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| author | Wei Huang <wei.huang2@amd.com> | 2021-08-18 11:55:47 -0500 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-08-20 16:06:44 -0400 |
| commit | 746700d21fd52399c97aeb7791584bbf5426983c (patch) | |
| tree | 98eb6e95fd56c2dde9aba6d08efdbc3d7de365f4 /arch/x86/kvm/mmu/mmu.c | |
| parent | ec607a564f70519b340f7eb4cfc0f4a6b55285ac (diff) | |
| download | lwn-746700d21fd52399c97aeb7791584bbf5426983c.tar.gz lwn-746700d21fd52399c97aeb7791584bbf5426983c.zip | |
KVM: x86: Allow CPU to force vendor-specific TDP level
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>
Diffstat (limited to 'arch/x86/kvm/mmu/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu/mmu.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index bfd2705a7291..b2e68ce8b722 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -97,6 +97,7 @@ module_param_named(flush_on_reuse, force_flush_and_sync_on_reuse, bool, 0644); bool tdp_enabled = false; static int max_huge_page_level __read_mostly; +static int tdp_root_level __read_mostly; static int max_tdp_level __read_mostly; enum { @@ -4684,6 +4685,10 @@ static union kvm_mmu_role kvm_calc_mmu_role_common(struct kvm_vcpu *vcpu, static inline int kvm_mmu_get_tdp_level(struct kvm_vcpu *vcpu) { + /* tdp_root_level is architecture forced level, use it if nonzero */ + if (tdp_root_level) + return tdp_root_level; + /* Use 5-level TDP if and only if it's useful/necessary. */ if (max_tdp_level == 5 && cpuid_maxphyaddr(vcpu) <= 48) return 4; @@ -5375,10 +5380,11 @@ void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid) */ } -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) { tdp_enabled = enable_tdp; + tdp_root_level = tdp_forced_root_level; max_tdp_level = tdp_max_root_level; /* |