Allocate XSAVE area for host and guest Intel PT configuration when Intel PT working in HOST_GUEST mode. Intel PT configuration state can be saved using XSAVES and restored by XRSTORS instruction.
Signed-off-by: Luwei Kang <[email protected]> --- arch/x86/kvm/vmx/vmx.c | 25 ++++++++++++++++++++++++- arch/x86/kvm/vmx/vmx.h | 3 +++ 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 4595230..4691665 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1033,6 +1033,7 @@ static void pt_guest_exit(struct vcpu_vmx *vmx) static int pt_init(struct vcpu_vmx *vmx) { + unsigned int eax, ebx, ecx, edx; u32 pt_state_sz = sizeof(struct pt_state) + sizeof(u64) * intel_pt_validate_hw_cap(PT_CAP_num_address_ranges) * 2; @@ -1044,13 +1045,35 @@ static int pt_init(struct vcpu_vmx *vmx) vmx->pt_desc->host_ctx = (struct pt_state *)(vmx->pt_desc + 1); vmx->pt_desc->guest_ctx = (void *)vmx->pt_desc->host_ctx + pt_state_sz; + cpuid_count(XSTATE_CPUID, 1, &eax, &ebx, &ecx, &edx); + if (ecx & XFEATURE_MASK_PT) { + vmx->pt_desc->host_xs = kmem_cache_zalloc(x86_fpu_cache, + GFP_KERNEL_ACCOUNT); + vmx->pt_desc->guest_xs = kmem_cache_zalloc(x86_fpu_cache, + GFP_KERNEL_ACCOUNT); + if (!vmx->pt_desc->host_xs || !vmx->pt_desc->guest_xs) { + if (vmx->pt_desc->host_xs) + kmem_cache_free(x86_fpu_cache, + vmx->pt_desc->host_xs); + if (vmx->pt_desc->guest_xs) + kmem_cache_free(x86_fpu_cache, + vmx->pt_desc->guest_xs); + } else + vmx->pt_desc->pt_xsave = true; + } + return 0; } static void pt_uninit(struct vcpu_vmx *vmx) { - if (pt_mode == PT_MODE_HOST_GUEST) + if (pt_mode == PT_MODE_HOST_GUEST) { kfree(vmx->pt_desc); + if (vmx->pt_desc->pt_xsave) { + kmem_cache_free(x86_fpu_cache, vmx->pt_desc->host_xs); + kmem_cache_free(x86_fpu_cache, vmx->pt_desc->guest_xs); + } + } } void vmx_prepare_switch_to_guest(struct kvm_vcpu *vcpu) diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index 283f69d..e103991 100644 --- a/arch/x86/kvm/vmx/vmx.h +++ b/arch/x86/kvm/vmx/vmx.h @@ -69,8 +69,11 @@ struct pt_desc { u64 ctl_bitmask; u32 addr_range; u32 caps[PT_CPUID_REGS_NUM * PT_CPUID_LEAVES]; + bool pt_xsave; struct pt_state *host_ctx; struct pt_state *guest_ctx; + struct fpu *host_xs; + struct fpu *guest_xs; }; /* -- 1.8.3.1
