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Pkvm v6.18 helpers #54

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Merged
cxdong merged 8 commits into from
Jan 5, 2026
Merged

Pkvm v6.18 helpers #54

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6801643
SQUASHME: pKVM: x86: Introduce for_each_pkvm_page() helper
Jan 2, 2026
0c43de7
SQUASHME: pKVM: x86: Use for_each_pkvm_page() in check_host_mem_pgsta…
Jan 2, 2026
96bcb1c
SQUASHME: pKVM: x86: Use for_each_pkvm_page() in pkvm_host_share/unsh…
Jan 2, 2026
1a73a0a
SQUASHME: pKVM: x86: Introduce pkvm_pgtable_max_size()
Jan 2, 2026
16d50f5
SQUASHME: pKVM: x86: Use pkvm_pgtable_max_size() in fix_host_mmu_pgst…
Jan 2, 2026
1fbd57c
SQUASHME: pKVM: x86: Introduce host_mmu_pte_prot()
Jan 2, 2026
ba89385
SQUASHME: pKVM: x86: Use host_mmu_pte_prot() in pkvm_hyp_donate_host_…
Jan 2, 2026
1684116
SQUASHME: pKVM: x86: Use host_mmu_pte_prot() in host_mmu_map()
Jan 2, 2026
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6 changes: 6 additions & 0 deletions arch/x86/kvm/pkvm/memory.h
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,12 @@ extern u64 __pkvm_vmemmap;
#define pkvm_page_to_virt(page) __pkvm_va(pkvm_page_to_phys(page))
#define pkvm_page_to_pool(page) (((struct pkvm_page *)page)->pool)

/* Caution: __st is evaluated twice. */
#define for_each_pkvm_page(__p, __st, __sz) \
for (struct pkvm_page *__p = pkvm_phys_to_page(PAGE_ALIGN_DOWN(__st)), \
*__e = pkvm_phys_to_page(PAGE_ALIGN((__st) + (__sz))); \
__p < __e; __p++)

/*
* Refcounting for 'struct pkvm_page'.
* pkvm_pool::lock must be held if atomic access to the refcount is required.
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7 changes: 1 addition & 6 deletions arch/x86/kvm/pkvm/mmu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -190,13 +190,8 @@ static int fix_hyp_mmu_page_refcnt(void)
static void set_host_mem_pgstate(unsigned long phys, unsigned long size,
enum pkvm_page_state pgstate)
{
unsigned long end = PAGE_ALIGN(phys + size);
struct pkvm_page *page;

for (phys = PAGE_ALIGN_DOWN(phys); phys < end; phys += PAGE_SIZE) {
page = pkvm_phys_to_page(phys);
for_each_pkvm_page(page, phys, size)
page->host_state = pgstate;
}
}

static int check_host_mem_pgstate(unsigned long phys, unsigned long size,
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