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[Qemu-devel] [PULL 13/48] i386/kvm: add support for Hyper-V IPI send
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PULL 13/48] i386/kvm: add support for Hyper-V IPI send |
Date: |
Thu, 18 Oct 2018 22:31:40 +0200 |
From: Vitaly Kuznetsov <address@hidden>
Hyper-V PV IPI support is merged to KVM, enable the feature in Qemu. When
enabled, this allows Windows guests to send IPIs to other vCPUs with a
single hypercall even when there are >64 vCPUs in the request.
Signed-off-by: Vitaly Kuznetsov <address@hidden>
Reviewed-by: Roman Kagan <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
target/i386/cpu.c | 1 +
target/i386/cpu.h | 1 +
target/i386/hyperv-proto.h | 1 +
target/i386/kvm.c | 14 +++++++++++++-
4 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index c88876d..32ea041 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -5564,6 +5564,7 @@ static Property x86_cpu_properties[] = {
DEFINE_PROP_BOOL("hv-frequencies", X86CPU, hyperv_frequencies, false),
DEFINE_PROP_BOOL("hv-reenlightenment", X86CPU, hyperv_reenlightenment,
false),
DEFINE_PROP_BOOL("hv-tlbflush", X86CPU, hyperv_tlbflush, false),
+ DEFINE_PROP_BOOL("hv-ipi", X86CPU, hyperv_ipi, false),
DEFINE_PROP_BOOL("check", X86CPU, check_cpuid, true),
DEFINE_PROP_BOOL("enforce", X86CPU, enforce_cpuid, false),
DEFINE_PROP_BOOL("kvm", X86CPU, expose_kvm, true),
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 730c06f..caa1544 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1382,6 +1382,7 @@ struct X86CPU {
bool hyperv_frequencies;
bool hyperv_reenlightenment;
bool hyperv_tlbflush;
+ bool hyperv_ipi;
bool check_cpuid;
bool enforce_cpuid;
bool expose_kvm;
diff --git a/target/i386/hyperv-proto.h b/target/i386/hyperv-proto.h
index d6d5a79..87f36d1 100644
--- a/target/i386/hyperv-proto.h
+++ b/target/i386/hyperv-proto.h
@@ -58,6 +58,7 @@
#define HV_APIC_ACCESS_RECOMMENDED (1u << 3)
#define HV_SYSTEM_RESET_RECOMMENDED (1u << 4)
#define HV_RELAXED_TIMING_RECOMMENDED (1u << 5)
+#define HV_CLUSTER_IPI_RECOMMENDED (1u << 10)
#define HV_EX_PROCESSOR_MASKS_RECOMMENDED (1u << 11)
/*
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index 302f420..4e62b5c 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -608,7 +608,8 @@ static bool hyperv_enabled(X86CPU *cpu)
cpu->hyperv_synic ||
cpu->hyperv_stimer ||
cpu->hyperv_reenlightenment ||
- cpu->hyperv_tlbflush);
+ cpu->hyperv_tlbflush ||
+ cpu->hyperv_ipi);
}
static int kvm_arch_set_tsc_khz(CPUState *cs)
@@ -888,6 +889,17 @@ int kvm_arch_init_vcpu(CPUState *cs)
c->eax |= HV_REMOTE_TLB_FLUSH_RECOMMENDED;
c->eax |= HV_EX_PROCESSOR_MASKS_RECOMMENDED;
}
+ if (cpu->hyperv_ipi) {
+ if (kvm_check_extension(cs->kvm_state,
+ KVM_CAP_HYPERV_SEND_IPI) <= 0) {
+ fprintf(stderr, "Hyper-V IPI send support "
+ "(requested by 'hv-ipi' cpu flag) "
+ " is not supported by kernel\n");
+ return -ENOSYS;
+ }
+ c->eax |= HV_CLUSTER_IPI_RECOMMENDED;
+ c->eax |= HV_EX_PROCESSOR_MASKS_RECOMMENDED;
+ }
c->ebx = cpu->hyperv_spinlock_attempts;
--
1.8.3.1
- [Qemu-devel] [PULL 02/48] Revert some patches from recent [PATCH v6] "Fixing record/replay and adding reverse debugging", (continued)
- [Qemu-devel] [PULL 02/48] Revert some patches from recent [PATCH v6] "Fixing record/replay and adding reverse debugging", Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 04/48] qemu-timer: avoid checkpoints for virtual clock timers in external subsystems, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 03/48] qemu-timer: introduce timer attributes, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 09/48] target-i386: add rtc 0x70 port as coalesced_pio, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 01/48] es1370: more fixes for ADC_FRAMEADR and ADC_FRAMECNT, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 06/48] target-i386: kvm: do not initialize padding fields, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 12/48] replay: don't process events at virtual clock checkpoint, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 07/48] linux-headers: update to 4.20-rc1, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 08/48] target-i386 : add coalesced_pio API, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 11/48] target-i386: add q35 0xcf8 port as coalesced_pio, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 13/48] i386/kvm: add support for Hyper-V IPI send,
Paolo Bonzini <=
- [Qemu-devel] [PULL 16/48] vl: improve/fix documentation related to RTC function, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 18/48] Fixes RTC bug with base datetime shifts in clock=vm, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 19/48] vl, qapi: offset calculation in RTC_CHANGE event reverted, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 20/48] call HotplugHandler->plug() as the last step in device realization, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 21/48] hw: edu: drop DO_UPCAST, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 25/48] hyperv_testdev: drop unnecessary includes, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 10/48] target-i386: add i440fx 0xcf8 port as coalesced_pio, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 17/48] vl: refactor -rtc option references, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 15/48] i386: hvf: Remove hvf_disabled, Paolo Bonzini, 2018/10/18
- [Qemu-devel] [PULL 14/48] i386: hvf: Fix register refs if REX is present, Paolo Bonzini, 2018/10/18