On 25 May 2018 at 12:06, Peter Maydell <peter.maydell@xxxxxxxxxx> wrote:
> On 23 May 2018 at 15:43, Michael S. Tsirkin <mst@xxxxxxxxxx> wrote:
>> Switch to the header we imported from Linux,
>> this allows us to drop a hack in kvm_i386.h.
>> More code will be dropped in the next patch.
>>
>> Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
>
>> --- a/target/i386/cpu.h
>> +++ b/target/i386/cpu.h
>> @@ -688,8 +688,6 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
>> #define CPUID_7_0_EDX_SPEC_CTRL (1U << 26) /* Speculation Control */
>> #define CPUID_7_0_EDX_SPEC_CTRL_SSBD (1U << 31) /* Speculative Store Bypass Disable */
>>
>> -#define KVM_HINTS_DEDICATED (1U << 0)
>> -
>> #define CPUID_8000_0008_EBX_IBPB (1U << 12) /* Indirect Branch Prediction Barrier */
>>
>> #define CPUID_XSAVE_XSAVEOPT (1U << 0)
>
> Hi -- this seems like it will break compilation when we next
> update our copy of the Linux kernel headers, because (as of
> 4.17-rc6, at least), asm-x86/kvm_para.h doesn't define
> KVM_HINTS_DEDICATED.
For the moment I'm using this workaround (I wanted to do a header
update for something else I'm working on):
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -48,6 +48,11 @@
#include "exec/memattrs.h"
#include "trace.h"
+/* Work around this kernel header constant changing its name */
+#ifndef KVM_HINTS_REALTIME
+#define KVM_HINTS_REALTIME KVM_HINTS_DEDICATED
+#endif
+
//#define DEBUG_KVM
#ifdef DEBUG_KVM
@@ -387,7 +392,7 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s,
uint32_t function,
ret &= ~(1U << KVM_FEATURE_PV_UNHALT);
}
} else if (function == KVM_CPUID_FEATURES && reg == R_EDX) {
- ret |= 1U << KVM_HINTS_DEDICATED;
+ ret |= 1U << KVM_HINTS_REALTIME;
found = 1;
}
thanks
-- PMM
