On Mon, 2025-08-25 at 15:20 +0000, Nikunj A Dadhania wrote: > When HvInUseWrAllowed (CPUID 8000001F EAX[30]) is supported, the CPU allows > hypervisor writes to in-use pages without RMP violations, making the 2MB > alignment workaround unnecessary. Check for this capability to avoid the > allocation overhead when it's not needed. Could you add some text to explain why this is related to PML? > > Suggested-by: Tom Lendacky <thomas.lendacky@xxxxxxx> > Signed-off-by: Nikunj A Dadhania <nikunj@xxxxxxx> > --- > arch/x86/kvm/svm/sev.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c > index 2fbdebf79fbb..c5477efc90b9 100644 > --- a/arch/x86/kvm/svm/sev.c > +++ b/arch/x86/kvm/svm/sev.c > @@ -4666,7 +4666,8 @@ struct page *snp_safe_alloc_page_node(int node, gfp_t gfp) > unsigned long pfn; > struct page *p; > > - if (!cc_platform_has(CC_ATTR_HOST_SEV_SNP)) > + if (!cc_platform_has(CC_ATTR_HOST_SEV_SNP) || > + cpu_feature_enabled(X86_FEATURE_HV_INUSE_WR_ALLOWED)) > return alloc_pages_node(node, gfp | __GFP_ZERO, 0); > > /*
