From: Marc Zyngier <maz@kernel.org>
To: Quentin Perret <qperret@google.com>
Cc: catalin.marinas@arm.com, james.morse@arm.com,
julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com,
android-kvm@google.com, seanjc@google.com, mate.toth-pal@arm.com,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, kernel-team@android.com,
kvmarm@lists.cs.columbia.edu, tabba@google.com, ardb@kernel.org,
mark.rutland@arm.com, dbrazdil@google.com
Subject: [PATCH 1/3] KVM: arm64: Constraint KVM's own __flush_dcache_area to protectected mode
Date: Mon, 22 Mar 2021 16:48:26 +0000 [thread overview]
Message-ID: <20210322164828.800662-2-maz@kernel.org> (raw)
In-Reply-To: <20210322164828.800662-1-maz@kernel.org>
As we are about to specialise KVM's version of __flush_dcache_area
via a hack opn the read_ctr macro, make sure that we won't ever
use KVM's copy of __flush_dcache_area(), as things would otherwise
break for late arriving CPUs.
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/kvm/hyp/nvhe/cache.S | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm64/kvm/hyp/nvhe/cache.S b/arch/arm64/kvm/hyp/nvhe/cache.S
index 36cef6915428..1c177d3ec5c6 100644
--- a/arch/arm64/kvm/hyp/nvhe/cache.S
+++ b/arch/arm64/kvm/hyp/nvhe/cache.S
@@ -6,8 +6,12 @@
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/alternative.h>
+#include <asm/asm-bug.h>
SYM_FUNC_START_PI(__flush_dcache_area)
+alternative_if_not ARM64_KVM_PROTECTED_MODE
+ ASM_BUG()
+alternative_else_nop_endif
dcache_by_line_op civac, sy, x0, x1, x2, x3
ret
SYM_FUNC_END_PI(__flush_dcache_area)
--
2.29.2
next prev parent reply other threads:[~2021-03-22 16:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-22 16:48 [PATCH 0/3] KVM:arm64: Proposed host stage-2 improvements Marc Zyngier
2021-03-22 16:48 ` Marc Zyngier [this message]
2021-03-22 16:48 ` [PATCH 2/3] KVM: arm64: Generate final CTR_EL0 value when running in Protected mode Marc Zyngier
2021-03-22 17:40 ` Quentin Perret
2021-03-22 18:37 ` Marc Zyngier
2021-03-23 9:47 ` Quentin Perret
2021-03-22 16:48 ` [PATCH 3/3] KVM: arm64: Drop the CPU_FTR_REG_HYP_COPY infrastructure Marc Zyngier
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