On Thu, Jun 13, 2019 at 01:51:03PM -0700, Fenghua Yu wrote:
> It's a waste for the four X86_FEATURE_CQM_* features to occupy two
> pure feature bits words. To better utilize feature words, re-define
> word 11 to host scattered features and move the four X86_FEATURE_CQM_*
> features into word 11. More scattered features can be added in word 11
> in the future.
>
> KVM doesn't support resctrl now. So it's safe to move the
> X86_FEATURE_CQM_* features to scattered features word 11 for KVM.
>
> Signed-off-by: Fenghua Yu <[email protected]>
...
> diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
> index 9a327d5b6d1f..d78a61408243 100644
> --- a/arch/x86/kvm/cpuid.h
> +++ b/arch/x86/kvm/cpuid.h
> @@ -47,8 +47,6 @@ static const struct cpuid_reg reverse_cpuid[] = {
> [CPUID_8000_0001_ECX] = {0x80000001, 0, CPUID_ECX},
> [CPUID_7_0_EBX] = { 7, 0, CPUID_EBX},
> [CPUID_D_1_EAX] = { 0xd, 1, CPUID_EAX},
> - [CPUID_F_0_EDX] = { 0xf, 0, CPUID_EDX},
> - [CPUID_F_1_EDX] = { 0xf, 1, CPUID_EDX},
I think you're going to have to change those to:
[CPUID_LNX_4] = { 0, 0, 0},
[CPUID_7_1_EAX] = { 7, 1, CPUID_EAX },
instead of removing them because kvm is basically hardcoding the feature
words and then bitches when array elements in the middle get removed:
In file included from ./include/linux/export.h:45,
from ./include/linux/linkage.h:7,
from ./include/linux/preempt.h:10,
from ./include/linux/hardirq.h:5,
from ./include/linux/kvm_host.h:10,
from arch/x86/kvm/x86.c:22:
In function ‘x86_feature_cpuid’,
inlined from ‘guest_cpuid_get_register’ at arch/x86/kvm/cpuid.h:71:33,
inlined from ‘guest_cpuid_has’ at arch/x86/kvm/cpuid.h:100:8,
inlined from ‘kvm_get_msr_common’ at arch/x86/kvm/x86.c:2804:8:
./include/linux/compiler.h:345:38: error: call to ‘__compiletime_assert_62’
declared with attribute error: BUILD_BUG_ON failed: x86_leaf >=
ARRAY_SIZE(reverse_cpuid)
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^
./include/linux/compiler.h:326:4: note: in definition of macro
‘__compiletime_assert’
prefix ## suffix(); \
^~~~~~
./include/linux/compiler.h:345:2: note: in expansion of macro
‘_compiletime_assert’
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^~~~~~~~~~~~~~~~~~~
./include/linux/build_bug.h:39:37: note: in expansion of macro
‘compiletime_assert’
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~~~~~~~~~~~~~~~
./include/linux/build_bug.h:50:2: note: in expansion of macro ‘BUILD_BUG_ON_MSG’
BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
^~~~~~~~~~~~~~~~
arch/x86/kvm/cpuid.h:62:2: note: in expansion of macro ‘BUILD_BUG_ON’
BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid));
^~~~~~~~~~~~
./include/linux/compiler.h:345:38: error: call to ‘__compiletime_assert_63’
declared with attribute error: BUILD_BUG_ON failed:
reverse_cpuid[x86_leaf].function == 0
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^
./include/linux/compiler.h:326:4: note: in definition of macro
‘__compiletime_assert’
prefix ## suffix(); \
^~~~~~
./include/linux/compiler.h:345:2: note: in expansion of macro
‘_compiletime_assert’
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^~~~~~~~~~~~~~~~~~~
./include/linux/build_bug.h:39:37: note: in expansion of macro
‘compiletime_assert’
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~~~~~~~~~~~~~~~
./include/linux/build_bug.h:50:2: note: in expansion of macro ‘BUILD_BUG_ON_MSG’
BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
^~~~~~~~~~~~~~~~
arch/x86/kvm/cpuid.h:63:2: note: in expansion of macro ‘BUILD_BUG_ON’
BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0);
^~~~~~~~~~~~
make[2]: *** [scripts/Makefile.build:278: arch/x86/kvm/x86.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [scripts/Makefile.build:489: arch/x86/kvm] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:1071: arch/x86] Error 2
make: *** Waiting for unfinished jobs....
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
