diff mbox series

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

Message ID 20230127113932.166089-20-suzuki.poulose@arm.com (mailing list archive)
State New, archived
Headers show
Series arm64: Support for Arm Confidential Compute Architecture | expand

Commit Message

Suzuki K Poulose Jan. 27, 2023, 11:39 a.m. UTC 
From: Christoffer Dall <christoffer.dall@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@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 arm/aarch64/kvm-cpu.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)
diff mbox series

Patch

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;