[PATCH 1/3] KVM: x86: Rename gb_page_enable() to get_lpage_level() in kvm_x86_ops

[Sheng Yang <sheng@xxxxxxxxxxxxxxx>]

Then the callback can provide the maximum supported large page level, which
is more flexible.

Also move the gb page support into x86_64 specific.

Signed-off-by: Sheng Yang <sheng@xxxxxxxxxxxxxxx>
---
 arch/x86/include/asm/kvm_host.h |    2 +-
 arch/x86/kvm/svm.c              |    6 +++---
 arch/x86/kvm/vmx.c              |    6 +++---
 arch/x86/kvm/x86.c              |    5 ++++-
 4 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index fe4df46..31b986f 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -520,7 +520,7 @@ struct kvm_x86_ops {
 	int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 	int (*get_tdp_level)(void);
 	u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
-	bool (*gb_page_enable)(void);
+	int (*get_lpage_level)(void);
 	bool (*rdtscp_supported)(void);
 
 	const struct trace_print_flags *exit_reasons_str;
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index b373ae6..c0153de 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2911,9 +2911,9 @@ static const struct trace_print_flags svm_exit_reasons_str[] = {
 	{ -1, NULL }
 };
 
-static bool svm_gb_page_enable(void)
+static int svm_get_lpage_level(void)
 {
-	return true;
+	return 3; /* PT_PDPE_LEVEL */
 }
 
 static bool svm_rdtscp_supported(void)
@@ -2986,7 +2986,7 @@ static struct kvm_x86_ops svm_x86_ops = {
 	.get_mt_mask = svm_get_mt_mask,
 
 	.exit_reasons_str = svm_exit_reasons_str,
-	.gb_page_enable = svm_gb_page_enable,
+	.get_lpage_level = svm_get_lpage_level,
 
 	.cpuid_update = svm_cpuid_update,
 
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2cc9b7e..c5b5ff6 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4011,9 +4011,9 @@ static const struct trace_print_flags vmx_exit_reasons_str[] = {
 	{ -1, NULL }
 };
 
-static bool vmx_gb_page_enable(void)
+static int vmx_get_lpage_level(void)
 {
-	return false;
+	return 2; /* PT_DIRECTORY_LEVEL */
 }
 
 static inline u32 bit(int bitno)
@@ -4106,7 +4106,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
 	.get_mt_mask = vmx_get_mt_mask,
 
 	.exit_reasons_str = vmx_exit_reasons_str,
-	.gb_page_enable = vmx_gb_page_enable,
+	.get_lpage_level = vmx_get_lpage_level,
 
 	.cpuid_update = vmx_cpuid_update,
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fd6e1a5..2968dd0 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1641,10 +1641,13 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 			 u32 index, int *nent, int maxnent)
 {
 	unsigned f_nx = is_efer_nx() ? F(NX) : 0;
-	unsigned f_gbpages = kvm_x86_ops->gb_page_enable() ? F(GBPAGES) : 0;
 #ifdef CONFIG_X86_64
+	/* PT_PDPE_LEVEL (mapping 1GB page) is 3 */
+	unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == 3) ?
+				F(GBPAGES) : 0;
 	unsigned f_lm = F(LM);
 #else
+	unsigned f_gbpages = 0;
 	unsigned f_lm = 0;
 #endif
 	unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0;
-- 
1.5.4.5

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