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Save KGSBASE in pcb before overriding it with the guest value.

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Reported by:	lwhsu, mjoras
Discussed with:	jhb
Sponsored by:	The FreeBSD Foundation
MFC after:	18 days
This commit is contained in:
kib 2017-08-24 10:49:53 +00:00
parent 8e8b325625
commit dd1b856d37
1 changed files with 4 additions and 1 deletions
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5
sys/amd64/vmm/intel/vmx_msr.c
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@ -31,10 +31,12 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <machine/clock.h>
#include <machine/cpufunc.h>
#include <machine/md_var.h>
#include <machine/pcb.h>
#include <machine/specialreg.h>
#include <machine/vmm.h>
@ -356,7 +358,8 @@ vmx_msr_guest_enter(struct vmx *vmx, int vcpuid)
{
uint64_t *guest_msrs = vmx->guest_msrs[vcpuid];
/* Save host MSRs (if any) and restore guest MSRs */
/* Save host MSRs (in particular, KGSBASE) and restore guest MSRs */
update_pcb_bases(curpcb);
wrmsr(MSR_LSTAR, guest_msrs[IDX_MSR_LSTAR]);
wrmsr(MSR_CSTAR, guest_msrs[IDX_MSR_CSTAR]);
wrmsr(MSR_STAR, guest_msrs[IDX_MSR_STAR]);