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[PATCH] i386/cpu: Expand MAX_FIXED_COUNTERS from 3 to 4 to for Icelake


From: Like Xu
Subject: [PATCH] i386/cpu: Expand MAX_FIXED_COUNTERS from 3 to 4 to for Icelake
Date: Tue, 17 Mar 2020 13:54:13 +0800

In the Intel SDM, "Table 18-2. Association of Fixed-Function
Performance Counters with Architectural Performance Events",
we may have a new fixed counter 'TOPDOWN.SLOTS' (since Icelake),
which counts the number of available slots for an unhalted
logical processor. Check commit 6017608936 in the kernel tree.

Signed-off-by: Like Xu <address@hidden>
---
 target/i386/cpu.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 576f309bbf..ec2b67d425 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1185,7 +1185,7 @@ typedef struct {
 #define CPU_NB_REGS CPU_NB_REGS32
 #endif
 
-#define MAX_FIXED_COUNTERS 3
+#define MAX_FIXED_COUNTERS 4
 #define MAX_GP_COUNTERS    (MSR_IA32_PERF_STATUS - MSR_P6_EVNTSEL0)
 
 #define TARGET_INSN_START_EXTRA_WORDS 1
-- 
2.21.1




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