[RFC kvmtool 19/31] arm64: Don't try to set PSTATE for VCPUs belonging to a realm

[Suzuki K Poulose]

From: Christoffer Dall <christoffer.dall at arm.com>

RME doesn't allow setting the PSTATE but resets it to an architectural
value, and KVM also does not allow setting this register from user
space, so stop trying to do that.

Signed-off-by: Christoffer Dall <christoffer.dall at arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei at arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
---
 arm/aarch64/kvm-cpu.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/arm/aarch64/kvm-cpu.c b/arm/aarch64/kvm-cpu.c
index e7649239..37f9aa9d 100644
--- a/arm/aarch64/kvm-cpu.c
+++ b/arm/aarch64/kvm-cpu.c
@@ -92,11 +92,13 @@ static void reset_vcpu_aarch64(struct kvm_cpu *vcpu)
 
 	reg.addr = (u64)&data;
 
-	/* pstate = all interrupts masked */
-	data	= PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | PSR_MODE_EL1h;
-	reg.id	= ARM64_CORE_REG(regs.pstate);
-	if (ioctl(vcpu->vcpu_fd, KVM_SET_ONE_REG, &reg) < 0)
-		die_perror("KVM_SET_ONE_REG failed (spsr[EL1])");
+	if (!kvm->cfg.arch.is_realm) {
+		/* pstate = all interrupts masked */
+		data	= PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | PSR_MODE_EL1h;
+		reg.id	= ARM64_CORE_REG(regs.pstate);
+		if (ioctl(vcpu->vcpu_fd, KVM_SET_ONE_REG, &reg) < 0)
+			die_perror("KVM_SET_ONE_REG failed (PSTATE)");
+	}
 
 	/* x1...x3 = 0 */
 	data	= 0;
-- 
2.34.1