[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v7 12/16] x86/xen: Add Hygon Dhyana support to Xen
To make Xen works functionally on Hygon platform, reuse AMD's Xen support code path for Hygon Dhyana CPU. There are six core performance events counters per thread, so there are six MSRs for these counters(0-5). Also there are four legacy PMC MSRs, they are alias of the counters(0-3). In this version of kernel Hygon use the legacy and safe version of MSR access. It works fine when VPMU enabled in Xen on Hygon platform by testing with perf. Signed-off-by: Pu Wen <puwen@xxxxxxxx> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> --- arch/x86/xen/pmu.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/arch/x86/xen/pmu.c b/arch/x86/xen/pmu.c index 7d00d4a..9403854 100644 --- a/arch/x86/xen/pmu.c +++ b/arch/x86/xen/pmu.c @@ -90,6 +90,12 @@ static void xen_pmu_arch_init(void) k7_counters_mirrored = 0; break; } + } else if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) { + amd_num_counters = F10H_NUM_COUNTERS; + amd_counters_base = MSR_K7_PERFCTR0; + amd_ctrls_base = MSR_K7_EVNTSEL0; + amd_msr_step = 1; + k7_counters_mirrored = 0; } else { uint32_t eax, ebx, ecx, edx; @@ -285,7 +291,7 @@ static bool xen_amd_pmu_emulate(unsigned int msr, u64 *val, bool is_read) bool pmu_msr_read(unsigned int msr, uint64_t *val, int *err) { - if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) { + if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL) { if (is_amd_pmu_msr(msr)) { if (!xen_amd_pmu_emulate(msr, val, 1)) *val = native_read_msr_safe(msr, err); @@ -308,7 +314,7 @@ bool pmu_msr_write(unsigned int msr, uint32_t low, uint32_t high, int *err) { uint64_t val = ((uint64_t)high << 32) | low; - if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) { + if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL) { if (is_amd_pmu_msr(msr)) { if (!xen_amd_pmu_emulate(msr, &val, 0)) *err = native_write_msr_safe(msr, low, high); @@ -379,7 +385,7 @@ static unsigned long long xen_intel_read_pmc(int counter) unsigned long long xen_read_pmc(int counter) { - if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) + if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL) return xen_amd_read_pmc(counter); else return xen_intel_read_pmc(counter); -- 2.7.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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