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Date: Mon, 18 Oct 2021 08:00:00 -0700
From: Mingwei Zhang <mizhang@...gle.com>
To: Michael Roth <michael.roth@....com>
Cc: linux-kselftest@...r.kernel.org, kvm <kvm@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
Nathan Tempelman <natet@...gle.com>,
Marc Orr <marcorr@...gle.com>,
Steve Rutherford <srutherford@...gle.com>,
Sean Christopherson <seanjc@...gle.com>,
Brijesh Singh <brijesh.singh@....com>,
Tom Lendacky <thomas.lendacky@....com>,
Varad Gautam <varad.gautam@...e.com>,
Shuah Khan <shuah@...nel.org>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
David Woodhouse <dwmw@...zon.co.uk>,
Ricardo Koller <ricarkol@...gle.com>,
Jim Mattson <jmattson@...gle.com>,
Wanpeng Li <wanpengli@...cent.com>,
Joerg Roedel <joro@...tes.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"H . Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC 01/16] KVM: selftests: move vm_phy_pages_alloc() earlier in file
On Tue, Oct 5, 2021 at 4:46 PM Michael Roth <michael.roth@....com> wrote:
>
> Subsequent patches will break some of this code out into file-local
> helper functions, which will be used by functions like vm_vaddr_alloc(),
> which currently are defined earlier in the file, so a forward
> declaration would be needed.
>
> Instead, move it earlier in the file, just above vm_vaddr_alloc() and
> and friends, which are the main users.
>
> Signed-off-by: Michael Roth <michael.roth@....com>
> ---
> tools/testing/selftests/kvm/lib/kvm_util.c | 146 ++++++++++-----------
> 1 file changed, 73 insertions(+), 73 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index 10a8ed691c66..92f59adddebe 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -1145,6 +1145,79 @@ void vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid)
> list_add(&vcpu->list, &vm->vcpus);
> }
>
> +/*
> + * Physical Contiguous Page Allocator
> + *
> + * Input Args:
> + * vm - Virtual Machine
> + * num - number of pages
> + * paddr_min - Physical address minimum
> + * memslot - Memory region to allocate page from
> + *
> + * Output Args: None
> + *
> + * Return:
> + * Starting physical address
> + *
> + * Within the VM specified by vm, locates a range of available physical
> + * pages at or above paddr_min. If found, the pages are marked as in use
> + * and their base address is returned. A TEST_ASSERT failure occurs if
> + * not enough pages are available at or above paddr_min.
> + */
> +vm_paddr_t vm_phy_pages_alloc(struct kvm_vm *vm, size_t num,
> + vm_paddr_t paddr_min, uint32_t memslot)
> +{
> + struct userspace_mem_region *region;
> + sparsebit_idx_t pg, base;
> +
> + TEST_ASSERT(num > 0, "Must allocate at least one page");
> +
> + TEST_ASSERT((paddr_min % vm->page_size) == 0, "Min physical address "
> + "not divisible by page size.\n"
> + " paddr_min: 0x%lx page_size: 0x%x",
> + paddr_min, vm->page_size);
> +
> + region = memslot2region(vm, memslot);
> + base = pg = paddr_min >> vm->page_shift;
> +
> + do {
> + for (; pg < base + num; ++pg) {
> + if (!sparsebit_is_set(region->unused_phy_pages, pg)) {
> + base = pg = sparsebit_next_set(region->unused_phy_pages, pg);
> + break;
> + }
> + }
> + } while (pg && pg != base + num);
> +
> + if (pg == 0) {
> + fprintf(stderr, "No guest physical page available, "
> + "paddr_min: 0x%lx page_size: 0x%x memslot: %u\n",
> + paddr_min, vm->page_size, memslot);
> + fputs("---- vm dump ----\n", stderr);
> + vm_dump(stderr, vm, 2);
> + abort();
> + }
> +
> + for (pg = base; pg < base + num; ++pg)
> + sparsebit_clear(region->unused_phy_pages, pg);
> +
> + return base * vm->page_size;
> +}
> +
> +vm_paddr_t vm_phy_page_alloc(struct kvm_vm *vm, vm_paddr_t paddr_min,
> + uint32_t memslot)
> +{
> + return vm_phy_pages_alloc(vm, 1, paddr_min, memslot);
> +}
> +
> +/* Arbitrary minimum physical address used for virtual translation tables. */
> +#define KVM_GUEST_PAGE_TABLE_MIN_PADDR 0x180000
> +
> +vm_paddr_t vm_alloc_page_table(struct kvm_vm *vm)
> +{
> + return vm_phy_page_alloc(vm, KVM_GUEST_PAGE_TABLE_MIN_PADDR, 0);
> +}
> +
> /*
> * VM Virtual Address Unused Gap
> *
> @@ -2149,79 +2222,6 @@ const char *exit_reason_str(unsigned int exit_reason)
> return "Unknown";
> }
>
> -/*
> - * Physical Contiguous Page Allocator
> - *
> - * Input Args:
> - * vm - Virtual Machine
> - * num - number of pages
> - * paddr_min - Physical address minimum
> - * memslot - Memory region to allocate page from
> - *
> - * Output Args: None
> - *
> - * Return:
> - * Starting physical address
> - *
> - * Within the VM specified by vm, locates a range of available physical
> - * pages at or above paddr_min. If found, the pages are marked as in use
> - * and their base address is returned. A TEST_ASSERT failure occurs if
> - * not enough pages are available at or above paddr_min.
> - */
> -vm_paddr_t vm_phy_pages_alloc(struct kvm_vm *vm, size_t num,
> - vm_paddr_t paddr_min, uint32_t memslot)
> -{
> - struct userspace_mem_region *region;
> - sparsebit_idx_t pg, base;
> -
> - TEST_ASSERT(num > 0, "Must allocate at least one page");
> -
> - TEST_ASSERT((paddr_min % vm->page_size) == 0, "Min physical address "
> - "not divisible by page size.\n"
> - " paddr_min: 0x%lx page_size: 0x%x",
> - paddr_min, vm->page_size);
> -
> - region = memslot2region(vm, memslot);
> - base = pg = paddr_min >> vm->page_shift;
> -
> - do {
> - for (; pg < base + num; ++pg) {
> - if (!sparsebit_is_set(region->unused_phy_pages, pg)) {
> - base = pg = sparsebit_next_set(region->unused_phy_pages, pg);
> - break;
> - }
> - }
> - } while (pg && pg != base + num);
> -
> - if (pg == 0) {
> - fprintf(stderr, "No guest physical page available, "
> - "paddr_min: 0x%lx page_size: 0x%x memslot: %u\n",
> - paddr_min, vm->page_size, memslot);
> - fputs("---- vm dump ----\n", stderr);
> - vm_dump(stderr, vm, 2);
> - abort();
> - }
> -
> - for (pg = base; pg < base + num; ++pg)
> - sparsebit_clear(region->unused_phy_pages, pg);
> -
> - return base * vm->page_size;
> -}
> -
> -vm_paddr_t vm_phy_page_alloc(struct kvm_vm *vm, vm_paddr_t paddr_min,
> - uint32_t memslot)
> -{
> - return vm_phy_pages_alloc(vm, 1, paddr_min, memslot);
> -}
> -
> -/* Arbitrary minimum physical address used for virtual translation tables. */
> -#define KVM_GUEST_PAGE_TABLE_MIN_PADDR 0x180000
> -
> -vm_paddr_t vm_alloc_page_table(struct kvm_vm *vm)
> -{
> - return vm_phy_page_alloc(vm, KVM_GUEST_PAGE_TABLE_MIN_PADDR, 0);
> -}
> -
> /*
> * Address Guest Virtual to Host Virtual
> *
> --
> 2.25.1
>
Why move the function implementation? Maybe just adding a declaration
at the top of kvm_util.c should suffice.
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