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[Qemu-devel] [PATCH 04/37] target-i386: Don't set any KVM flag by defaul
From: |
Andreas Färber |
Subject: |
[Qemu-devel] [PATCH 04/37] target-i386: Don't set any KVM flag by default if KVM is disabled |
Date: |
Mon, 28 Jan 2013 17:18:21 +0100 |
From: Eduardo Habkost <address@hidden>
This is a cleanup that tries to solve two small issues:
- We don't need a separate kvm_pv_eoi_features variable just to keep a
constant calculated at compile-time, and this style would require
adding a separate variable (that's declared twice because of the
CONFIG_KVM ifdef) for each feature that's going to be
enabled/disabled by machine-type compat code.
- The pc-1.3 code is setting the kvm_pv_eoi flag on cpuid_kvm_features
even when KVM is disabled at runtime. This small inconsistency in
the cpuid_kvm_features field isn't a problem today because
cpuid_kvm_features is ignored by the TCG code, but it may cause
unexpected problems later when refactoring the CPUID handling code.
This patch eliminates the kvm_pv_eoi_features variable and simply uses
kvm_enabled() inside the enable_kvm_pv_eoi() compat function, so it
enables kvm_pv_eoi only if KVM is enabled. I believe this makes the
behavior of enable_kvm_pv_eoi() clearer and easier to understand.
Signed-off-by: Eduardo Habkost <address@hidden>
Acked-by: Gleb Natapov <address@hidden>
Reviewed-by: Marcelo Tosatti <address@hidden>
Signed-off-by: Andreas Färber <address@hidden>
---
target-i386/cpu.c | 12 ++++--------
1 Datei geändert, 4 Zeilen hinzugefügt(+), 8 Zeilen entfernt(-)
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 376d4c8..ac2ec24 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -206,22 +206,16 @@ typedef struct model_features_t {
int check_cpuid = 0;
int enforce_cpuid = 0;
-#if defined(CONFIG_KVM)
static uint32_t kvm_default_features = (1 << KVM_FEATURE_CLOCKSOURCE) |
(1 << KVM_FEATURE_NOP_IO_DELAY) |
(1 << KVM_FEATURE_CLOCKSOURCE2) |
(1 << KVM_FEATURE_ASYNC_PF) |
(1 << KVM_FEATURE_STEAL_TIME) |
(1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
-static const uint32_t kvm_pv_eoi_features = (0x1 << KVM_FEATURE_PV_EOI);
-#else
-static uint32_t kvm_default_features = 0;
-static const uint32_t kvm_pv_eoi_features = 0;
-#endif
void enable_kvm_pv_eoi(void)
{
- kvm_default_features |= kvm_pv_eoi_features;
+ kvm_default_features |= (1UL << KVM_FEATURE_PV_EOI);
}
void host_cpuid(uint32_t function, uint32_t count,
@@ -1602,7 +1596,9 @@ int cpu_x86_register(X86CPU *cpu, const char *cpu_model)
goto out;
}
- def->kvm_features |= kvm_default_features;
+ if (kvm_enabled()) {
+ def->kvm_features |= kvm_default_features;
+ }
def->ext_features |= CPUID_EXT_HYPERVISOR;
if (cpu_x86_parse_featurestr(def, features) < 0) {
--
1.7.10.4
- [Qemu-devel] [PULL 00/37] QOM CPUState patch queue 2013-01-28, Andreas Färber, 2013/01/28
- [Qemu-devel] [PATCH 01/37] target-openrisc: Drop OpenRISCCPUList, Andreas Färber, 2013/01/28
- [Qemu-devel] [PATCH 06/37] kvm: Create kvm_arch_vcpu_id() function, Andreas Färber, 2013/01/28
- [Qemu-devel] [PATCH 04/37] target-i386: Don't set any KVM flag by default if KVM is disabled,
Andreas Färber <=
- [Qemu-devel] [PATCH 11/37] pc: Set fw_cfg data based on APIC ID calculation, Andreas Färber, 2013/01/28
- [Qemu-devel] [PATCH 05/37] pc: Reverse pc_init_pci() compatibility logic, Andreas Färber, 2013/01/28
- [Qemu-devel] [PATCH 09/37] fw_cfg: Remove FW_CFG_MAX_CPUS from fw_cfg_init(), Andreas Färber, 2013/01/28
- [Qemu-devel] [PATCH 03/37] kvm: Add fake KVM_FEATURE_CLOCKSOURCE_STABLE_BIT for builds without KVM, Andreas Färber, 2013/01/28
- [Qemu-devel] [PATCH 10/37] cpus.h: Make constant smp_cores/smp_threads available on *-user, Andreas Färber, 2013/01/28
- [Qemu-devel] [PATCH 07/37] target-i386: kvm: Set vcpu_id to APIC ID instead of CPU index, Andreas Färber, 2013/01/28
- [Qemu-devel] [PATCH 08/37] target-i386: Introduce x86_cpu_apic_id_from_index() function, Andreas Färber, 2013/01/28
- [Qemu-devel] [PATCH 02/37] target-openrisc: Clean up triple QOM casts, Andreas Färber, 2013/01/28
- [Qemu-devel] [PATCH 18/37] target-i386: Remove vendor_override field from CPUX86State, Andreas Färber, 2013/01/28
- [Qemu-devel] [PATCH 21/37] cpu: Add model resolution support to CPUClass, Andreas Färber, 2013/01/28