[xen master] xen/arm64: Remove READ/WRITE_SYSREG32 helper macros

[patchbot@xxxxxxx]

commit 57e761b60dc92e210caf3429b8956d908ba04ae9
Author:     Michal Orzel <michal.orzel@xxxxxxx>
AuthorDate: Mon Jul 12 10:53:29 2021 +0200
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Tue Jul 20 13:00:23 2021 -0700

    xen/arm64: Remove READ/WRITE_SYSREG32 helper macros
    
    AArch64 system registers are 64bit whereas AArch32 ones
    are 32bit or 64bit. MSR/MRS are expecting 64bit values thus
    we should get rid of helpers READ/WRITE_SYSREG32
    in favour of using READ/WRITE_SYSREG.
    
    The last place in code making use of READ/WRITE_SYSREG32
    on arm64 is in TVM_REG macro defining functions vreg_emulate_<register>.
    Implement a macro WRITE_SYSREG_SZ which expands as follows:
    -on arm64: WRITE_SYSREG
    -on arm32: WRITE_SYSREG{32/64}
    
    As there are no other places in the code using these helpers
    on arm64 - remove them.
    
    Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
    Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
    Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/vcpreg.c               | 12 +++++++++++-
 xen/include/asm-arm/arm64/sysregs.h |  4 ----
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/xen/arch/arm/vcpreg.c b/xen/arch/arm/vcpreg.c
index f0cdcc8a54..e3ce56d875 100644
--- a/xen/arch/arm/vcpreg.c
+++ b/xen/arch/arm/vcpreg.c
@@ -47,6 +47,16 @@
  *
  */
 
+#ifdef CONFIG_ARM_64
+#define WRITE_SYSREG_SZ(sz, val, sysreg) WRITE_SYSREG((uint##sz##_t)val, 
sysreg)
+#else
+/*
+ * WRITE_SYSREG{32/64} on arm32 is defined as variadic macro which imposes
+ * on the below macro to be defined like that as well.
+ */
+#define WRITE_SYSREG_SZ(sz, val, sysreg...)  WRITE_SYSREG##sz(val, sysreg)
+#endif
+
 /* The name is passed from the upper macro to workaround macro expansion. */
 #define TVM_REG(sz, func, reg...)                                           \
 static bool func(struct cpu_user_regs *regs, uint##sz##_t *r, bool read)    \
@@ -55,7 +65,7 @@ static bool func(struct cpu_user_regs *regs, uint##sz##_t *r, 
bool read)    \
     bool cache_enabled = vcpu_has_cache_enabled(v);                         \
                                                                             \
     GUEST_BUG_ON(read);                                                     \
-    WRITE_SYSREG##sz(*r, reg);                                              \
+    WRITE_SYSREG_SZ(sz, *r, reg);                                           \
                                                                             \
     p2m_toggle_cache(v, cache_enabled);                                     \
                                                                             \
diff --git a/xen/include/asm-arm/arm64/sysregs.h 
b/xen/include/asm-arm/arm64/sysregs.h
index 077fd95fb7..795901e1ba 100644
--- a/xen/include/asm-arm/arm64/sysregs.h
+++ b/xen/include/asm-arm/arm64/sysregs.h
@@ -87,10 +87,6 @@
 
 /* Access to system registers */
 
-#define READ_SYSREG32(name) ((uint32_t)READ_SYSREG64(name))
-
-#define WRITE_SYSREG32(v, name) WRITE_SYSREG64((uint64_t)v, name)
-
 #define WRITE_SYSREG64(v, name) do {                    \
     uint64_t _r = v;                                    \
     asm volatile("msr "__stringify(name)", %0" : : "r" (_r));       \
--
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