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mips: Improve segment defs for KVM T&E guests 

Improve the segment definitions used by get_physical_address() to yield
target_ulong types, e.g. 0xffffffff80000000 instead of 0x80000000. This
is in preparation for enabling emulation of MIPS KVM T&E segments in TCG
MIPS targets, which unlike KVM could potentially have 64-bit
target_ulong. In such a case the offset guest KSEG0 address ends up at
e.g. 0x000000008xxxxxxx instead of 0xffffffff8xxxxxxx.

This also allows the casts to int32_t that force sign extension to be
removed, which removes any confusion due to relational comparison of
unsigned (target_ulong) and signed (int32_t) types.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Yongbok Kim <yongbok.kim@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>
This commit is contained in:
James Hogan 2017-07-31 14:09:12 +01:00 committed by Yongbok Kim
parent 9652ef24bf
commit 6743334568
1 changed files with 11 additions and 12 deletions
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23
target/mips/helper.c
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@ -216,14 +216,14 @@ static int get_physical_address (CPUMIPSState *env, hwaddr *physical,
/* effective address (modified for KVM T&E kernel segments) */
target_ulong address = real_address;
#define USEG_LIMIT 0x7FFFFFFFUL
#define KSEG0_BASE 0x80000000UL
#define KSEG1_BASE 0xA0000000UL
#define KSEG2_BASE 0xC0000000UL
#define KSEG3_BASE 0xE0000000UL
#define USEG_LIMIT ((target_ulong)(int32_t)0x7FFFFFFFUL)
#define KSEG0_BASE ((target_ulong)(int32_t)0x80000000UL)
#define KSEG1_BASE ((target_ulong)(int32_t)0xA0000000UL)
#define KSEG2_BASE ((target_ulong)(int32_t)0xC0000000UL)
#define KSEG3_BASE ((target_ulong)(int32_t)0xE0000000UL)
#define KVM_KSEG0_BASE 0x40000000UL
#define KVM_KSEG2_BASE 0x60000000UL
#define KVM_KSEG0_BASE ((target_ulong)(int32_t)0x40000000UL)
#define KVM_KSEG2_BASE ((target_ulong)(int32_t)0x60000000UL)
if (kvm_enabled()) {
/* KVM T&E adds guest kernel segments in useg */
@ -307,17 +307,17 @@ static int get_physical_address (CPUMIPSState *env, hwaddr *physical,
ret = TLBRET_BADADDR;
}
#endif
} else if (address < (int32_t)KSEG1_BASE) {
} else if (address < KSEG1_BASE) {
/* kseg0 */
ret = get_segctl_physical_address(env, physical, prot, real_address, rw,
access_type, mmu_idx,
env->CP0_SegCtl1 >> 16, 0x1FFFFFFF);
} else if (address < (int32_t)KSEG2_BASE) {
} else if (address < KSEG2_BASE) {
/* kseg1 */
ret = get_segctl_physical_address(env, physical, prot, real_address, rw,
access_type, mmu_idx,
env->CP0_SegCtl1, 0x1FFFFFFF);
} else if (address < (int32_t)KSEG3_BASE) {
} else if (address < KSEG3_BASE) {
/* sseg (kseg2) */
ret = get_segctl_physical_address(env, physical, prot, real_address, rw,
access_type, mmu_idx,
@ -974,8 +974,7 @@ void mips_cpu_do_interrupt(CPUState *cs)
} else if (cause == 30 && !(env->CP0_Config3 & (1 << CP0C3_SC) &&
env->CP0_Config5 & (1 << CP0C5_CV))) {
/* Force KSeg1 for cache errors */
env->active_tc.PC = (int32_t)KSEG1_BASE |
(env->CP0_EBase & 0x1FFFF000);
env->active_tc.PC = KSEG1_BASE | (env->CP0_EBase & 0x1FFFF000);
} else {
env->active_tc.PC = env->CP0_EBase & ~0xfff;
}