[RFC PATCH v1 07/15] x86/msr: Remove pmu_msr_{read,write}()

["Xin Li (Intel)" <xin@xxxxxxxxx>]

Now pmu_msr_{read,write}() just do pmu_msr_chk_emulated(), so remove
them and call pmu_msr_chk_emulated() directly.

Suggested-by: H. Peter Anvin (Intel) <hpa@xxxxxxxxx>
Signed-off-by: Xin Li (Intel) <xin@xxxxxxxxx>
---
 arch/x86/xen/enlighten_pv.c | 17 ++++++++++-------
 arch/x86/xen/pmu.c          | 24 ++++--------------------
 arch/x86/xen/xen-ops.h      |  3 +--
 3 files changed, 15 insertions(+), 29 deletions(-)

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 7401cce19939..a047dadf4511 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1090,8 +1090,9 @@ static void xen_write_cr4(unsigned long cr4)
 static u64 xen_do_read_msr(unsigned int msr, int *err)
 {
        u64 val = 0;    /* Avoid uninitialized value for safe variant. */
+       bool emulated;
 
-       if (pmu_msr_read(msr, &val, err))
+       if (pmu_msr_chk_emulated(msr, &val, true, &emulated) && emulated)
                return val;
 
        if (err)
@@ -1134,6 +1135,7 @@ static void xen_do_write_msr(unsigned int msr, unsigned 
int low,
                             unsigned int high, int *err)
 {
        u64 val;
+       bool emulated;
 
        switch (msr) {
        case MSR_FS_BASE:
@@ -1163,12 +1165,13 @@ static void xen_do_write_msr(unsigned int msr, unsigned 
int low,
        default:
                val = (u64)high << 32 | low;
 
-               if (!pmu_msr_write(msr, val)) {
-                       if (err)
-                               *err = native_write_msr_safe(msr, val);
-                       else
-                               native_write_msr(msr, val);
-               }
+               if (pmu_msr_chk_emulated(msr, &val, false, &emulated) && 
emulated)
+                       return;
+
+               if (err)
+                       *err = native_write_msr_safe(msr, val);
+               else
+                       native_write_msr(msr, val);
        }
 }
 
diff --git a/arch/x86/xen/pmu.c b/arch/x86/xen/pmu.c
index 1364cd3fb3ef..4d20503430dd 100644
--- a/arch/x86/xen/pmu.c
+++ b/arch/x86/xen/pmu.c
@@ -128,7 +128,7 @@ static inline uint32_t get_fam15h_addr(u32 addr)
        return addr;
 }
 
-static inline bool is_amd_pmu_msr(unsigned int msr)
+static bool is_amd_pmu_msr(u32 msr)
 {
        if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
            boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
@@ -194,8 +194,7 @@ static bool is_intel_pmu_msr(u32 msr_index, int *type, int 
*index)
        }
 }
 
-static bool xen_intel_pmu_emulate(unsigned int msr, u64 *val, int type,
-                                 int index, bool is_read)
+static bool xen_intel_pmu_emulate(u32 msr, u64 *val, int type, int index, bool 
is_read)
 {
        uint64_t *reg = NULL;
        struct xen_pmu_intel_ctxt *ctxt;
@@ -257,7 +256,7 @@ static bool xen_intel_pmu_emulate(unsigned int msr, u64 
*val, int type,
        return false;
 }
 
-static bool xen_amd_pmu_emulate(unsigned int msr, u64 *val, bool is_read)
+static bool xen_amd_pmu_emulate(u32 msr, u64 *val, bool is_read)
 {
        uint64_t *reg = NULL;
        int i, off = 0;
@@ -298,8 +297,7 @@ static bool xen_amd_pmu_emulate(unsigned int msr, u64 *val, 
bool is_read)
        return false;
 }
 
-static bool pmu_msr_chk_emulated(unsigned int msr, uint64_t *val, bool is_read,
-                                bool *emul)
+bool pmu_msr_chk_emulated(u32 msr, u64 *val, bool is_read, bool *emul)
 {
        int type, index = 0;
 
@@ -313,20 +311,6 @@ static bool pmu_msr_chk_emulated(unsigned int msr, 
uint64_t *val, bool is_read,
        return true;
 }
 
-bool pmu_msr_read(u32 msr, u64 *val, int *err)
-{
-       bool emulated;
-
-       return pmu_msr_chk_emulated(msr, val, true, &emulated) && emulated;
-}
-
-bool pmu_msr_write(u32 msr, u64 val)
-{
-       bool emulated;
-
-       return pmu_msr_chk_emulated(msr, &val, false, &emulated) && emulated;
-}
-
 static unsigned long long xen_amd_read_pmc(int counter)
 {
        struct xen_pmu_amd_ctxt *ctxt;
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 4a0a1d73d8b8..6545661010ce 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -274,8 +274,7 @@ void xen_pmu_finish(int cpu);
 static inline void xen_pmu_init(int cpu) {}
 static inline void xen_pmu_finish(int cpu) {}
 #endif
-bool pmu_msr_read(u32 msr, u64 *val, int *err);
-bool pmu_msr_write(u32 msr, u64 val);
+bool pmu_msr_chk_emulated(u32 msr, u64 *val, bool is_read, bool *emul);
 int pmu_apic_update(uint32_t reg);
 unsigned long long xen_read_pmc(int counter);
 
-- 
2.49.0