From baa7e81e325bbb6ddebd7680ac1068859244b61d Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Tue, 21 Aug 2012 17:06:58 +0300 Subject: [PATCH] KVM: VMX: Separate saving pre-realmode state from setting segments Commit b246dd5df139 ("KVM: VMX: Fix KVM_SET_SREGS with big real mode segments") moved fix_rmode_seg() to vmx_set_segment(), so that it is applied not just on transitions to real mode, but also on KVM_SET_SREGS (migration). However fix_rmode_seg() not only munges the vmcs segments, it also sets up the save area for us to restore when returning to protected mode or to return in vmx_get_segment(). Move saving the segment into a new function, save_rmode_seg(), and call it just during the transition. Signed-off-by: Avi Kivity Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/vmx.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 13e0296cea46..4e49caf9224d 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2768,7 +2768,7 @@ static gva_t rmode_tss_base(struct kvm *kvm) return kvm->arch.tss_addr; } -static void fix_rmode_seg(int seg, struct kvm_save_segment *save) +static void save_rmode_seg(int seg, struct kvm_save_segment *save) { struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; @@ -2776,6 +2776,12 @@ static void fix_rmode_seg(int seg, struct kvm_save_segment *save) save->base = vmcs_readl(sf->base); save->limit = vmcs_read32(sf->limit); save->ar = vmcs_read32(sf->ar_bytes); +} + +static void fix_rmode_seg(int seg, struct kvm_save_segment *save) +{ + struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; + vmcs_write16(sf->selector, save->base >> 4); vmcs_write32(sf->base, save->base & 0xffff0); vmcs_write32(sf->limit, 0xffff); @@ -2798,6 +2804,12 @@ static void enter_rmode(struct kvm_vcpu *vcpu) vmx->emulation_required = 1; vmx->rmode.vm86_active = 1; + save_rmode_seg(VCPU_SREG_TR, &vmx->rmode.tr); + save_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es); + save_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds); + save_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs); + save_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs); + /* * Very old userspace does not call KVM_SET_TSS_ADDR before entering * vcpu. Call it here with phys address pointing 16M below 4G. @@ -2812,14 +2824,8 @@ static void enter_rmode(struct kvm_vcpu *vcpu) vmx_segment_cache_clear(vmx); - vmx->rmode.tr.selector = vmcs_read16(GUEST_TR_SELECTOR); - vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE); vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm)); - - vmx->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT); vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1); - - vmx->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES); vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); flags = vmcs_readl(GUEST_RFLAGS); -- 2.30.2