提交 1f7e378d 编写于 作者: M Marc Zyngier 提交者: Christoffer Dall

arm: KVM: Preserve pending Virtual Abort in world switch

The HCR.VA bit is used to signal an Abort to a guest, and has
the peculiar feature of getting cleared when the guest has taken
the abort (this is the only bit that behaves as such in this register).

This means that if we signal such an abort, we must leave it in
the guest context until it disappears from HCR, and at which point
it must be cleared from the context.
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>
上级 395ea79e
......@@ -54,6 +54,15 @@ static void __hyp_text __deactivate_traps(struct kvm_vcpu *vcpu)
{
u32 val;
/*
* If we pended a virtual abort, preserve it until it gets
* cleared. See B1.9.9 (Virtual Abort exception) for details,
* but the crucial bit is the zeroing of HCR.VA in the
* pseudocode.
*/
if (vcpu->arch.hcr & HCR_VA)
vcpu->arch.hcr = read_sysreg(HCR);
write_sysreg(0, HCR);
write_sysreg(0, HSTR);
val = read_sysreg(HDCR);
......
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