diff mbox series

[RFC,07/22] x86/PMUv1: allow topdown slots arch perf event

Message ID f1fef9da51b4964a04a634d65797099a5e4efd47.1698261255.git.edwin.torok@cloud.com (mailing list archive)
State New, archived
Headers show
Series vPMU bugfixes and support for PMUv5 | expand

Commit Message

Edwin Török Oct. 25, 2023, 7:29 p.m. UTC 
From: Edwin Török <edvin.torok@citrix.com>

This is part of 'Architectural Performance Monitoring Version 1'
and implemented on Icelake.

Backport: 4.13+

Signed-off-by: Edwin Török <edvin.torok@citrix.com>
---
 xen/arch/x86/cpu/vpmu_intel.c | 1 +
 xen/arch/x86/cpuid.c          | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/xen/arch/x86/cpu/vpmu_intel.c b/xen/arch/x86/cpu/vpmu_intel.c
index ec9ab01fde..44a1ed5b10 100644
--- a/xen/arch/x86/cpu/vpmu_intel.c
+++ b/xen/arch/x86/cpu/vpmu_intel.c
@@ -645,6 +645,7 @@  static int cf_check core2_vpmu_do_wrmsr(unsigned int msr, uint64_t msr_content)
                 case 0x412e:	/* Last Level Cache Misses */
                 case 0x00c4:	/* Branch Instructions Retired */
                 case 0x00c5:	/* All Branch Mispredict Retired */
+                case 0x01a4:	/* Topdown Slots */
                     blocked = 0;
                     break;
                }
diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
index dfbcd1b3a4..51ee89afc4 100644
--- a/xen/arch/x86/cpuid.c
+++ b/xen/arch/x86/cpuid.c
@@ -328,7 +328,7 @@  void guest_cpuid(const struct vcpu *v, uint32_t leaf,
 
             if ( vpmu_features & (XENPMU_FEATURE_IPC_ONLY |
                                   XENPMU_FEATURE_ARCH_ONLY) ) {
-                unsigned limit = ( vpmu_features & XENPMU_FEATURE_ARCH_ONLY ) ? 7 : 3;
+                unsigned limit = ( vpmu_features & XENPMU_FEATURE_ARCH_ONLY ) ? 8 : 3;
                 if (limit < u.arch_nr) {
                     gdprintk(XENLOG_WARNING, "Limiting architectural PMU events to %d (actual %d)", limit, u.arch_nr);
                     u.arch_nr = limit;