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Suzuki K Poulose eeba4e4cc5 KVM: arm64: nvhe: Save the SPE context early 
commit b96b0c5de6 upstream.

The nVHE KVM hyp drains and disables the SPE buffer, before
entering the guest, as the EL1&0 translation regime
is going to be loaded with that of the guest.

But this operation is performed way too late, because :
  - The owning translation regime of the SPE buffer
    is transferred to EL2. (MDCR_EL2_E2PB == 0)
  - The guest Stage1 is loaded.

Thus the flush could use the host EL1 virtual address,
but use the EL2 translations instead of host EL1, for writing
out any cached data.

Fix this by moving the SPE buffer handling early enough.
The restore path is doing the right thing.

Fixes: 014c4c77aa ("KVM: arm64: Improve debug register save/restore flow")
Cc: stable@vger.kernel.org
Cc: Christoffer Dall <christoffer.dall@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210302120345.3102874-1-suzuki.poulose@arm.com
Message-Id: <20210305185254.3730990-2-maz@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-17 17:06:36 +01:00
..
boot Revert "arm64: dts: amlogic: add missing ethernet reset ID" 2021-03-09 11:11:15 +01:00
configs arm64: defconfig: Build in CONFIG_GPIO_MXC by default 2020-10-26 15:48:58 +08:00
crypto crypto: arm64/sha - add missing module aliases 2021-03-04 11:38:31 +01:00
include KVM: arm64: nvhe: Save the SPE context early 2021-03-17 17:06:36 +01:00
kernel arm64: mm: use a 48-bit ID map when possible on 52-bit VA builds 2021-03-17 17:06:34 +01:00
kvm KVM: arm64: nvhe: Save the SPE context early 2021-03-17 17:06:36 +01:00
lib arm64: Change .weak to SYM_FUNC_START_WEAK_PI for arch/arm64/lib/mem*.S 2020-10-30 08:32:31 +00:00
mm arm64: mm: use a 48-bit ID map when possible on 52-bit VA builds 2021-03-17 17:06:34 +01:00
net arm64: bpf: Fix branch offset in JIT 2020-09-17 12:05:36 +01:00
xen
Kbuild
Kconfig arm64: Make CPU_BIG_ENDIAN depend on ld.bfd or ld.lld 13.0.0+ 2021-03-11 14:17:22 +01:00
Kconfig.debug arm64: remove TEXT_OFFSET randomization 2020-06-15 13:10:59 +01:00
Kconfig.platforms arm64: berlin: Select DW_APB_TIMER_OF 2020-10-26 10:45:03 +01:00
Makefile arm64: link with -z norelro for LLD or aarch64-elf 2021-01-12 20:18:24 +01:00