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hv: nested: Manage shadow EPTP according to guest VMCS change

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'struct nept_desc' is used to associate guest EPTP with a shadow EPTP.
It's created in the first reference and be freed while no reference.

The life cycle seems like,

While guest VMCS VMX_EPT_POINTER_FULL is changed, the 'struct nept_desc'
of the new guest EPTP is referenced; the 'struct nept_desc' of the old
guest EPTP is dereferenced.

While guest VMCS be cleared(by VMCLEAR in L1 VM), the 'struct nept_desc'
of the old guest EPTP is dereferenced.

While a new guest VMCS be loaded(by VMPTRLD in L1 VM), the 'struct
nept_desc' of the new guest EPTP is referenced. The 'struct nept_desc'
of the old guest EPTP is dereferenced.

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 14:18:27 +08:00
committed by Xie, Nanlin
parent 10ec896f99
commit 540a484147
3 changed files with 35 additions and 5 deletions
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1
hypervisor/include/arch/x86/asm/guest/vept.h
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@@ -31,6 +31,7 @@ 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);
bool handle_l2_ept_violation(struct acrn_vcpu *vcpu);
int32_t invept_vmexit_handler(struct acrn_vcpu *vcpu);
#else
static inline void reserve_buffer_for_sept_pages(void) {};