diff options
| author | Avi Kivity <avi@redhat.com> | 2009-06-16 11:36:33 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-09-10 07:32:58 +0200 |
| commit | b3dbf89e676e47ef3b10802f9aba5a8e04aba132 (patch) | |
| tree | 22c22abc46306ab9d4d9f49f94a37da6a73685d1 /arch/x86/kvm/svm.c | |
| parent | KVM: VMX: Only reload guest cr2 if different from host cr2 (diff) | |
| download | linux-b3dbf89e676e47ef3b10802f9aba5a8e04aba132.tar.xz linux-b3dbf89e676e47ef3b10802f9aba5a8e04aba132.zip | |
KVM: SVM: Don't save/restore host cr2
The host never reads cr2 in process context, so are free to clobber it. The
vmx code does this, so we can safely remove the save/restore code.
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm.c | 17 |
1 files changed, 0 insertions, 17 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 060aa9f5571e..132be0c7c3eb 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -81,7 +81,6 @@ struct vcpu_svm { u64 host_user_msrs[NR_HOST_SAVE_USER_MSRS]; u64 host_gs_base; - unsigned long host_cr2; u32 *msrpm; struct vmcb *hsave; @@ -186,19 +185,6 @@ static inline void invlpga(unsigned long addr, u32 asid) asm volatile (__ex(SVM_INVLPGA) :: "a"(addr), "c"(asid)); } -static inline unsigned long kvm_read_cr2(void) -{ - unsigned long cr2; - - asm volatile ("mov %%cr2, %0" : "=r" (cr2)); - return cr2; -} - -static inline void kvm_write_cr2(unsigned long val) -{ - asm volatile ("mov %0, %%cr2" :: "r" (val)); -} - static inline void force_new_asid(struct kvm_vcpu *vcpu) { to_svm(vcpu)->asid_generation--; @@ -2527,7 +2513,6 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) fs_selector = kvm_read_fs(); gs_selector = kvm_read_gs(); ldt_selector = kvm_read_ldt(); - svm->host_cr2 = kvm_read_cr2(); if (!is_nested(svm)) svm->vmcb->save.cr2 = vcpu->arch.cr2; /* required for live migration with NPT */ @@ -2614,8 +2599,6 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) vcpu->arch.regs[VCPU_REGS_RSP] = svm->vmcb->save.rsp; vcpu->arch.regs[VCPU_REGS_RIP] = svm->vmcb->save.rip; - kvm_write_cr2(svm->host_cr2); - kvm_load_fs(fs_selector); kvm_load_gs(gs_selector); kvm_load_ldt(ldt_selector); |