From 30f4b05bd090564181554d0890605eb2c143e4ea Mon Sep 17 00:00:00 2001 From: David Gibson Date: Fri, 12 May 2017 15:46:11 +1000 Subject: pseries: Stubs for HPT resizing This introduces stub implementations of the H_RESIZE_HPT_PREPARE and H_RESIZE_HPT_COMMIT hypercalls which we hope to add in a PAPR extension to allow run time resizing of a guest's hash page table. It also adds a new machine property for controlling whether this new facility is available. For now we only allow resizing with TCG, allowing it with KVM will require kernel changes as well. Finally, it adds a new string to the hypertas property in the device tree, advertising to the guest the availability of the HPT resizing hypercalls. This is a tentative suggested value, and would need to be standardized by PAPR before being merged. Signed-off-by: David Gibson Reviewed-by: Suraj Jitindar Singh Reviewed-by: Laurent Vivier --- target/ppc/kvm.c | 13 +++++++++++++ target/ppc/kvm_ppc.h | 5 +++++ 2 files changed, 18 insertions(+) (limited to 'target/ppc') diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c index f7a7ea5858..8bafd1e932 100644 --- a/target/ppc/kvm.c +++ b/target/ppc/kvm.c @@ -22,6 +22,7 @@ #include #include "qemu-common.h" +#include "qapi/error.h" #include "qemu/error-report.h" #include "cpu.h" #include "cpu-models.h" @@ -2709,3 +2710,15 @@ int kvmppc_enable_hwrng(void) return kvmppc_enable_hcall(kvm_state, H_RANDOM); } + +void kvmppc_check_papr_resize_hpt(Error **errp) +{ + if (!kvm_enabled()) { + return; + } + + /* TODO: Check for resize-capable KVM implementations */ + + error_setg(errp, + "Hash page table resizing not available with this KVM version"); +} diff --git a/target/ppc/kvm_ppc.h b/target/ppc/kvm_ppc.h index eab7c8fdb3..9be706c5c9 100644 --- a/target/ppc/kvm_ppc.h +++ b/target/ppc/kvm_ppc.h @@ -63,6 +63,7 @@ bool kvmppc_has_cap_mmu_hash_v3(void); int kvmppc_enable_hwrng(void); int kvmppc_put_books_sregs(PowerPCCPU *cpu); PowerPCCPUClass *kvm_ppc_get_host_cpu_class(void); +void kvmppc_check_papr_resize_hpt(Error **errp); bool kvmppc_is_mem_backend_page_size_ok(const char *obj_path); @@ -297,6 +298,10 @@ static inline PowerPCCPUClass *kvm_ppc_get_host_cpu_class(void) return NULL; } +static inline void kvmppc_check_papr_resize_hpt(Error **errp) +{ + return; +} #endif #ifndef CONFIG_KVM -- cgit v1.2.3