[PATCH v2 11/25] KVM: x86/mmu: remove kvm_calc_shadow_root_page_role_common

Paolo Bonzini
2022-02-21T16:23:17Z

kvm_calc_shadow_root_page_role_common is the same as
kvm_calc_cpu_mode except for the level, which is overwritten
afterwards in kvm_calc_shadow_mmu_root_page_role
and kvm_calc_shadow_npt_root_page_role.

role.base.direct is already set correctly for the CPU mode,
and CR0.PG=1 is required for VMRUN so it will also be
correct for nested NPT.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/mmu/mmu.c | 21 ++-------------------
1 file changed, 2 insertions(+), 19 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 3ffa6f2bf991..31874fad12fb 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4796,27 +4796,11 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu,
reset_tdp_shadow_zero_bits_mask(context);
}

-static union kvm_mmu_role
-kvm_calc_shadow_root_page_role_common(struct kvm_vcpu *vcpu,
- const struct kvm_mmu_role_regs *regs)
-{
- union kvm_mmu_role role = kvm_calc_mmu_role_common(vcpu, regs);
-
- role.base.smep_andnot_wp = role.ext.cr4_smep && !____is_cr0_wp(regs);
- role.base.smap_andnot_wp = role.ext.cr4_smap && !____is_cr0_wp(regs);
- role.base.has_4_byte_gpte = ____is_cr0_pg(regs) && !____is_cr4_pae(regs);
-
- return role;
-}
-
static union kvm_mmu_role
kvm_calc_shadow_mmu_root_page_role(struct kvm_vcpu *vcpu,
const struct kvm_mmu_role_regs *regs)
{
- union kvm_mmu_role role =
- kvm_calc_shadow_root_page_role_common(vcpu, regs);
-
- role.base.direct = !____is_cr0_pg(regs);
+ union kvm_mmu_role role = kvm_calc_cpu_mode(vcpu, regs);

if (!____is_efer_lma(regs))
role.base.level = PT32E_ROOT_LEVEL;
@@ -4869,9 +4853,8 @@ kvm_calc_shadow_npt_root_page_role(struct kvm_vcpu *vcpu,
const struct kvm_mmu_role_regs *regs)
{
union kvm_mmu_role role =
- kvm_calc_shadow_root_page_role_common(vcpu, regs);
+ kvm_calc_cpu_mode(vcpu, regs);

- role.base.direct = false;
role.base.level = kvm_mmu_get_tdp_level(vcpu);

return role;
--
2.31.1