Arun Sharma
2005-Jul-12 23:39 UTC
[Xen-devel] [PATCH] Need to save and restore MSRs for VMX domains across context switches.
Need to save and restore MSRs for VMX domains across context switches. Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Arun Sharma <arun.sharma@intel.com> diff -r ea18bec15d36 -r f63f9aa5fff7 xen/arch/x86/domain.c --- a/xen/arch/x86/domain.c Tue Jul 12 19:40:36 2005 +++ b/xen/arch/x86/domain.c Tue Jul 12 23:26:43 2005 @@ -640,9 +640,21 @@ } } +static inline void vmx_save_segments(struct vcpu *v) +{ + struct msr_state *guest_state; + + guest_state = &v->arch.arch_vmx.msr_content; + rdmsrl(MSR_SHADOW_GS_BASE, guest_state->shadow_gs); +} + static void save_segments(struct vcpu *v) { struct cpu_user_regs *regs = &v->arch.guest_context.user_regs; + + if (VMX_DOMAIN(v)) + vmx_save_segments(v); + __asm__ __volatile__ ( "movl %%ds,%0" : "=m" (regs->ds) ); __asm__ __volatile__ ( "movl %%es,%0" : "=m" (regs->es) ); __asm__ __volatile__ ( "movl %%fs,%0" : "=m" (regs->fs) ); @@ -796,6 +808,8 @@ load_LDT(next); load_segments(realprev, next); load_msrs(realprev, next); + } else { + vmx_restore_msrs(next); } } _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel