From 152d3f2f246ce3c2a0cf2fc6c2214663cd99aa83 Mon Sep 17 00:00:00 2001 From: Laurent Vivier Date: Thu, 23 Aug 2007 16:33:11 +0200 Subject: [PATCH] KVM: VMX: Split segments reload in vmx_load_host_state() vmx_load_host_state() bundles fs, gs, ldt, and tss reloading into one in the hope that it is infrequent. With smp guests, fs reloading is frequent due to fs being used by threads. Unbundle the reloads so reduce expensive gs reloads. Signed-off-by: Laurent Vivier Signed-off-by: Avi Kivity --- drivers/kvm/vmx.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index b40066854c..d63e82e5db 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -54,7 +54,8 @@ struct vcpu_vmx { struct { int loaded; u16 fs_sel, gs_sel, ldt_sel; - int fs_gs_ldt_reload_needed; + int gs_ldt_reload_needed; + int fs_reload_needed; }host_state; }; @@ -353,20 +354,21 @@ static void vmx_save_host_state(struct vcpu_vmx *vmx) * allow segment selectors with cpl > 0 or ti == 1. */ vmx->host_state.ldt_sel = read_ldt(); - vmx->host_state.fs_gs_ldt_reload_needed = vmx->host_state.ldt_sel; + vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel; vmx->host_state.fs_sel = read_fs(); - if (!(vmx->host_state.fs_sel & 7)) + if (!(vmx->host_state.fs_sel & 7)) { vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel); - else { + vmx->host_state.fs_reload_needed = 0; + } else { vmcs_write16(HOST_FS_SELECTOR, 0); - vmx->host_state.fs_gs_ldt_reload_needed = 1; + vmx->host_state.fs_reload_needed = 1; } vmx->host_state.gs_sel = read_gs(); if (!(vmx->host_state.gs_sel & 7)) vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel); else { vmcs_write16(HOST_GS_SELECTOR, 0); - vmx->host_state.fs_gs_ldt_reload_needed = 1; + vmx->host_state.gs_ldt_reload_needed = 1; } #ifdef CONFIG_X86_64 @@ -396,9 +398,10 @@ static void vmx_load_host_state(struct vcpu_vmx *vmx) return; vmx->host_state.loaded = 0; - if (vmx->host_state.fs_gs_ldt_reload_needed) { - load_ldt(vmx->host_state.ldt_sel); + if (vmx->host_state.fs_reload_needed) load_fs(vmx->host_state.fs_sel); + if (vmx->host_state.gs_ldt_reload_needed) { + load_ldt(vmx->host_state.ldt_sel); /* * If we have to reload gs, we must take care to * preserve our gs base. @@ -409,9 +412,8 @@ static void vmx_load_host_state(struct vcpu_vmx *vmx) wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE)); #endif local_irq_restore(flags); - - reload_tss(); } + reload_tss(); save_msrs(vmx->guest_msrs, vmx->save_nmsrs); load_msrs(vmx->host_msrs, vmx->save_nmsrs); if (msr_efer_need_save_restore(vmx)) -- 2.39.5