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Author SHA1 Message Date
Rajnesh Kanwal cf08d74c26 target/riscv: Fix VS mode interrupts forwarding. 
Currently riscv_cpu_local_irq_pending is used to find out pending
interrupt and VS mode interrupts are being shifted to represent
S mode interrupts in this function. So when the cause returned by
this function is passed to riscv_cpu_do_interrupt to actually
forward the interrupt, the VS mode forwarding check does not work
as intended and interrupt is actually forwarded to hypervisor. This
patch fixes this issue.

Backports commit c5969a3a3c2cb9ea02ffb7e86acb059d3cf8c264 from qemu
 2020-04-30 06:21:03 -04:00
Alistair Francis 1001f0ba1f target/riscv: Correctly implement TSR trap 
As reported in: https://bugs.launchpad.net/qemu/+bug/1851939 we weren't
correctly handling illegal instructions based on the value of MSTATUS_TSR
and the current privledge level.

This patch fixes the issue raised in the bug by raising an illegal
instruction if TSR is set and we are in S-Mode.

Backports commit ed5abf46b3c414ef58e647145f19b3966700b206 from qemu
 2020-04-30 06:19:49 -04:00
Richard Henderson 6c8172fd08 target/arm: Disable clean_data_tbi for system mode 
We must include the tag in the FAR_ELx register when raising
an addressing exception. Which means that we should not clear
out the tag during translation.

We cannot at present comply with this for user mode, so we
retain the clean_data_tbi function for the moment, though it
no longer does what it says on the tin for system mode. This
function is to be replaced with MTE, so don't worry about the
slight misnaming.

Buglink: https://bugs.launchpad.net/qemu/+bug/1867072

Backports commit 38d931687fa196a7ef860f8583815abc7fd5521a from qemu
 2020-04-30 06:18:31 -04:00
Richard Henderson e040675fbf target/arm: Clean address for DC ZVA 
This data access was forgotten when we added support for cleaning
addresses of TBI information.

Fixes: 3a471103ac1823ba

Backports commit 597d61a3b1f94c53a3aaa77671697c0c5f797dbf from qemu.
 2020-04-30 06:16:03 -04:00
Richard Henderson a37d9b2be5 target/arm: Use DEF_HELPER_FLAGS for helper_dc_zva 
The function does not write registers, and only reads them by
implication via the exception path.

Backports commit 1371b02c5a060e423e70560dbca769b54e471ba9 from qemu
 2020-04-30 06:14:45 -04:00
Richard Henderson 3cb68bc44e target/arm: Move helper_dc_zva to helper-a64.c 
This is an aarch64-only function. Move it out of the shared file.
This patch is code movement only.

Backports commit 7b182eb2467af6c47c9c77c64bbbeed8ed53c330 from qemu
 2020-04-30 06:12:26 -04:00
Richard Henderson a22a2a8b71 target/arm: Introduce core_to_aa64_mmu_idx 
If by context we know that we're in AArch64 mode, we need not
test for M-profile when reconstructing the full ARMMMUIdx.

Backports commit 20dc67c947a691fa9df05e76aec6df50204b4b94 from qemu
 2020-04-30 05:58:59 -04:00
Richard Henderson d3a5843aeb target/arm: Replicate TBI/TBID bits for single range regimes 
Replicate the single TBI bit from TCR_EL2 and TCR_EL3 so that
we can unconditionally use pointer bit 55 to index into our
composite TBI1:TBI0 field.

Backports commit 3e270f67f0f05277021763af119a6ce195f8ed51 from qemu
 2020-04-30 05:58:59 -04:00
Richard Henderson cc32a96183 target/arm: Honor the HCR_EL2.TTLB bit 
This bit traps EL1 access to tlb maintenance insns.

Backports commit 30881b7353b5bb41210c32cd8e00421da757808c from qemu
 2020-04-30 05:58:59 -04:00
Richard Henderson 74d6aa6012 target/arm: Honor the HCR_EL2.TPU bit 
This bit traps EL1 access to cache maintenance insns that operate
to the point of unification. There are no longer any references to
plain aa64_cacheop_access, so remove it.

Backports commit 38262d8a732f8bd0e9ca3dc064f6e73d00c08b9a from qemu
 2020-04-30 05:58:59 -04:00
Mat M 8889cc9af8
Merge pull request #21 from MerryMage/master 
header_gen: Add gen_{u,s}shl_i{32,64} to arm
 2020-04-13 15:16:38 -04:00
MerryMage f9b909f529 header_gen: Add gen_{u,s}shl_i{32,64} to arm 2020-04-13 19:38:59 +01:00
Richard Henderson f35a83d5ff target/arm: Honor the HCR_EL2.TPCP bit 
This bit traps EL1 access to cache maintenance insns that operate
to the point of coherency or persistence.

Backports commit 1bed4d2e55459129c19f5952bcfc65bd0c70db5b from qemu
 2020-03-22 02:44:41 -04:00
Richard Henderson 8ff8ff0c4a target/arm: Honor the HCR_EL2.TACR bit 
This bit traps EL1 access to the auxiliary control registers.

Backports commit 9960237769ada2faaaf1898b96da7a55e1691cf4 from qemu
 2020-03-22 02:42:05 -04:00
Richard Henderson d252af2069 target/arm: Honor the HCR_EL2.TSW bit 
These bits trap EL1 access to set/way cache maintenance insns.

Backports commit 1803d2713b29d85031cc964d545036bda9880f26 from qemu
 2020-03-22 02:40:10 -04:00
Richard Henderson 7ee27e5d93 target/arm: Honor the HCR_EL2.{TVM,TRVM} bits 
These bits trap EL1 access to various virtual memory controls.

Backports commit 84929218512c19ec9a296fbfd7b39219e0c592ae from qemu
 2020-03-22 02:38:03 -04:00
Richard Henderson 7cd75be7c8 target/arm: Improve masking in arm_hcr_el2_eff 
Update the {TGE,E2H} == '11' masking to ARMv8.6.
If EL2 is configured for aarch32, disable all of
the bits that are RES0 in aarch32 mode.

Backports commit 4990e1d3c128580dd2fa0bbb1a42b6d63ba1ac28 from qemu
 2020-03-22 02:32:35 -04:00
Richard Henderson fa599a9538 target/arm: Add HCR_EL2 bit definitions from ARMv8.6 
Backports commit e0a38bb35aa930c2d3b9982914297f0c0e8fd5c8 from qemu
 2020-03-22 02:31:19 -04:00
Richard Henderson c4b2493c2e target/arm: Improve masking of HCR/HCR2 RES0 bits 
Don't merely start with v8.0, handle v7VE as well. Ensure that writes
from aarch32 mode do not change bits in the other half of the register.
Protect reads of aa64 id registers with ARM_FEATURE_AARCH64.

Backports commit d1fb4da208411ce7b3dafb9f9e7726ebcec14edb from qemu
 2020-03-22 02:28:41 -04:00
Peter Maydell 32b0e506e6 target/arm: Implement (trivially) ARMv8.2-TTCNP 
The ARMv8.2-TTCNP extension allows an implementation to optimize by
sharing TLB entries between multiple cores, provided that software
declares that it's ready to deal with this by setting a CnP bit in
the TTBRn_ELx. It is mandatory from ARMv8.2 onward.

For QEMU's TLB implementation, sharing TLB entries between different
cores would not really benefit us and would be a lot of work to
implement. So we implement this extension in the "trivial" manner:
we allow the guest to set and read back the CnP bit, but don't change
our behaviour (this is an architecturally valid implementation
choice).

The only code path which looks at the TTBRn_ELx values for the
long-descriptor format where the CnP bit is defined is already doing
enough masking to not get confused when the CnP bit at the bottom of
the register is set, so we can simply add a comment noting why we're
relying on that mask.

Backports commit 41a4bf1feab098da4cd5495cd56a99b0339e2275 from qemu
 2020-03-22 02:24:48 -04:00
Anup Patel d47390ade4 target/riscv: Emulate TIME CSRs for privileged mode 
Currently, TIME CSRs are emulated only for user-only mode. This
patch add TIME CSRs emulation for privileged mode.

For privileged mode, the TIME CSRs will return value provided
by rdtime callback which is registered by QEMU machine/platform
emulation (i.e. CLINT emulation). If rdtime callback is not
available then the monitor (i.e. OpenSBI) will trap-n-emulate
TIME CSRs in software.

We see 25+% performance improvement in hackbench numbers when
TIME CSRs are not trap-n-emulated.

Backports commit c695724868ce4049fd79c5a509880dbdf171e744 from qemu
 2020-03-22 02:22:17 -04:00
Alistair Francis 6c3338430a target/riscv: Add the MSTATUS_MPV_ISSET helper macro 
Add a helper macro MSTATUS_MPV_ISSET() which will determine if the
MSTATUS_MPV bit is set for both 32-bit and 64-bit RISC-V.

Backports commit e44b50b5b2e508fdd24915ab0e44ac49685e1de3 from qemu
 2020-03-22 02:18:02 -04:00
Alistair Francis 835b025692 target/riscv: Add support for the 32-bit MSTATUSH CSR 
Backports commit 551fa7e8a695ea5fd1cca8ffd318556855bbf54f from qemu
 2020-03-22 02:16:13 -04:00
Alistair Francis 63d5b37ebc target/riscv: Set htval and mtval2 on execptions 
Backports commit 3067553993ae986b76a92df8a978778134ecdc84 from qemu
 2020-03-22 02:13:07 -04:00
Alistair Francis 141c47a286 target/riscv: Raise the new execptions when 2nd stage translation fails 
Backports commit b2ef6ab9fee6948cf016f9e741feecdfb333fcbe from qemu
 2020-03-22 02:08:53 -04:00
Alistair Francis 773757a919 target/riscv: Implement second stage MMU 
Backports commit 36a18664bafcfafa5e997b47458387f6fe53d537 from qemu
 2020-03-22 02:07:49 -04:00
Alistair Francis e350bd6f85 target/riscv: Allow specifying MMU stage 
Backports commit 1448689c7b23690f49a4cce248c6e4ac973d37b8 from qemu
 2020-03-22 01:56:41 -04:00
Alistair Francis 74b8fd51f4 target/riscv: Respect MPRV and SPRV for floating point ops 
mark_fs_dirty() is the only place in translate.c that uses the
virt_enabled bool. Let's respect the contents of MSTATUS.MPRV and
HSTATUS.SPRV when setting the bool as this is used for performing
floating point operations when V=0.

Backports commit ae84dd0ab7eaf7e98cd6ee05b2063cce8ff9bc02 from qemu
 2020-03-22 01:54:06 -04:00
Alistair Francis 270808e22e target/riscv: Mark both sstatus and msstatus_hs as dirty 
Mark both sstatus and vsstatus as dirty (3).

Backports commit 45b4dc8b403aa5473ec015336adf7d14d88e85c5 from qemu
 2020-03-22 01:51:41 -04:00
Alistair Francis 347ad87e98 target/riscv: Disable guest FP support based on virtual status 
When the Hypervisor extension is in use we only enable floating point
support when both status and vsstatus have enabled floating point
support.

Backports commit 29409c1d921d607873268671bf11a088efb5558e from qemu
 2020-03-22 01:49:05 -04:00
Alistair Francis 0d488f3a76 target/riscv: Only set TB flags with FP status if enabled 
Backports commit e28eaed87902c5e852c3ed043b27204e879aa4e2 from qemu
 2020-03-22 01:45:32 -04:00
Alistair Francis 1e17cbc52c target/riscv: Remove the hret instruction 
The hret instruction does not exist in the new spec versions, so remove
it from QEMU.

Backports commit 0736febb2d0e1bb503ca07091c16a16e78480366 from qemu
 2020-03-22 01:44:55 -04:00
Alistair Francis 13a7b74827 target/riscv: Add hfence instructions 
Backports commit 895c412cb6e79b7b08bd3c2d2fcb70a3cab6ff8a from qemu
 2020-03-22 01:43:53 -04:00
Alistair Francis fcc30eac4d target/riscv: Add Hypervisor trap return support 
Backports commit e3fba4bab668a41f7cec6405c5aeb21497bd7c83 from qemu
 2020-03-22 01:41:58 -04:00
Alistair Francis 3e3bdf836b target/riscv: Add hypvervisor trap support 
Backports commit 5eb9e782f523d2898e2dacd86c6e41365dae74b3 from qemu
 2020-03-22 01:40:06 -04:00
Alistair Francis f6b14e146e target/riscv: Generate illegal instruction on WFI when V=1 
Backports commit 9d0d11269671646be7475cc01142e9d3ed8ae59c from qemu
 2020-03-22 01:38:14 -04:00
Alistair Francis 4af0dc9a7e target/ricsv: Flush the TLB on virtulisation mode changes 
To ensure our TLB isn't out-of-date we flush it on all virt mode
changes. Unlike priv mode this isn't saved in the mmu_idx as all
guests share V=1. The easiest option is just to flush on all changes.

Backports commit eccc5a12c2fd1c646c69a1e7de29183b7a559973 from qemu
 2020-03-22 01:37:19 -04:00
Alistair Francis 5adba06c29 target/riscv: Add support for virtual interrupt setting 
Backports commit 3ef10a098b0d3ebb02bf8e1325adc3b77af92f0b from qemu
 2020-03-22 01:36:28 -04:00
Alistair Francis 4e7aaee31a target/riscv: Extend the SIP CSR to support virtulisation 
Backports commit a2e9f57d06279220b1834eca2494e52adae121b8 from qemu
 2020-03-22 01:35:11 -04:00
Alistair Francis 1fd49ac6f0 target/riscv: Extend the MIE CSR to support virtulisation 
Backports commit d0e53ce33ec8f66ffa597c634d50be73264aeadb from qemu
 2020-03-22 01:33:17 -04:00
Alistair Francis 6aabd67ef8 target/riscv: Set VS bits in mideleg for Hyp extension 
Backports commit 713d8363deb3774db14fb88a9fcd99687dcef114 from qemu
 2020-03-22 01:32:12 -04:00
Alistair Francis ebc7b9371f target/riscv: Add virtual register swapping function 
Backports commit 66e594f2800ddc55f908830bf9e8dc4cda1304fe from qemu
 2020-03-22 01:30:22 -04:00
Alistair Francis 042e3df075 target/riscv: Add Hypervisor machine CSRs accesses 
Backports commit 34cfb5f61842d495c6f6fc3eeb4197b5b44fd570 from qemu
 2020-03-22 01:26:47 -04:00
Alistair Francis dd356201a6 target/riscv: Add Hypervisor virtual CSRs accesses 
Backports commit 8747c9eeb2aaec8441d0900b198725ab33af4951 from qemu
 2020-03-22 01:24:42 -04:00
Alistair Francis 221c427fc3 target/riscv: Add Hypervisor CSR access functions 
Backports commit ff2cc1294cd8179d87de299b8e7a16bdb1e69523 from qemu
 2020-03-22 01:22:58 -04:00
Alistair Francis e4e41d3d87 target/riscv: Fix CSR perm checking for HS mode 
Update the CSR permission checking to work correctly when we are in
HS-mode.

Backports commit 0a42f4c4408824dc7cb9ff60c9bdce6dcc0d24a5 from qemu
 2020-03-22 01:19:04 -04:00
Alistair Francis ab7c1570d8 target/riscv: Add the force HS exception mode 
Add a FORCE_HS_EXCEP mode to the RISC-V virtulisation status. This bit
specifies if an exeption should be taken to HS mode no matter the
current delegation status. This is used when an exeption must be taken
to HS mode, such as when handling interrupts.

Backports commit c7b1bbc80fc2af17395d3986c346fd2307e57829 from qemu
 2020-03-22 01:16:55 -04:00
Alistair Francis 95537388c5 target/riscv: Add the virtulisation mode 
Backports commit ef6bb7b62682badefdcb744831510aaa5971684f from qemu
 2020-03-22 01:15:06 -04:00
Alistair Francis fa04e7ea45 target/riscv: Rename the H irqs to VS irqs 
Backports commit 205377f8940898e4c53d1b44350a3d4934a2da72 from qemu
 2020-03-22 01:09:04 -04:00
Alistair Francis 0198a09698 target/riscv: Add support for the new execption numbers 
The v0.5 Hypervisor spec add new execption numbers, let's add support
for those.

Backports commit ab67a1d07a4f6f1b4d577c5c47013273b9804551 from qemu
 2020-03-22 01:07:23 -04:00