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hv: nested: Introduce shadow EPT infrastructure

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To shadow guest EPT, the hypervisor needs construct a shadow EPT for each
guest EPT. The key to associate a shadow EPT and a guest EPT is the EPTP
(EPT pointer). This patch provides following structure to do the association.

	struct nept_desc {
	       /*
	        * A shadow EPTP.
	        * The format is same with 'EPT pointer' in VMCS.
	        * Its PML4 address field is a HVA of the hypervisor.
	        */
	       uint64_t shadow_eptp;
	       /*
	        * An guest EPTP configured by L1 VM.
	        * The format is same with 'EPT pointer' in VMCS.
	        * Its PML4 address field is a GPA of the L1 VM.
	        */
	       uint64_t guest_eptp;
	       uint32_t ref_count;
	};

Due to lack of dynamic memory allocation of the hypervisor, a array
nept_bucket of type 'struct nept_desc' is introduced to store those
association information. A guest EPT might be shared between different
L2 vCPUs, so this patch provides several functions to handle the
reference of the structure.

Interface get_shadow_eptp() also is introduced. To find the shadow EPTP
of a specified guest EPTP.

Tracked-On: #5923
Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com>
Signed-off-by: Zide Chen <zide.chen@intel.com>
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Shuo A Liu
2021-05-27 13:34:55 +08:00
committed by Xie, Nanlin
parent 17bc7f08c9
commit 10ec896f99
2 changed files with 141 additions and 0 deletions
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22
hypervisor/include/arch/x86/asm/guest/vept.h
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@@ -7,8 +7,30 @@
#define VEPT_H
#ifdef CONFIG_NVMX_ENABLED
/*
* A descriptor to store info of nested EPT
*/
struct nept_desc {
/*
* A shadow EPTP.
* The format is same with 'EPT pointer' in VMCS.
* Its PML4 address field is a HVA of the hypervisor.
*/
uint64_t shadow_eptp;
/*
* An guest EPTP configured by L1 VM.
* The format is same with 'EPT pointer' in VMCS.
* Its PML4 address field is a GPA of the L1 VM.
*/
uint64_t guest_eptp;
uint32_t ref_count;
};
void reserve_buffer_for_sept_pages(void);
void init_vept(void);
uint64_t get_shadow_eptp(uint64_t guest_eptp);
struct nept_desc *get_nept_desc(uint64_t guest_eptp);
void put_nept_desc(uint64_t guest_eptp);
int32_t invept_vmexit_handler(struct acrn_vcpu *vcpu);
#else
static inline void reserve_buffer_for_sept_pages(void) {};