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Subject[PATCH v6 2/8] KVM: x86: Add a helper function for CPUID(0xD,n>=1) enumeration
Date
To make the code look clean, wrap CPUID(0xD,n>=1) enumeration
code in a helper function now.

Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
---
arch/x86/kvm/cpuid.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 4992e7c99588..29cbde7538a3 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -313,6 +313,50 @@ static int __do_cpuid_ent_emulated(struct kvm_cpuid_entry2 *entry,
return 0;
}

+static inline int __do_cpuid_dx_leaf(struct kvm_cpuid_entry2 *entry, int *nent,
+ int maxnent, u64 xss_mask, u64 xcr0_mask,
+ u32 eax_mask)
+{
+ int idx, i;
+ u64 mask;
+ u64 supported;
+
+ for (idx = 1, i = 1; idx < 64; ++idx) {
+ mask = ((u64)1 << idx);
+ if (*nent >= maxnent)
+ return -EINVAL;
+
+ do_cpuid_1_ent(&entry[i], 0xD, idx);
+ if (idx == 1) {
+ entry[i].eax &= eax_mask;
+ cpuid_mask(&entry[i].eax, CPUID_D_1_EAX);
+ supported = xcr0_mask | xss_mask;
+ entry[i].ebx = 0;
+ entry[i].edx = 0;
+ entry[i].ecx &= xss_mask;
+ if (entry[i].eax & (F(XSAVES) | F(XSAVEC))) {
+ entry[i].ebx =
+ xstate_required_size(supported,
+ true);
+ }
+ } else {
+ supported = (entry[i].ecx & 1) ? xss_mask :
+ xcr0_mask;
+ if (entry[i].eax == 0 || !(supported & mask))
+ continue;
+ entry[i].ecx &= 1;
+ entry[i].edx = 0;
+ if (entry[i].ecx)
+ entry[i].ebx = 0;
+ }
+ entry[i].flags |=
+ KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
+ ++*nent;
+ ++i;
+ }
+ return 0;
+}
+
static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
u32 index, int *nent, int maxnent)
{
--
2.17.2
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