diff options
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index e24df01..2f7bc2d 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -23,7 +23,7 @@ #include "mmu.h" #include "trace.h" -static u32 xstate_required_size(u64 xstate_bv) +static u32 xstate_required_size(u64 xstate_bv, bool compacted) { int feature_bit = 0; u32 ret = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; @@ -31,9 +31,10 @@ static u32 xstate_required_size(u64 xstate_bv) xstate_bv &= XSTATE_EXTEND_MASK; while (xstate_bv) { if (xstate_bv & 0x1) { - u32 eax, ebx, ecx, edx; + u32 eax, ebx, ecx, edx, offset; cpuid_count(0xD, feature_bit, &eax, &ebx, &ecx, &edx); - ret = max(ret, eax + ebx); + offset = compacted ? ret : ebx; + ret = max(ret, offset + eax); } xstate_bv >>= 1; @@ -87,9 +88,13 @@ int kvm_update_cpuid(struct kvm_vcpu *vcpu) (best->eax | ((u64)best->edx << 32)) & kvm_supported_xcr0(); vcpu->arch.guest_xstate_size = best->ebx = - xstate_required_size(vcpu->arch.xcr0); + xstate_required_size(vcpu->arch.xcr0, false); } + best = kvm_find_cpuid_entry(vcpu, 0xD, 1); + if (best && (best->eax & (F(XSAVES) | F(XSAVEC)))) + best->ebx = xstate_required_size(vcpu->arch.xcr0, true); + /* * The existing code assumes virtual address is 48-bit in the canonical * address checks; exit if it is ever changed. @@ -470,9 +475,14 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, goto out; do_cpuid_1_ent(&entry[i], function, idx); - if (idx == 1) + if (idx == 1) { entry[i].eax &= kvm_supported_word10_x86_features; - else if (entry[i].eax == 0 || !(supported & mask)) + entry[i].ebx = 0; + if (entry[i].eax & (F(XSAVES)|F(XSAVEC))) + entry[i].ebx = + xstate_required_size(supported, + true); + } else if (entry[i].eax == 0 || !(supported & mask)) continue; entry[i].flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
