linux-kernel - [PATCH v9 06/11] KVM: selftests: Explicitly ucall pool from shared memory

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Message-ID: <20240223004258.3104051-7-seanjc@google.com>
Date: Thu, 22 Feb 2024 16:42:53 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>, 
	Oliver Upton <oliver.upton@...ux.dev>, Anup Patel <anup@...infault.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Christian Borntraeger <borntraeger@...ux.ibm.com>, 
	Janosch Frank <frankja@...ux.ibm.com>, Claudio Imbrenda <imbrenda@...ux.ibm.com>, 
	Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	kvmarm@...ts.linux.dev, kvm-riscv@...ts.infradead.org, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Vishal Annapurve <vannapurve@...gle.com>, Ackerley Tng <ackerleytng@...gle.com>, 
	Andrew Jones <andrew.jones@...ux.dev>, Tom Lendacky <thomas.lendacky@....com>, 
	Michael Roth <michael.roth@....com>, Carlos Bilbao <carlos.bilbao@....com>, 
	Peter Gonda <pgonda@...gle.com>, Itaru Kitayama <itaru.kitayama@...itsu.com>
Subject: [PATCH v9 06/11] KVM: selftests: Explicitly ucall pool from shared memory

From: Peter Gonda <pgonda@...gle.com>

Allocate the common ucall pool using vm_vaddr_alloc_shared() so that the
ucall structures will be placed in shared (unencrypted) memory for VMs
with support for protected (encrypted) memory, e.g. x86's SEV.

Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Sean Christopherson <seanjc@...gle.com>
Cc: Vishal Annapurve <vannapurve@...gle.com>
Cc: Ackerly Tng <ackerleytng@...gle.com>
cc: Andrew Jones <andrew.jones@...ux.dev>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: Michael Roth <michael.roth@....com>
Tested-by: Carlos Bilbao <carlos.bilbao@....com>
Signed-off-by: Peter Gonda <pgonda@...gle.com>
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/lib/ucall_common.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/lib/ucall_common.c b/tools/testing/selftests/kvm/lib/ucall_common.c
index 816a3fa109bf..f5af65a41c29 100644
--- a/tools/testing/selftests/kvm/lib/ucall_common.c
+++ b/tools/testing/selftests/kvm/lib/ucall_common.c
@@ -29,7 +29,8 @@ void ucall_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa)
 	vm_vaddr_t vaddr;
 	int i;
 
-	vaddr = __vm_vaddr_alloc(vm, sizeof(*hdr), KVM_UTIL_MIN_VADDR, MEM_REGION_DATA);
+	vaddr = vm_vaddr_alloc_shared(vm, sizeof(*hdr), KVM_UTIL_MIN_VADDR,
+				      MEM_REGION_DATA);
 	hdr = (struct ucall_header *)addr_gva2hva(vm, vaddr);
 	memset(hdr, 0, sizeof(*hdr));
 
-- 
2.44.0.rc0.258.g7320e95886-goog