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Re: [Qemu-devel] [PATCH 2/9] kvm: add kvm_enable_cap_{vm,vcpu}


From: Alexander Graf
Subject: Re: [Qemu-devel] [PATCH 2/9] kvm: add kvm_enable_cap_{vm,vcpu}
Date: Wed, 16 Apr 2014 13:22:18 +0200
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.4.0


On 14.04.14 18:48, Cornelia Huck wrote:
Provide helper functions for enabling capabilities (on a vcpu and on a vm).

Reviewed-by: Thomas Huth <address@hidden>
Signed-off-by: Cornelia Huck <address@hidden>
---
  include/sysemu/kvm.h |    4 ++++
  kvm-all.c            |   33 ++++++++++++++++++++++++++++++++-
  2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index 0bee1e8..2ff5ad3 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -294,6 +294,10 @@ bool kvm_arch_stop_on_emulation_error(CPUState *cpu);
int kvm_check_extension(KVMState *s, unsigned int extension); +int kvm_enable_cap_vm(KVMState *s, unsigned int capability, ...);
+
+int kvm_enable_cap_vcpu(CPUState *cpu, unsigned int capability, ...);
+
  uint32_t kvm_arch_get_supported_cpuid(KVMState *env, uint32_t function,
                                        uint32_t index, int reg);
diff --git a/kvm-all.c b/kvm-all.c
index cd4111d..658e50c 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -501,7 +501,38 @@ int kvm_check_extension(KVMState *s, unsigned int 
extension)
      return ret;
  }
-static int kvm_set_ioeventfd_mmio(int fd, hwaddr addr, uint32_t val,
+int kvm_enable_cap_vm(KVMState *s, unsigned int capability, ...)
+{
+    struct kvm_enable_cap cap = {};
+    va_list ap;
+    int i;
+
+    cap.cap = capability;
+    va_start(ap, capability);
+    for (i = 0; i < 4; i++) {
+        cap.args[i] = va_arg(ap, uint64_t);

Is this legit? Can we just pull items off the stack without running beyond?


Alex

+    }
+    va_end(ap);
+    return kvm_vm_ioctl(s, KVM_ENABLE_CAP, &cap);
+}
+
+int kvm_enable_cap_vcpu(CPUState *cpu, unsigned int capability, ...)
+{
+    struct kvm_enable_cap cap = {};
+    va_list ap;
+    int i;
+
+    cap.cap = capability;
+    va_start(ap, capability);
+    for (i = 0; i < 4; i++) {
+        cap.args[i] = va_arg(ap, uint64_t);
+    }
+    va_end(ap);
+    return kvm_vcpu_ioctl(cpu, KVM_ENABLE_CAP, &cap);
+}
+
+
+static int kvm_set_ioeventfd_mmio(int fd, uint32_t addr, uint32_t val,
                                    bool assign, uint32_t size, bool datamatch)
  {
      int ret;




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