github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-28 09:04:39 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

KVM: arm64: Seed pkvm_ownership_selftest vcpu memcache

Browse Source 
The hypercall handlers call pkvm_refill_memcache() to top up the
hyp_vcpu memcache before invoking __pkvm_host_{share,donate}_guest().
pkvm_ownership_selftest invokes those functions directly with a
static selftest_vcpu that has an empty memcache.

Seed selftest_vcpu's memcache from the prepopulated selftest
pages, leaving the remainder for selftest_vm.pool. Required by
the memcache-sufficiency pre-check added in the following
patches.

Assisted-by: Gemini:gemini-3.1-pro review-prompts
Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260501112149.2824881-5-tabba@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Fuad Tabba 2026-05-01 12:21:47 +01:00 committed by Marc Zyngier
parent d4d215e5b8
commit 5130d450d1
1 changed files with 15 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
arch/arm64/kvm/hyp/nvhe/pkvm.c
View File

@ -752,16 +752,30 @@ static struct pkvm_hyp_vcpu selftest_vcpu = {
struct pkvm_hyp_vcpu *init_selftest_vm(void *virt)
{
struct hyp_page *p = hyp_virt_to_page(virt);
unsigned long min_pages, seeded = 0;
int i;
selftest_vm.kvm.arch.mmu.vtcr = host_mmu.arch.mmu.vtcr;
WARN_ON(kvm_guest_prepare_stage2(&selftest_vm, virt));
/*
* Mirror pkvm_refill_memcache() for the share/donate pre-checks;
* the selftest invokes those functions directly and would
* otherwise see an empty memcache.
*/
min_pages = kvm_mmu_cache_min_pages(&selftest_vm.kvm.arch.mmu);
for (i = 0; i < pkvm_selftest_pages(); i++) {
if (p[i].refcount)
continue;
p[i].refcount = 1;
hyp_put_page(&selftest_vm.pool, hyp_page_to_virt(&p[i]));
if (seeded < min_pages) {
push_hyp_memcache(&selftest_vcpu.vcpu.arch.pkvm_memcache,
hyp_page_to_virt(&p[i]), hyp_virt_to_phys);
seeded++;
} else {
hyp_put_page(&selftest_vm.pool, hyp_page_to_virt(&p[i]));
}
}
selftest_vm.kvm.arch.pkvm.handle = __pkvm_reserve_vm();