_cpu_characteristics);
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+
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/* "debugger" hcalls (also used by SLOF). Note: We do -not- differenciate
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* here between the "CI" and the "CACHE" variants, they will use whatever
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* mapping attributes qemu is using. When using KVM, the kernel will
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diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
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index f7f01f3..375b2ba 100644
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--- a/include/hw/ppc/spapr.h
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+++ b/include/hw/ppc/spapr.h
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@@ -406,6 +406,7 @@ struct sPAPRMachineState {
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#define H_GET_HCA_INFO 0x1B8
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#define H_GET_PERF_COUNT 0x1BC
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#define H_MANAGE_TRACE 0x1C0
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+#define H_GET_CPU_CHARACTERISTICS 0x1C8
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#define H_FREE_LOGICAL_LAN_BUFFER 0x1D4
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#define H_QUERY_INT_STATE 0x1E4
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#define H_POLL_PENDING 0x1D8
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--
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1.8.3.1
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