From 94554367a02e21be52d85147b7190cad036ebd31 Mon Sep 17 00:00:00 2001 From: grehan Date: Fri, 25 Jan 2013 21:38:31 +0000 Subject: Always allow access to the sysenter cs/esp/eip MSRs since they are automatically saved and restored in the VMCS. Reviewed by: neel Obtained from: NetApp --- sys/amd64/vmm/intel/vmx.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'sys/amd64') diff --git a/sys/amd64/vmm/intel/vmx.c b/sys/amd64/vmm/intel/vmx.c index 4f267bb..287ac8c 100644 --- a/sys/amd64/vmm/intel/vmx.c +++ b/sys/amd64/vmm/intel/vmx.c @@ -696,6 +696,10 @@ vmx_vminit(struct vm *vm) * vm-exit and vm-entry respectively. The host FSBASE and GSBASE are * always restored from the vmcs host state area on vm-exit. * + * The SYSENTER_CS/ESP/EIP MSRs are identical to FS/GSBASE in + * how they are saved/restored so can be directly accessed by the + * guest. + * * Guest KGSBASE is saved and restored in the guest MSR save area. * Host KGSBASE is restored before returning to userland from the pcb. * There will be a window of time when we are executing in the host @@ -708,6 +712,9 @@ vmx_vminit(struct vm *vm) */ if (guest_msr_rw(vmx, MSR_GSBASE) || guest_msr_rw(vmx, MSR_FSBASE) || + guest_msr_rw(vmx, MSR_SYSENTER_CS_MSR) || + guest_msr_rw(vmx, MSR_SYSENTER_ESP_MSR) || + guest_msr_rw(vmx, MSR_SYSENTER_EIP_MSR) || guest_msr_rw(vmx, MSR_KGSBASE) || guest_msr_rw(vmx, MSR_EFER)) panic("vmx_vminit: error setting guest msr access"); -- cgit v1.1