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[Qemu-devel] [RFC v2 3/5] cputlb: Introduce TLB_BSWAP
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From: |
Richard Henderson |
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Subject: |
[Qemu-devel] [RFC v2 3/5] cputlb: Introduce TLB_BSWAP |
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Date: |
Wed, 18 Sep 2019 11:02:49 -0700 |
Handle bswap on ram directly in load/store_helper. This fixes a
bug with the previous implementation in that one cannot use the
I/O path for RAM.
Fixes: a26fc6f5152b47f1
Signed-off-by: Richard Henderson <address@hidden>
---
include/exec/cpu-all.h | 2 +
accel/tcg/cputlb.c | 105 +++++++++++++++++++++--------------------
2 files changed, 57 insertions(+), 50 deletions(-)
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index d2d443c4f9..3928edab9a 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -331,6 +331,8 @@ CPUArchState *cpu_copy(CPUArchState *env);
#define TLB_MMIO (1 << (TARGET_PAGE_BITS - 3))
/* Set if TLB entry contains a watchpoint. */
#define TLB_WATCHPOINT (1 << (TARGET_PAGE_BITS - 4))
+/* Set if TLB entry requires byte swap. */
+#define TLB_BSWAP (1 << (TARGET_PAGE_BITS - 5))
/* Use this mask to check interception with an alignment mask
* in a TCG backend.
diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
index b4a63d3928..7301f9e699 100644
--- a/accel/tcg/cputlb.c
+++ b/accel/tcg/cputlb.c
@@ -737,8 +737,7 @@ void tlb_set_page_with_attrs(CPUState *cpu, target_ulong
vaddr,
address |= TLB_INVALID_MASK;
}
if (attrs.byte_swap) {
- /* Force the access through the I/O slow path. */
- address |= TLB_MMIO;
+ address |= TLB_BSWAP;
}
if (!memory_region_is_ram(section->mr) &&
!memory_region_is_romd(section->mr)) {
@@ -901,10 +900,6 @@ static uint64_t io_readx(CPUArchState *env, CPUIOTLBEntry
*iotlbentry,
bool locked = false;
MemTxResult r;
- if (iotlbentry->attrs.byte_swap) {
- op ^= MO_BSWAP;
- }
-
section = iotlb_to_section(cpu, iotlbentry->addr, iotlbentry->attrs);
mr = section->mr;
mr_offset = (iotlbentry->addr & TARGET_PAGE_MASK) + addr;
@@ -947,10 +942,6 @@ static void io_writex(CPUArchState *env, CPUIOTLBEntry
*iotlbentry,
bool locked = false;
MemTxResult r;
- if (iotlbentry->attrs.byte_swap) {
- op ^= MO_BSWAP;
- }
-
section = iotlb_to_section(cpu, iotlbentry->addr, iotlbentry->attrs);
mr = section->mr;
mr_offset = (iotlbentry->addr & TARGET_PAGE_MASK) + addr;
@@ -1311,7 +1302,8 @@ static inline uint64_t wrap_ldul_le(const void *haddr)
static inline uint64_t QEMU_ALWAYS_INLINE
load_helper(CPUArchState *env, target_ulong addr, TCGMemOpIdx oi,
uintptr_t retaddr, MemOp op, bool code_read,
- FullLoadHelper *full_load, LoadHelper *direct)
+ FullLoadHelper *full_load, LoadHelper *direct,
+ LoadHelper *direct_swap)
{
uintptr_t mmu_idx = get_mmuidx(oi);
uintptr_t index = tlb_index(env, mmu_idx, addr);
@@ -1361,17 +1353,22 @@ load_helper(CPUArchState *env, target_ulong addr,
TCGMemOpIdx oi,
/* On watchpoint hit, this will longjmp out. */
cpu_check_watchpoint(env_cpu(env), addr, size,
iotlbentry->attrs, BP_MEM_READ, retaddr);
-
- /* The backing page may or may not require I/O. */
- tlb_addr &= ~TLB_WATCHPOINT;
- if ((tlb_addr & ~TARGET_PAGE_MASK) == 0) {
- goto do_aligned_access;
- }
}
/* Handle I/O access. */
- return io_readx(env, iotlbentry, mmu_idx, addr,
- retaddr, access_type, op);
+ if (likely(tlb_addr & TLB_MMIO)) {
+ return io_readx(env, iotlbentry, mmu_idx, addr,
+ retaddr, access_type,
+ op ^ (tlb_addr & TLB_BSWAP ? MO_BSWAP : 0));
+ }
+
+ haddr = (void *)((uintptr_t)addr + entry->addend);
+
+ if (unlikely(tlb_addr & TLB_BSWAP)) {
+ return direct_swap(haddr);
+ } else {
+ return direct(haddr);
+ }
}
/* Handle slow unaligned access (it spans two pages or IO). */
@@ -1398,7 +1395,6 @@ load_helper(CPUArchState *env, target_ulong addr,
TCGMemOpIdx oi,
return res & MAKE_64BIT_MASK(0, size * 8);
}
- do_aligned_access:
haddr = (void *)((uintptr_t)addr + entry->addend);
return direct(haddr);
}
@@ -1417,7 +1413,7 @@ static uint64_t full_ldub_mmu(CPUArchState *env,
target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_UB, false,
- full_ldub_mmu, wrap_ldub);
+ full_ldub_mmu, wrap_ldub, wrap_ldub);
}
tcg_target_ulong helper_ret_ldub_mmu(CPUArchState *env, target_ulong addr,
@@ -1430,7 +1426,7 @@ static uint64_t full_le_lduw_mmu(CPUArchState *env,
target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_LEUW, false,
- full_le_lduw_mmu, wrap_lduw_le);
+ full_le_lduw_mmu, wrap_lduw_le, wrap_lduw_be);
}
tcg_target_ulong helper_le_lduw_mmu(CPUArchState *env, target_ulong addr,
@@ -1443,7 +1439,7 @@ static uint64_t full_be_lduw_mmu(CPUArchState *env,
target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_BEUW, false,
- full_be_lduw_mmu, wrap_lduw_be);
+ full_be_lduw_mmu, wrap_lduw_be, wrap_lduw_le);
}
tcg_target_ulong helper_be_lduw_mmu(CPUArchState *env, target_ulong addr,
@@ -1456,7 +1452,7 @@ static uint64_t full_le_ldul_mmu(CPUArchState *env,
target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_LEUL, false,
- full_le_ldul_mmu, wrap_ldul_le);
+ full_le_ldul_mmu, wrap_ldul_le, wrap_ldul_be);
}
tcg_target_ulong helper_le_ldul_mmu(CPUArchState *env, target_ulong addr,
@@ -1469,7 +1465,7 @@ static uint64_t full_be_ldul_mmu(CPUArchState *env,
target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_BEUL, false,
- full_be_ldul_mmu, wrap_ldul_be);
+ full_be_ldul_mmu, wrap_ldul_be, wrap_ldul_le);
}
tcg_target_ulong helper_be_ldul_mmu(CPUArchState *env, target_ulong addr,
@@ -1482,14 +1478,14 @@ uint64_t helper_le_ldq_mmu(CPUArchState *env,
target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_LEQ, false,
- helper_le_ldq_mmu, ldq_le_p);
+ helper_le_ldq_mmu, ldq_le_p, ldq_be_p);
}
uint64_t helper_be_ldq_mmu(CPUArchState *env, target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_BEQ, false,
- helper_be_ldq_mmu, ldq_be_p);
+ helper_be_ldq_mmu, ldq_be_p, ldq_le_p);
}
/*
@@ -1563,7 +1559,7 @@ static inline void wrap_stl_le(void *haddr, uint64_t val)
static inline void QEMU_ALWAYS_INLINE
store_helper(CPUArchState *env, target_ulong addr, uint64_t val,
TCGMemOpIdx oi, uintptr_t retaddr, MemOp op,
- StoreHelper *direct)
+ StoreHelper *direct, StoreHelper *direct_swap)
{
uintptr_t mmu_idx = get_mmuidx(oi);
uintptr_t index = tlb_index(env, mmu_idx, addr);
@@ -1608,16 +1604,22 @@ store_helper(CPUArchState *env, target_ulong addr,
uint64_t val,
/* On watchpoint hit, this will longjmp out. */
cpu_check_watchpoint(env_cpu(env), addr, size,
iotlbentry->attrs, BP_MEM_WRITE, retaddr);
-
- /* The backing page may or may not require I/O. */
- tlb_addr &= ~TLB_WATCHPOINT;
- if ((tlb_addr & ~TARGET_PAGE_MASK) == 0) {
- goto do_aligned_access;
- }
}
/* Handle I/O access. */
- io_writex(env, iotlbentry, mmu_idx, val, addr, retaddr, op);
+ if (likely(tlb_addr & (TLB_MMIO | TLB_NOTDIRTY))) {
+ io_writex(env, iotlbentry, mmu_idx, val, addr, retaddr,
+ op ^ (tlb_addr & TLB_BSWAP ? MO_BSWAP : 0));
+ return;
+ }
+
+ haddr = (void *)((uintptr_t)addr + entry->addend);
+
+ if (unlikely(tlb_addr & TLB_BSWAP)) {
+ direct_swap(haddr, val);
+ } else {
+ direct(haddr, val);
+ }
return;
}
@@ -1686,7 +1688,6 @@ store_helper(CPUArchState *env, target_ulong addr,
uint64_t val,
return;
}
- do_aligned_access:
haddr = (void *)((uintptr_t)addr + entry->addend);
direct(haddr, val);
}
@@ -1694,43 +1695,47 @@ store_helper(CPUArchState *env, target_ulong addr,
uint64_t val,
void helper_ret_stb_mmu(CPUArchState *env, target_ulong addr, uint8_t val,
TCGMemOpIdx oi, uintptr_t retaddr)
{
- store_helper(env, addr, val, oi, retaddr, MO_UB, wrap_stb);
+ store_helper(env, addr, val, oi, retaddr, MO_UB, wrap_stb, wrap_stb);
}
void helper_le_stw_mmu(CPUArchState *env, target_ulong addr, uint16_t val,
TCGMemOpIdx oi, uintptr_t retaddr)
{
- store_helper(env, addr, val, oi, retaddr, MO_LEUW, wrap_stw_le);
+ store_helper(env, addr, val, oi, retaddr, MO_LEUW,
+ wrap_stw_le, wrap_stw_be);
}
void helper_be_stw_mmu(CPUArchState *env, target_ulong addr, uint16_t val,
TCGMemOpIdx oi, uintptr_t retaddr)
{
- store_helper(env, addr, val, oi, retaddr, MO_BEUW, wrap_stw_be);
+ store_helper(env, addr, val, oi, retaddr, MO_BEUW,
+ wrap_stw_be, wrap_stw_le);
}
void helper_le_stl_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
TCGMemOpIdx oi, uintptr_t retaddr)
{
- store_helper(env, addr, val, oi, retaddr, MO_LEUL, wrap_stl_le);
+ store_helper(env, addr, val, oi, retaddr, MO_LEUL,
+ wrap_stl_le, wrap_stl_be);
}
void helper_be_stl_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
TCGMemOpIdx oi, uintptr_t retaddr)
{
- store_helper(env, addr, val, oi, retaddr, MO_BEUL, wrap_stl_be);
+ store_helper(env, addr, val, oi, retaddr, MO_BEUL,
+ wrap_stl_be, wrap_stl_le);
}
void helper_le_stq_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
TCGMemOpIdx oi, uintptr_t retaddr)
{
- store_helper(env, addr, val, oi, retaddr, MO_LEQ, stq_le_p);
+ store_helper(env, addr, val, oi, retaddr, MO_LEQ, stq_le_p, stq_be_p);
}
void helper_be_stq_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
TCGMemOpIdx oi, uintptr_t retaddr)
{
- store_helper(env, addr, val, oi, retaddr, MO_BEQ, stq_be_p);
+ store_helper(env, addr, val, oi, retaddr, MO_BEQ, stq_be_p, stq_le_p);
}
/* First set of helpers allows passing in of OI and RETADDR. This makes
@@ -1796,7 +1801,7 @@ static uint64_t full_ldub_cmmu(CPUArchState *env,
target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_8, true,
- full_ldub_cmmu, wrap_ldub);
+ full_ldub_cmmu, wrap_ldub, wrap_ldub);
}
uint8_t helper_ret_ldb_cmmu(CPUArchState *env, target_ulong addr,
@@ -1809,7 +1814,7 @@ static uint64_t full_le_lduw_cmmu(CPUArchState *env,
target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_LEUW, true,
- full_le_lduw_cmmu, wrap_lduw_le);
+ full_le_lduw_cmmu, wrap_lduw_le, wrap_lduw_be);
}
uint16_t helper_le_ldw_cmmu(CPUArchState *env, target_ulong addr,
@@ -1822,7 +1827,7 @@ static uint64_t full_be_lduw_cmmu(CPUArchState *env,
target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_BEUW, true,
- full_be_lduw_cmmu, wrap_lduw_be);
+ full_be_lduw_cmmu, wrap_lduw_be, wrap_lduw_le);
}
uint16_t helper_be_ldw_cmmu(CPUArchState *env, target_ulong addr,
@@ -1835,7 +1840,7 @@ static uint64_t full_le_ldul_cmmu(CPUArchState *env,
target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_LEUL, true,
- full_le_ldul_cmmu, wrap_ldul_le);
+ full_le_ldul_cmmu, wrap_ldul_le, wrap_ldul_be);
}
uint32_t helper_le_ldl_cmmu(CPUArchState *env, target_ulong addr,
@@ -1848,7 +1853,7 @@ static uint64_t full_be_ldul_cmmu(CPUArchState *env,
target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_BEUL, true,
- full_be_ldul_cmmu, wrap_ldul_be);
+ full_be_ldul_cmmu, wrap_ldul_be, wrap_ldul_le);
}
uint32_t helper_be_ldl_cmmu(CPUArchState *env, target_ulong addr,
@@ -1861,12 +1866,12 @@ uint64_t helper_le_ldq_cmmu(CPUArchState *env,
target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_LEQ, true,
- helper_le_ldq_cmmu, ldq_le_p);
+ helper_le_ldq_cmmu, ldq_le_p, ldq_be_p);
}
uint64_t helper_be_ldq_cmmu(CPUArchState *env, target_ulong addr,
TCGMemOpIdx oi, uintptr_t retaddr)
{
return load_helper(env, addr, oi, retaddr, MO_BEQ, true,
- helper_be_ldq_cmmu, ldq_be_p);
+ helper_be_ldq_cmmu, ldq_be_p, ldq_le_p);
}
--
2.17.1
- [Qemu-devel] [RFC v2 0/5] Move notdirty handling to cputlb, Richard Henderson, 2019/09/18
- [Qemu-devel] [RFC v2 1/5] cputlb: Disable __always_inline__ without optimization, Richard Henderson, 2019/09/18
- [Qemu-devel] [RFC v2 2/5] cputlb: Replace switches in load/store_helper with callback, Richard Henderson, 2019/09/18
- [Qemu-devel] [RFC v2 4/5] exec: Adjust notdirty tracing, Richard Henderson, 2019/09/18
- [Qemu-devel] [RFC v2 5/5] cputlb: Move NOTDIRTY handling from I/O path to TLB path, Richard Henderson, 2019/09/18
- [Qemu-devel] [RFC v2 3/5] cputlb: Introduce TLB_BSWAP,
Richard Henderson <=
- Re: [Qemu-devel] [RFC v2 0/5] Move notdirty handling to cputlb, no-reply, 2019/09/19
- Re: [Qemu-devel] [RFC v2 0/5] Move notdirty handling to cputlb, no-reply, 2019/09/19
- Re: [Qemu-devel] [RFC v2 0/5] Move notdirty handling to cputlb, no-reply, 2019/09/19
- Re: [RFC v2 0/5] Move notdirty handling to cputlb, Richard Henderson, 2019/09/21