KVM: VMX: Fold ept_update_paging_mode_cr0() back into vmx_set_cr0()

stable inclusion
from stable-v5.10.190
commit 7fc51da40b9d14491d90f21fc2ac769241b6840b
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I928UI

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=7fc51da40b9d14491d90f21fc2ac769241b6840b



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[ Upstream commit c834fd7f ]

Move the CR0/CR3/CR4 shenanigans for EPT without unrestricted guest back
into vmx_set_cr0().  This will allow a future patch to eliminate the
rather gross stuffing of vcpu->arch.cr0 in the paging transition cases
by snapshotting the old CR0.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210713163324.627647-24-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Stable-dep-of: c4abd735 ("KVM: VMX: Don't fudge CR0 and CR4 for restricted L2 guest")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>