Differential D15138 Diff 41798 head/sys/amd64/vmm/vmm_host.c

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head/sys/amd64/vmm/vmm_host.c

Show First 20 Lines • Show All 55 Lines • ▼ Show 20 Lines	vmm_host_state_init(void)
* We always want CR0.TS to be set when the processor does a VM exit.		* We always want CR0.TS to be set when the processor does a VM exit.
*		*
* With emulation turned on unconditionally after a VM exit, we are		* With emulation turned on unconditionally after a VM exit, we are
* able to trap inadvertent use of the FPU until the guest FPU state		* able to trap inadvertent use of the FPU until the guest FPU state
* has been safely squirreled away.		* has been safely squirreled away.
*/		*/
vmm_host_cr0 = rcr0() \| CR0_TS;		vmm_host_cr0 = rcr0() \| CR0_TS;

vmm_host_cr4 = rcr4();		/*
		* On non-PCID or PCID but without INVPCID support machines,
		* we flush kernel i.e. global TLB entries, by temporary
		* clearing the CR4.PGE bit, see invltlb_glob(). If
		* preemption occurs at the wrong time, cached vmm_host_cr4
		* might store the value with CR4.PGE cleared. Since FreeBSD
		* requires support for PG_G on amd64, just set it
		* unconditionally.
		*/
		vmm_host_cr4 = rcr4() \| CR4_PGE;

/*		/*
* Only permit a guest to use XSAVE if the host is using		* Only permit a guest to use XSAVE if the host is using
* XSAVE. Only permit a guest to use XSAVE features supported		* XSAVE. Only permit a guest to use XSAVE features supported
* by the host. This ensures that the FPU state used by the		* by the host. This ensures that the FPU state used by the
* guest is always a subset of the saved guest FPU state.		* guest is always a subset of the saved guest FPU state.
*		*
* In addition, only permit known XSAVE features where the		* In addition, only permit known XSAVE features where the
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