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hv: set guest segment base to zero if VCPU does not start in real mode

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In non real mode, for segment registers other than CS, the guest segment
base should be zero, otherwise the guest's segmentation results in wrong
effective addresses.

Linux boots with the wrong segment registers (base address in hidden part),
because it happens that it assigns the segment registers before using any
of them, which effectively reloads the segment base addresses from GDT.
This commit is contained in:
Zide Chen 2018-07-13 11:27:30 -07:00 committed by lijinxia
parent b831120165
commit 8925eb5647
1 changed files with 11 additions and 6 deletions
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17
hypervisor/arch/x86/vmx.c
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@ -872,21 +872,26 @@ static void init_guest_state(struct vcpu *vcpu)
pr_dbg("VMX_GUEST_GS_ATTR: 0x%x ", value32);
/* Base */
value = 0UL;
if (vcpu_mode == CPU_MODE_REAL) {
value = es << 4;
} else {
value = 0UL;
}
field = VMX_GUEST_ES_BASE;
exec_vmwrite(field, es << 4);
exec_vmwrite(field, value);
pr_dbg("VMX_GUEST_ES_BASE: 0x%016llx ", value);
field = VMX_GUEST_SS_BASE;
exec_vmwrite(field, ss << 4);
exec_vmwrite(field, value);
pr_dbg("VMX_GUEST_SS_BASE: 0x%016llx ", value);
field = VMX_GUEST_DS_BASE;
exec_vmwrite(field, ds << 4);
exec_vmwrite(field, value);
pr_dbg("VMX_GUEST_DS_BASE: 0x%016llx ", value);
field = VMX_GUEST_FS_BASE;
exec_vmwrite(field, fs << 4);
exec_vmwrite(field, value);
pr_dbg("VMX_GUEST_FS_BASE: 0x%016llx ", value);
field = VMX_GUEST_GS_BASE;
exec_vmwrite(field, gs << 4);
exec_vmwrite(field, value);
pr_dbg("VMX_GUEST_GS_BASE: 0x%016llx ", value);
/***************************************************/