[{"id":3670688,"web_url":"http://patchwork.ozlabs.org/comment/3670688/","msgid":"","list_archive_url":null,"date":"2026-03-28T16:27:55","subject":"Re: [PATCH] hw/riscv/virt-acpi-build.c: Use kvm timer frequency when\n kvm enabled","submitter":{"id":92377,"url":"http://patchwork.ozlabs.org/api/people/92377/","name":"Andrew Jones","email":"andrew.jones@oss.qualcomm.com"},"content":"On Wed, Mar 25, 2026 at 04:13:14PM +0800, Yicong Yang wrote:\n> The timer frequency is decided by the host(kvm) rather than a fixed\n> RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ on kvm accelerated VM. So build\n> RCHT with KVM provided timer frequency if KVM is enabled, just like\n> how we build the timer node on DT based VM.\n> \n> Fixes: ebfd39289370 (\"hw/riscv/virt: virt-acpi-build.c: Add RHCT Table\")\n> Signed-off-by: Yicong Yang \n> ---\n> hw/riscv/virt-acpi-build.c | 7 ++++++-\n> 1 file changed, 6 insertions(+), 1 deletion(-)\n> \n> diff --git a/hw/riscv/virt-acpi-build.c b/hw/riscv/virt-acpi-build.c\n> index f1406cb68339..fd6ca5dbc4ff 100644\n> --- a/hw/riscv/virt-acpi-build.c\n> +++ b/hw/riscv/virt-acpi-build.c\n> @@ -35,9 +35,11 @@\n> #include \"hw/riscv/virt.h\"\n> #include \"hw/riscv/numa.h\"\n> #include \"hw/virtio/virtio-acpi.h\"\n> +#include \"kvm/kvm_riscv.h\"\n> #include \"migration/vmstate.h\"\n> #include \"qapi/error.h\"\n> #include \"qemu/error-report.h\"\n> +#include \"system/kvm.h\"\n> #include \"system/reset.h\"\n> \n> #define ACPI_BUILD_TABLE_SIZE 0x20000\n> @@ -296,7 +298,10 @@ static void build_rhct(GArray *table_data,\n> \n> /* Time Base Frequency */\n> build_append_int_noprefix(table_data,\n> - RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ, 8);\n> + kvm_enabled() ?\n> + kvm_riscv_get_timebase_frequency(&s->soc->harts[0]) :\n> + RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ,\n> + 8);\n> \n> /* ISA + N hart info */\n> num_rhct_nodes = 1 + ms->smp.cpus;\n> -- \n> 2.34.1\n>\n\nReviewed-by: Andrew Jones ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=PMRIfP90;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=LSvzrS56;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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So build\n> RCHT with KVM provided timer frequency if KVM is enabled, just like\n> how we build the timer node on DT based VM.\n>\n> Fixes: ebfd39289370 (\"hw/riscv/virt: virt-acpi-build.c: Add RHCT Table\")\n> Signed-off-by: Yicong Yang \n\nThanks!\n\nApplied to riscv-to-apply.next\n\nAlistair\n\n> ---\n> hw/riscv/virt-acpi-build.c | 7 ++++++-\n> 1 file changed, 6 insertions(+), 1 deletion(-)\n>\n> diff --git a/hw/riscv/virt-acpi-build.c b/hw/riscv/virt-acpi-build.c\n> index f1406cb68339..fd6ca5dbc4ff 100644\n> --- a/hw/riscv/virt-acpi-build.c\n> +++ b/hw/riscv/virt-acpi-build.c\n> @@ -35,9 +35,11 @@\n> #include \"hw/riscv/virt.h\"\n> #include \"hw/riscv/numa.h\"\n> #include \"hw/virtio/virtio-acpi.h\"\n> +#include \"kvm/kvm_riscv.h\"\n> #include \"migration/vmstate.h\"\n> #include \"qapi/error.h\"\n> #include \"qemu/error-report.h\"\n> +#include \"system/kvm.h\"\n> #include \"system/reset.h\"\n>\n> #define ACPI_BUILD_TABLE_SIZE 0x20000\n> @@ -296,7 +298,10 @@ static void build_rhct(GArray *table_data,\n>\n> /* Time Base Frequency */\n> build_append_int_noprefix(table_data,\n> - RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ, 8);\n> + kvm_enabled() ?\n> + kvm_riscv_get_timebase_frequency(&s->soc->harts[0]) :\n> + RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ,\n> + 8);\n>\n> /* ISA + N hart info */\n> num_rhct_nodes = 1 + ms->smp.cpus;\n> --\n> 2.34.1\n>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=dBldVqZb;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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