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SubjectRe: [PATCH] KVM: MIPS: fix compilation
On Tue, Mar 31, 2020 at 11:47:49AM -0400, Paolo Bonzini wrote:
> Commit 31168f033e37 is correct that pud_index() & __pud_offset() are the same
> when pud_index() is actually provided, however it does not take into account
> the __PAGETABLE_PUD_FOLDED case. Provide kvm_pud_index so that MIPS KVM
> compiles.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> arch/mips/kvm/mmu.c | 18 ++++++++++++------
> 1 file changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
> index 7dad7a293eae..ccf98c22fd2c 100644
> --- a/arch/mips/kvm/mmu.c
> +++ b/arch/mips/kvm/mmu.c
> @@ -25,6 +25,12 @@
> #define KVM_MMU_CACHE_MIN_PAGES 2
> #endif
>
> +#if defined(__PAGETABLE_PUD_FOLDED)
> +#define kvm_pud_index(gva) 0
> +#else
> +#define kvm_pud_index(gva) pud_index(gva)
> +#endif
> +

I'd prefer simply making pud_index() always defined. When pud level is
folded asm-generic/pgtable-nopud.h will define PTRS_PER_PUD to 1 and
pud_index() will evaluate to 0 anyway.

diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h
index f92716cfa4f4..ee5dc0c145b9 100644
--- a/arch/mips/include/asm/pgtable-64.h
+++ b/arch/mips/include/asm/pgtable-64.h
@@ -172,6 +172,8 @@

extern pte_t invalid_pte_table[PTRS_PER_PTE];

+#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
+
#ifndef __PAGETABLE_PUD_FOLDED
/*
* For 4-level pagetables we defines these ourselves, for 3-level the
@@ -210,8 +212,6 @@ static inline void p4d_clear(p4d_t *p4dp)
p4d_val(*p4dp) = (unsigned long)invalid_pud_table;
}

-#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
-
static inline unsigned long p4d_page_vaddr(p4d_t p4d)
{
return p4d_val(p4d);
> static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
> int min, int max)
> {
> @@ -234,8 +240,8 @@ static bool kvm_mips_flush_gpa_pud(pud_t *pud, unsigned long start_gpa,
> {
> pmd_t *pmd;
> unsigned long end = ~0ul;
> - int i_min = pud_index(start_gpa);
> - int i_max = pud_index(end_gpa);
> + int i_min = kvm_pud_index(start_gpa);
> + int i_max = kvm_pud_index(end_gpa);
> bool safe_to_remove = (i_min == 0 && i_max == PTRS_PER_PUD - 1);
> int i;
>
> @@ -361,8 +367,8 @@ static int kvm_mips_##name##_pud(pud_t *pud, unsigned long start, \
> int ret = 0; \
> pmd_t *pmd; \
> unsigned long cur_end = ~0ul; \
> - int i_min = pud_index(start); \
> - int i_max = pud_index(end); \
> + int i_min = kvm_pud_index(start); \
> + int i_max = kvm_pud_index(end); \
> int i; \
> \
> for (i = i_min; i <= i_max; ++i, start = 0) { \
> @@ -896,8 +902,8 @@ static bool kvm_mips_flush_gva_pud(pud_t *pud, unsigned long start_gva,
> {
> pmd_t *pmd;
> unsigned long end = ~0ul;
> - int i_min = pud_index(start_gva);
> - int i_max = pud_index(end_gva);
> + int i_min = kvm_pud_index(start_gva);
> + int i_max = kvm_pud_index(end_gva);
> bool safe_to_remove = (i_min == 0 && i_max == PTRS_PER_PUD - 1);
> int i;
>
> --
> 2.18.2
>

--
Sincerely yours,
Mike.

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