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KVM: x86: Allow CPU to force vendor-specific TDP level

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AMD future CPUs will require a 5-level NPT if host CR4.LA57 is set.
To prevent kvm_mmu_get_tdp_level() from incorrectly changing NPT level
on behalf of CPUs, add a new parameter in kvm_configure_mmu() to force
a fixed TDP level.

Signed-off-by: Wei Huang <wei.huang2@amd.com>
Message-Id: <20210818165549.3771014-2-wei.huang2@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wei Huang
2021-08-18 11:55:47 -05:00
committed by Paolo Bonzini
parent ec607a564f
commit 746700d21f
4 changed files with 15 additions and 7 deletions
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5
arch/x86/include/asm/kvm_host.h
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@@ -717,7 +717,6 @@ struct kvm_vcpu_arch {
u64 reserved_gpa_bits;
int maxphyaddr;
int max_tdp_level;
/* emulate context */
@@ -1766,8 +1765,8 @@ void kvm_mmu_invalidate_gva(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid);
void kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd);
void kvm_configure_mmu(bool enable_tdp, int tdp_max_root_level,
int tdp_huge_page_level);
void kvm_configure_mmu(bool enable_tdp, int tdp_forced_root_level,
int tdp_max_root_level, int tdp_huge_page_level);
static inline u16 kvm_read_ldt(void)
{