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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
arch/x86
include/asm
kvm_host.h
kvm
mmu
mmu.c
svm
svm.c
vmx
vmx.c

5
arch/x86/include/asm/kvm_host.h
View File

@ -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)
{

10
arch/x86/kvm/mmu/mmu.c
View File

@ -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;
/*

4
arch/x86/kvm/svm/svm.c
View File

@ -1013,7 +1013,9 @@ static __init int svm_hardware_setup(void)
if (!boot_cpu_has(X86_FEATURE_NPT))
npt_enabled = false;
kvm_configure_mmu(npt_enabled, get_max_npt_level(), PG_LEVEL_1G);
/* Force VM NPT level equal to the host's max NPT level */
kvm_configure_mmu(npt_enabled, get_max_npt_level(),
get_max_npt_level(), PG_LEVEL_1G);
pr_info("kvm: Nested Paging %sabled\n", npt_enabled ? "en" : "dis");
/* Note, SEV setup consumes npt_enabled. */

3
arch/x86/kvm/vmx/vmx.c
View File

@ -7820,7 +7820,8 @@ static __init int hardware_setup(void)
ept_lpage_level = PG_LEVEL_2M;
else
ept_lpage_level = PG_LEVEL_4K;
kvm_configure_mmu(enable_ept, vmx_get_max_tdp_level(), ept_lpage_level);
kvm_configure_mmu(enable_ept, 0, vmx_get_max_tdp_level(),
ept_lpage_level);
/*
* Only enable PML when hardware supports PML feature, and both EPT