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From: Like Xu <like.xu@linux.intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
	Richard Henderson <rth@twiddle.net>,
	Eduardo Habkost <ehabkost@redhat.com>
Cc: qemu-trivial@nongnu.org, qemu-devel@nongnu.org,
	Like Xu <like.xu@linux.intel.com>
Subject: [PATCH] i386/cpu: Expand MAX_FIXED_COUNTERS from 3 to 4 to for Icelake
Date: Tue, 17 Mar 2020 13:54:13 +0800
Message-ID: <20200317055413.66404-1-like.xu@linux.intel.com> (raw)

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 <like.xu@linux.intel.com>
---
 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



             reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-17  5:54 Like Xu [this message]
2020-03-26 12:46 ` Like Xu
2020-03-26 18:48 ` Paolo Bonzini
2020-03-26 23:56   ` Like Xu

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