[PATCH 3/3] KVM: arm64: Move host EL1 code out of hyp/ directory
Fuad Tabba
tabba at google.com
Fri Dec 3 00:32:13 PST 2021
Hi Will,
On Thu, Dec 2, 2021 at 5:11 PM Will Deacon <will at kernel.org> wrote:
>
> kvm/hyp/reserved_mem.c contains host code executing at EL1 and is not
> linked into the hypervisor object. Move the file into kvm/pkvm.c and
> rework the headers so that the definitions shared between the host and
> the hypervisor live in asm/kvm_pkvm.h.
It's good to have only hyp code in hyp.
Tested-by: Fuad Tabba <tabba at google.com>
Reviewed-by: Fuad Tabba <tabba at google.com>
Cheers,
/fuad
> Signed-off-by: Will Deacon <will at kernel.org>
> ---
> arch/arm64/include/asm/kvm_pkvm.h | 71 +++++++++++++++++++
> arch/arm64/kvm/Makefile | 2 +-
> arch/arm64/kvm/hyp/Makefile | 2 +-
> arch/arm64/kvm/hyp/include/nvhe/mm.h | 57 ---------------
> arch/arm64/kvm/hyp/nvhe/mem_protect.c | 1 +
> arch/arm64/kvm/hyp/nvhe/mm.c | 1 +
> arch/arm64/kvm/hyp/nvhe/setup.c | 1 +
> arch/arm64/kvm/{hyp/reserved_mem.c => pkvm.c} | 8 +--
> 8 files changed, 80 insertions(+), 63 deletions(-)
> create mode 100644 arch/arm64/include/asm/kvm_pkvm.h
> rename arch/arm64/kvm/{hyp/reserved_mem.c => pkvm.c} (94%)
>
> diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm_pkvm.h
> new file mode 100644
> index 000000000000..9f4ad2a8df59
> --- /dev/null
> +++ b/arch/arm64/include/asm/kvm_pkvm.h
> @@ -0,0 +1,71 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2020 - Google LLC
> + * Author: Quentin Perret <qperret at google.com>
> + */
> +#ifndef __ARM64_KVM_PKVM_H__
> +#define __ARM64_KVM_PKVM_H__
> +
> +#include <linux/memblock.h>
> +#include <asm/kvm_pgtable.h>
> +
> +#define HYP_MEMBLOCK_REGIONS 128
> +
> +extern struct memblock_region kvm_nvhe_sym(hyp_memory)[];
> +extern unsigned int kvm_nvhe_sym(hyp_memblock_nr);
> +
> +static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages)
> +{
> + unsigned long total = 0, i;
> +
> + /* Provision the worst case scenario */
> + for (i = 0; i < KVM_PGTABLE_MAX_LEVELS; i++) {
> + nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE);
> + total += nr_pages;
> + }
> +
> + return total;
> +}
> +
> +static inline unsigned long __hyp_pgtable_total_pages(void)
> +{
> + unsigned long res = 0, i;
> +
> + /* Cover all of memory with page-granularity */
> + for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) {
> + struct memblock_region *reg = &kvm_nvhe_sym(hyp_memory)[i];
> + res += __hyp_pgtable_max_pages(reg->size >> PAGE_SHIFT);
> + }
> +
> + return res;
> +}
> +
> +static inline unsigned long hyp_s1_pgtable_pages(void)
> +{
> + unsigned long res;
> +
> + res = __hyp_pgtable_total_pages();
> +
> + /* Allow 1 GiB for private mappings */
> + res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
> +
> + return res;
> +}
> +
> +static inline unsigned long host_s2_pgtable_pages(void)
> +{
> + unsigned long res;
> +
> + /*
> + * Include an extra 16 pages to safely upper-bound the worst case of
> + * concatenated pgds.
> + */
> + res = __hyp_pgtable_total_pages() + 16;
> +
> + /* Allow 1 GiB for MMIO mappings */
> + res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
> +
> + return res;
> +}
> +
> +#endif /* __ARM64_KVM_PKVM_H__ */
> diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
> index 0b561752f8d8..8ca8cf6f5619 100644
> --- a/arch/arm64/kvm/Makefile
> +++ b/arch/arm64/kvm/Makefile
> @@ -15,7 +15,7 @@ kvm-y := $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o \
> arm.o mmu.o mmio.o psci.o perf.o hypercalls.o pvtime.o \
> inject_fault.o va_layout.o handle_exit.o \
> guest.o debug.o reset.o sys_regs.o \
> - vgic-sys-reg-v3.o fpsimd.o pmu.o \
> + vgic-sys-reg-v3.o fpsimd.o pmu.o pkvm.o \
> arch_timer.o trng.o\
> vgic/vgic.o vgic/vgic-init.o \
> vgic/vgic-irqfd.o vgic/vgic-v2.o \
> diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
> index b726332eec49..687598e41b21 100644
> --- a/arch/arm64/kvm/hyp/Makefile
> +++ b/arch/arm64/kvm/hyp/Makefile
> @@ -10,4 +10,4 @@ subdir-ccflags-y := -I$(incdir) \
> -DDISABLE_BRANCH_PROFILING \
> $(DISABLE_STACKLEAK_PLUGIN)
>
> -obj-$(CONFIG_KVM) += vhe/ nvhe/ pgtable.o reserved_mem.o
> +obj-$(CONFIG_KVM) += vhe/ nvhe/ pgtable.o
> diff --git a/arch/arm64/kvm/hyp/include/nvhe/mm.h b/arch/arm64/kvm/hyp/include/nvhe/mm.h
> index c9a8f535212e..ef6a58a04235 100644
> --- a/arch/arm64/kvm/hyp/include/nvhe/mm.h
> +++ b/arch/arm64/kvm/hyp/include/nvhe/mm.h
> @@ -10,9 +10,6 @@
> #include <nvhe/memory.h>
> #include <nvhe/spinlock.h>
>
> -#define HYP_MEMBLOCK_REGIONS 128
> -extern struct memblock_region kvm_nvhe_sym(hyp_memory)[];
> -extern unsigned int kvm_nvhe_sym(hyp_memblock_nr);
> extern struct kvm_pgtable pkvm_pgtable;
> extern hyp_spinlock_t pkvm_pgd_lock;
> extern struct hyp_pool hpool;
> @@ -39,58 +36,4 @@ static inline void hyp_vmemmap_range(phys_addr_t phys, unsigned long size,
> *end = ALIGN(*end, PAGE_SIZE);
> }
>
> -static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages)
> -{
> - unsigned long total = 0, i;
> -
> - /* Provision the worst case scenario */
> - for (i = 0; i < KVM_PGTABLE_MAX_LEVELS; i++) {
> - nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE);
> - total += nr_pages;
> - }
> -
> - return total;
> -}
> -
> -static inline unsigned long __hyp_pgtable_total_pages(void)
> -{
> - unsigned long res = 0, i;
> -
> - /* Cover all of memory with page-granularity */
> - for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) {
> - struct memblock_region *reg = &kvm_nvhe_sym(hyp_memory)[i];
> - res += __hyp_pgtable_max_pages(reg->size >> PAGE_SHIFT);
> - }
> -
> - return res;
> -}
> -
> -static inline unsigned long hyp_s1_pgtable_pages(void)
> -{
> - unsigned long res;
> -
> - res = __hyp_pgtable_total_pages();
> -
> - /* Allow 1 GiB for private mappings */
> - res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
> -
> - return res;
> -}
> -
> -static inline unsigned long host_s2_pgtable_pages(void)
> -{
> - unsigned long res;
> -
> - /*
> - * Include an extra 16 pages to safely upper-bound the worst case of
> - * concatenated pgds.
> - */
> - res = __hyp_pgtable_total_pages() + 16;
> -
> - /* Allow 1 GiB for MMIO mappings */
> - res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
> -
> - return res;
> -}
> -
> #endif /* __KVM_HYP_MM_H */
> diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
> index c1a90dd022b8..92262e89672d 100644
> --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c
> +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
> @@ -9,6 +9,7 @@
> #include <asm/kvm_hyp.h>
> #include <asm/kvm_mmu.h>
> #include <asm/kvm_pgtable.h>
> +#include <asm/kvm_pkvm.h>
> #include <asm/stage2_pgtable.h>
>
> #include <hyp/fault.h>
> diff --git a/arch/arm64/kvm/hyp/nvhe/mm.c b/arch/arm64/kvm/hyp/nvhe/mm.c
> index 2fabeceb889a..9e0ff5a700dd 100644
> --- a/arch/arm64/kvm/hyp/nvhe/mm.c
> +++ b/arch/arm64/kvm/hyp/nvhe/mm.c
> @@ -8,6 +8,7 @@
> #include <asm/kvm_hyp.h>
> #include <asm/kvm_mmu.h>
> #include <asm/kvm_pgtable.h>
> +#include <asm/kvm_pkvm.h>
> #include <asm/spectre.h>
>
> #include <nvhe/early_alloc.h>
> diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setup.c
> index 578f71798c2e..51e68a040d8a 100644
> --- a/arch/arm64/kvm/hyp/nvhe/setup.c
> +++ b/arch/arm64/kvm/hyp/nvhe/setup.c
> @@ -8,6 +8,7 @@
> #include <asm/kvm_hyp.h>
> #include <asm/kvm_mmu.h>
> #include <asm/kvm_pgtable.h>
> +#include <asm/kvm_pkvm.h>
>
> #include <nvhe/early_alloc.h>
> #include <nvhe/fixed_config.h>
> diff --git a/arch/arm64/kvm/hyp/reserved_mem.c b/arch/arm64/kvm/pkvm.c
> similarity index 94%
> rename from arch/arm64/kvm/hyp/reserved_mem.c
> rename to arch/arm64/kvm/pkvm.c
> index 578670e3f608..ebecb7c045f4 100644
> --- a/arch/arm64/kvm/hyp/reserved_mem.c
> +++ b/arch/arm64/kvm/pkvm.c
> @@ -8,10 +8,9 @@
> #include <linux/memblock.h>
> #include <linux/sort.h>
>
> -#include <asm/kvm_host.h>
> +#include <asm/kvm_pkvm.h>
>
> -#include <nvhe/memory.h>
> -#include <nvhe/mm.h>
> +#include "hyp_constants.h"
>
> static struct memblock_region *hyp_memory = kvm_nvhe_sym(hyp_memory);
> static unsigned int *hyp_memblock_nr_ptr = &kvm_nvhe_sym(hyp_memblock_nr);
> @@ -82,7 +81,8 @@ void __init kvm_hyp_reserve(void)
> do {
> prev = nr_pages;
> nr_pages = hyp_mem_pages + prev;
> - nr_pages = DIV_ROUND_UP(nr_pages * sizeof(struct hyp_page), PAGE_SIZE);
> + nr_pages = DIV_ROUND_UP(nr_pages * STRUCT_HYP_PAGE_SIZE,
> + PAGE_SIZE);
> nr_pages += __hyp_pgtable_max_pages(nr_pages);
> } while (nr_pages != prev);
> hyp_mem_pages += nr_pages;
> --
> 2.34.0.rc2.393.gf8c9666880-goog
>
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