[PATCH v2 01/15] KVM: arm64: add {read, write}_sysreg_elx_s versions for new registers
From: Sudeep Holla <hidden>
Date: 2019-05-23 10:36:43
Also in:
kvm, kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
KVM provides {read,write}_sysreg_el1() to write to ${REG}_EL1 when we
really want to read/write to the EL1 register without any VHE register
redirection.
SPE registers are not supported by many versions of GAS. For this reason
we mostly use mrs_s macro which takes sys_reg() representation.
However these SPE registers using sys_reg representation doesn't work
well with existing {read,write}_sysreg_el1 macros. We need to add
{read,write}_sysreg_el1_s versions so cope up with them.
Signed-off-by: Sudeep Holla <redacted>
---
arch/arm64/include/asm/kvm_hyp.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index 09fe8bd15f6e..f61378b77c9f 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h@@ -35,6 +35,15 @@ : "=r" (reg)); \ reg; \ }) +#define read_sysreg_elx_s(r,nvh,vh) \ + ({ \ + u64 reg; \ + asm volatile(ALTERNATIVE(__mrs_s("%0", r##nvh), \ + __mrs_s("%0", r##vh), \ + ARM64_HAS_VIRT_HOST_EXTN) \ + : "=r" (reg)); \ + reg; \ + }) #define write_sysreg_elx(v,r,nvh,vh) \ do { \
@@ -44,6 +53,14 @@ ARM64_HAS_VIRT_HOST_EXTN) \ : : "rZ" (__val)); \ } while (0) +#define write_sysreg_elx_s(v,r,nvh,vh) \ + do { \ + u64 __val = (u64)(v); \ + asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"), \ + __msr_s(r##vh, "%x0"), \ + ARM64_HAS_VIRT_HOST_EXTN) \ + : : "rZ" (__val)); \ + } while (0) /* * Unified accessors for registers that have a different encoding
@@ -72,7 +89,9 @@ #define read_sysreg_el0(r) read_sysreg_elx(r, _EL0, _EL02) #define write_sysreg_el0(v,r) write_sysreg_elx(v, r, _EL0, _EL02) #define read_sysreg_el1(r) read_sysreg_elx(r, _EL1, _EL12) +#define read_sysreg_el1_s(r) read_sysreg_elx_s(r, _EL1, _EL12) #define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12) +#define write_sysreg_el1_s(v,r) write_sysreg_elx_s(v, r, _EL1, _EL12) /* The VHE specific system registers and their encoding */ #define sctlr_EL12 sys_reg(3, 5, 1, 0, 0)
--
2.17.1
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