[PATCH 4/9] KVM: MMU: split reset_rsvds_bits_mask

[Xiao Guangrong]

Since softmmu & AMD nested shadow page tables and guest page tables have
the same format, split reset_rsvds_bits_mask so that the logic can be
reused by later patches which check reserved bits on sptes

Signed-off-by: Xiao Guangrong <guangrong.x...@linux.intel.com>
---
 arch/x86/kvm/mmu.c | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 23633f5..693d565 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3568,20 +3568,21 @@ static bool is_rsvd_bits_set(struct kvm_mmu *mmu, u64 
gpte, int level)
 #include "paging_tmpl.h"
 #undef PTTYPE
 
-static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
-                                 struct kvm_mmu *context)
+static void
+__reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
+                       struct rsvd_bits_validate *rsvd_check,
+                       int maxphyaddr, int level, bool nx, bool gbpages,
+                       bool pse)
 {
-       struct rsvd_bits_validate *rsvd_check = &context->guest_rsvd_check;
-       int maxphyaddr = cpuid_maxphyaddr(vcpu);
        u64 exb_bit_rsvd = 0;
        u64 gbpages_bit_rsvd = 0;
        u64 nonleaf_bit8_rsvd = 0;
 
        rsvd_check->bad_mt_xwr = 0;
 
-       if (!context->nx)
+       if (!nx)
                exb_bit_rsvd = rsvd_bits(63, 63);
-       if (!guest_cpuid_has_gbpages(vcpu))
+       if (!gbpages)
                gbpages_bit_rsvd = rsvd_bits(7, 7);
 
        /*
@@ -3591,7 +3592,7 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
        if (guest_cpuid_is_amd(vcpu))
                nonleaf_bit8_rsvd = rsvd_bits(8, 8);
 
-       switch (context->root_level) {
+       switch (level) {
        case PT32_ROOT_LEVEL:
                /* no rsvd bits for 2 level 4K page table entries */
                rsvd_check->rsvd_bits_mask[0][1] = 0;
@@ -3599,7 +3600,7 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
                rsvd_check->rsvd_bits_mask[1][0] =
                        rsvd_check->rsvd_bits_mask[0][0];
 
-               if (!is_pse(vcpu)) {
+               if (!pse) {
                        rsvd_check->rsvd_bits_mask[1][1] = 0;
                        break;
                }
@@ -3650,6 +3651,15 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
        }
 }
 
+static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
+                                 struct kvm_mmu *context)
+{
+       __reset_rsvds_bits_mask(vcpu, &context->guest_rsvd_check,
+                               cpuid_maxphyaddr(vcpu), context->root_level,
+                               context->nx, guest_cpuid_has_gbpages(vcpu),
+                               is_pse(vcpu));
+}
+
 static void reset_rsvds_bits_mask_ept(struct kvm_vcpu *vcpu,
                struct kvm_mmu *context, bool execonly)
 {
-- 
2.1.0

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