diff mbox series

[v2,4/6] kvm/i386: Avoid multiple calls to check_extension(KVM_CAP_HYPERV)

Message ID c11046833369b3bc006ce4fb95d9657b2d7dbad4.1624615713.git.sidcha@amazon.de (mailing list archive)
State New, archived
Headers show
Series Handle hypercall code overlay page in userspace | expand

Commit Message

Siddharth Chandrasekaran June 25, 2021, 10:23 a.m. UTC 
KVM_CAP_HYPERV is a VM ioctl and can be cached at kvm_arch_init()
instead of performing an ioctl each time in hyperv_enabled() which is
called foreach vCPU. Apart from that, this variable will come in handy
in a subsequent patch.

Signed-off-by: Siddharth Chandrasekaran <sidcha@amazon.de>
---
 target/i386/kvm/kvm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 03202bd06b..bcf1b4f2d0 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -93,6 +93,7 @@  static bool has_msr_misc_enable;
 static bool has_msr_smbase;
 static bool has_msr_bndcfgs;
 static int lm_capable_kernel;
+static bool has_hyperv;
 static bool has_msr_hv_hypercall;
 static bool has_msr_hv_crash;
 static bool has_msr_hv_reset;
@@ -716,7 +717,7 @@  unsigned long kvm_arch_vcpu_id(CPUState *cs)
 
 static bool hyperv_enabled(X86CPU *cpu)
 {
-    return kvm_check_extension(kvm_state, KVM_CAP_HYPERV) > 0 &&
+    return has_hyperv &&
         ((cpu->hyperv_spinlock_attempts != HYPERV_SPINLOCK_NEVER_NOTIFY) ||
          cpu->hyperv_features || cpu->hyperv_passthrough);
 }
@@ -2216,6 +2217,7 @@  int kvm_arch_init(MachineState *ms, KVMState *s)
     has_xsave = kvm_check_extension(s, KVM_CAP_XSAVE);
     has_xcrs = kvm_check_extension(s, KVM_CAP_XCRS);
     has_pit_state2 = kvm_check_extension(s, KVM_CAP_PIT_STATE2);
+    has_hyperv = kvm_check_extension(s, KVM_CAP_HYPERV);
 
     hv_vpindex_settable = kvm_check_extension(s, KVM_CAP_HYPERV_VP_INDEX);