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SubjectRe: [PATCH v3 08/12] KVM: arm64: re-factor hyp.S debug register code
On Thu, May 07, 2015 at 10:07:11AM +0100, Alex Bennée wrote:
> This is a pre-cursor to sharing the code with the guest debug support.
> This replaces the big macro that fishes data out of a fixed location
> with a more general helper macro to restore a set of debug registers. It
> uses macro substitution so it can be re-used for debug control and value
> registers. It does however rely on the debug registers being 64 bit
> aligned (as they happen to be in the hyp ABI).


>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>
> ---
> v3:
> - return to the patch series
> - add save and restore targets
> - change register use and document
>
> diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
> index dfb25a2..ce7b7dd 100644
> --- a/arch/arm64/kernel/asm-offsets.c
> +++ b/arch/arm64/kernel/asm-offsets.c
> @@ -116,6 +116,10 @@ int main(void)
> DEFINE(VCPU_FAR_EL2, offsetof(struct kvm_vcpu, arch.fault.far_el2));
> DEFINE(VCPU_HPFAR_EL2, offsetof(struct kvm_vcpu, arch.fault.hpfar_el2));
> DEFINE(VCPU_DEBUG_FLAGS, offsetof(struct kvm_vcpu, arch.debug_flags));
> + DEFINE(DEBUG_BCR, offsetof(struct kvm_guest_debug_arch, dbg_bcr));
> + DEFINE(DEBUG_BVR, offsetof(struct kvm_guest_debug_arch, dbg_bvr));
> + DEFINE(DEBUG_WCR, offsetof(struct kvm_guest_debug_arch, dbg_wcr));
> + DEFINE(DEBUG_WVR, offsetof(struct kvm_guest_debug_arch, dbg_wvr));
> DEFINE(VCPU_HCR_EL2, offsetof(struct kvm_vcpu, arch.hcr_el2));
> DEFINE(VCPU_MDCR_EL2, offsetof(struct kvm_vcpu, arch.mdcr_el2));
> DEFINE(VCPU_IRQ_LINES, offsetof(struct kvm_vcpu, arch.irq_lines));
> diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S
> index 15159aa..dd51fb1 100644
> --- a/arch/arm64/kvm/hyp.S
> +++ b/arch/arm64/kvm/hyp.S
> @@ -228,199 +228,52 @@
> stp x24, x25, [x3, #160]
> .endm
>
> -.macro save_debug
> - // x2: base address for cpu context
> - // x3: tmp register
> -
> - mrs x26, id_aa64dfr0_el1
> - ubfx x24, x26, #12, #4 // Extract BRPs
> - ubfx x25, x26, #20, #4 // Extract WRPs
> - mov w26, #15
> - sub w24, w26, w24 // How many BPs to skip
> - sub w25, w26, w25 // How many WPs to skip
> -
> - add x3, x2, #CPU_SYSREG_OFFSET(DBGBCR0_EL1)
> -
> - adr x26, 1f
> - add x26, x26, x24, lsl #2
> - br x26
> -1:
> - mrs x20, dbgbcr15_el1
> - mrs x19, dbgbcr14_el1
> - mrs x18, dbgbcr13_el1
> - mrs x17, dbgbcr12_el1
> - mrs x16, dbgbcr11_el1
> - mrs x15, dbgbcr10_el1
> - mrs x14, dbgbcr9_el1
> - mrs x13, dbgbcr8_el1
> - mrs x12, dbgbcr7_el1
> - mrs x11, dbgbcr6_el1
> - mrs x10, dbgbcr5_el1
> - mrs x9, dbgbcr4_el1
> - mrs x8, dbgbcr3_el1
> - mrs x7, dbgbcr2_el1
> - mrs x6, dbgbcr1_el1
> - mrs x5, dbgbcr0_el1
> -
> - adr x26, 1f
> - add x26, x26, x24, lsl #2
> - br x26
> -
> -1:
> - str x20, [x3, #(15 * 8)]
> - str x19, [x3, #(14 * 8)]
> - str x18, [x3, #(13 * 8)]
> - str x17, [x3, #(12 * 8)]
> - str x16, [x3, #(11 * 8)]
> - str x15, [x3, #(10 * 8)]
> - str x14, [x3, #(9 * 8)]
> - str x13, [x3, #(8 * 8)]
> - str x12, [x3, #(7 * 8)]
> - str x11, [x3, #(6 * 8)]
> - str x10, [x3, #(5 * 8)]
> - str x9, [x3, #(4 * 8)]
> - str x8, [x3, #(3 * 8)]
> - str x7, [x3, #(2 * 8)]
> - str x6, [x3, #(1 * 8)]
> - str x5, [x3, #(0 * 8)]
> -
> - add x3, x2, #CPU_SYSREG_OFFSET(DBGBVR0_EL1)
> -
> - adr x26, 1f
> - add x26, x26, x24, lsl #2
> - br x26
> +.macro save_debug_registers type
> + // x4: pointer to register set
> + // x5: number of registers to copy

looking at the caller, you're actually passing the number of registers
to skip?

> + // x6..x22 trashed
> +
> + adr x22, 1f
> + add x22, x22, x5, lsl #2
> + br x22
> 1:
> - mrs x20, dbgbvr15_el1
> - mrs x19, dbgbvr14_el1
> - mrs x18, dbgbvr13_el1
> - mrs x17, dbgbvr12_el1
> - mrs x16, dbgbvr11_el1
> - mrs x15, dbgbvr10_el1
> - mrs x14, dbgbvr9_el1
> - mrs x13, dbgbvr8_el1
> - mrs x12, dbgbvr7_el1
> - mrs x11, dbgbvr6_el1
> - mrs x10, dbgbvr5_el1
> - mrs x9, dbgbvr4_el1
> - mrs x8, dbgbvr3_el1
> - mrs x7, dbgbvr2_el1
> - mrs x6, dbgbvr1_el1
> - mrs x5, dbgbvr0_el1
> -
> - adr x26, 1f
> - add x26, x26, x24, lsl #2
> - br x26
> -
> -1:
> - str x20, [x3, #(15 * 8)]
> - str x19, [x3, #(14 * 8)]
> - str x18, [x3, #(13 * 8)]
> - str x17, [x3, #(12 * 8)]
> - str x16, [x3, #(11 * 8)]
> - str x15, [x3, #(10 * 8)]
> - str x14, [x3, #(9 * 8)]
> - str x13, [x3, #(8 * 8)]
> - str x12, [x3, #(7 * 8)]
> - str x11, [x3, #(6 * 8)]
> - str x10, [x3, #(5 * 8)]
> - str x9, [x3, #(4 * 8)]
> - str x8, [x3, #(3 * 8)]
> - str x7, [x3, #(2 * 8)]
> - str x6, [x3, #(1 * 8)]
> - str x5, [x3, #(0 * 8)]
> -
> - add x3, x2, #CPU_SYSREG_OFFSET(DBGWCR0_EL1)
> -
> - adr x26, 1f
> - add x26, x26, x25, lsl #2
> - br x26
> -1:
> - mrs x20, dbgwcr15_el1
> - mrs x19, dbgwcr14_el1
> - mrs x18, dbgwcr13_el1
> - mrs x17, dbgwcr12_el1
> - mrs x16, dbgwcr11_el1
> - mrs x15, dbgwcr10_el1
> - mrs x14, dbgwcr9_el1
> - mrs x13, dbgwcr8_el1
> - mrs x12, dbgwcr7_el1
> - mrs x11, dbgwcr6_el1
> - mrs x10, dbgwcr5_el1
> - mrs x9, dbgwcr4_el1
> - mrs x8, dbgwcr3_el1
> - mrs x7, dbgwcr2_el1
> - mrs x6, dbgwcr1_el1
> - mrs x5, dbgwcr0_el1
> -
> - adr x26, 1f
> - add x26, x26, x25, lsl #2
> - br x26
> -
> + mrs x21, \type\()15_el1
> + mrs x20, \type\()14_el1
> + mrs x19, \type\()13_el1
> + mrs x18, \type\()12_el1
> + mrs x17, \type\()11_el1
> + mrs x16, \type\()10_el1
> + mrs x15, \type\()9_el1
> + mrs x14, \type\()8_el1
> + mrs x13, \type\()7_el1
> + mrs x12, \type\()6_el1
> + mrs x11, \type\()5_el1
> + mrs x10, \type\()4_el1
> + mrs x9, \type\()3_el1
> + mrs x8, \type\()2_el1
> + mrs x7, \type\()1_el1
> + mrs x6, \type\()0_el1
> +
> + adr x22, 1f
> + add x22, x22, x5, lsl #2
> + br x22
> 1:
> - str x20, [x3, #(15 * 8)]
> - str x19, [x3, #(14 * 8)]
> - str x18, [x3, #(13 * 8)]
> - str x17, [x3, #(12 * 8)]
> - str x16, [x3, #(11 * 8)]
> - str x15, [x3, #(10 * 8)]
> - str x14, [x3, #(9 * 8)]
> - str x13, [x3, #(8 * 8)]
> - str x12, [x3, #(7 * 8)]
> - str x11, [x3, #(6 * 8)]
> - str x10, [x3, #(5 * 8)]
> - str x9, [x3, #(4 * 8)]
> - str x8, [x3, #(3 * 8)]
> - str x7, [x3, #(2 * 8)]
> - str x6, [x3, #(1 * 8)]
> - str x5, [x3, #(0 * 8)]
> -
> - add x3, x2, #CPU_SYSREG_OFFSET(DBGWVR0_EL1)
> -
> - adr x26, 1f
> - add x26, x26, x25, lsl #2
> - br x26
> -1:
> - mrs x20, dbgwvr15_el1
> - mrs x19, dbgwvr14_el1
> - mrs x18, dbgwvr13_el1
> - mrs x17, dbgwvr12_el1
> - mrs x16, dbgwvr11_el1
> - mrs x15, dbgwvr10_el1
> - mrs x14, dbgwvr9_el1
> - mrs x13, dbgwvr8_el1
> - mrs x12, dbgwvr7_el1
> - mrs x11, dbgwvr6_el1
> - mrs x10, dbgwvr5_el1
> - mrs x9, dbgwvr4_el1
> - mrs x8, dbgwvr3_el1
> - mrs x7, dbgwvr2_el1
> - mrs x6, dbgwvr1_el1
> - mrs x5, dbgwvr0_el1
> -
> - adr x26, 1f
> - add x26, x26, x25, lsl #2
> - br x26
> -
> -1:
> - str x20, [x3, #(15 * 8)]
> - str x19, [x3, #(14 * 8)]
> - str x18, [x3, #(13 * 8)]
> - str x17, [x3, #(12 * 8)]
> - str x16, [x3, #(11 * 8)]
> - str x15, [x3, #(10 * 8)]
> - str x14, [x3, #(9 * 8)]
> - str x13, [x3, #(8 * 8)]
> - str x12, [x3, #(7 * 8)]
> - str x11, [x3, #(6 * 8)]
> - str x10, [x3, #(5 * 8)]
> - str x9, [x3, #(4 * 8)]
> - str x8, [x3, #(3 * 8)]
> - str x7, [x3, #(2 * 8)]
> - str x6, [x3, #(1 * 8)]
> - str x5, [x3, #(0 * 8)]
> -
> - mrs x21, mdccint_el1
> - str x21, [x2, #CPU_SYSREG_OFFSET(MDCCINT_EL1)]
> + str x21, [x4, #(15 * 8)]
> + str x20, [x4, #(14 * 8)]
> + str x19, [x4, #(13 * 8)]
> + str x18, [x4, #(12 * 8)]
> + str x17, [x4, #(11 * 8)]
> + str x16, [x4, #(10 * 8)]
> + str x15, [x4, #(9 * 8)]
> + str x14, [x4, #(8 * 8)]
> + str x13, [x4, #(7 * 8)]
> + str x12, [x4, #(6 * 8)]
> + str x11, [x4, #(5 * 8)]
> + str x10, [x4, #(4 * 8)]
> + str x9, [x4, #(3 * 8)]
> + str x8, [x4, #(2 * 8)]
> + str x7, [x4, #(1 * 8)]
> + str x6, [x4, #(0 * 8)]
> .endm
>
> .macro restore_sysregs
> @@ -465,195 +318,52 @@
> msr mdscr_el1, x25
> .endm
>
> -.macro restore_debug
> - // x2: base address for cpu context
> - // x3: tmp register
> -
> - mrs x26, id_aa64dfr0_el1
> - ubfx x24, x26, #12, #4 // Extract BRPs
> - ubfx x25, x26, #20, #4 // Extract WRPs
> - mov w26, #15
> - sub w24, w26, w24 // How many BPs to skip
> - sub w25, w26, w25 // How many WPs to skip
> -
> - add x3, x2, #CPU_SYSREG_OFFSET(DBGBCR0_EL1)
> +.macro setup_debug_registers type

why introduce a new naming scheme and not just stick to
restore_debug_registers?

the way all this code is written it's:
save: read stuff from HW and *save* it in memory
restore: *restore* stuff from memory and write it to HW

> + // x4: pointer to register set
> + // x5: number of registers to copy

ditto: skip/copy

> + // x6..x22 trashed
>
> - adr x26, 1f
> - add x26, x26, x24, lsl #2
> - br x26
> -1:
> - ldr x20, [x3, #(15 * 8)]
> - ldr x19, [x3, #(14 * 8)]
> - ldr x18, [x3, #(13 * 8)]
> - ldr x17, [x3, #(12 * 8)]
> - ldr x16, [x3, #(11 * 8)]
> - ldr x15, [x3, #(10 * 8)]
> - ldr x14, [x3, #(9 * 8)]
> - ldr x13, [x3, #(8 * 8)]
> - ldr x12, [x3, #(7 * 8)]
> - ldr x11, [x3, #(6 * 8)]
> - ldr x10, [x3, #(5 * 8)]
> - ldr x9, [x3, #(4 * 8)]
> - ldr x8, [x3, #(3 * 8)]
> - ldr x7, [x3, #(2 * 8)]
> - ldr x6, [x3, #(1 * 8)]
> - ldr x5, [x3, #(0 * 8)]
> -
> - adr x26, 1f
> - add x26, x26, x24, lsl #2
> - br x26
> + adr x22, 1f
> + add x22, x22, x5, lsl #2
> + br x22
> 1:
> - msr dbgbcr15_el1, x20
> - msr dbgbcr14_el1, x19
> - msr dbgbcr13_el1, x18
> - msr dbgbcr12_el1, x17
> - msr dbgbcr11_el1, x16
> - msr dbgbcr10_el1, x15
> - msr dbgbcr9_el1, x14
> - msr dbgbcr8_el1, x13
> - msr dbgbcr7_el1, x12
> - msr dbgbcr6_el1, x11
> - msr dbgbcr5_el1, x10
> - msr dbgbcr4_el1, x9
> - msr dbgbcr3_el1, x8
> - msr dbgbcr2_el1, x7
> - msr dbgbcr1_el1, x6
> - msr dbgbcr0_el1, x5
> -
> - add x3, x2, #CPU_SYSREG_OFFSET(DBGBVR0_EL1)
> -
> - adr x26, 1f
> - add x26, x26, x24, lsl #2
> - br x26
> + ldr x21, [x4, #(15 * 8)]
> + ldr x20, [x4, #(14 * 8)]
> + ldr x19, [x4, #(13 * 8)]
> + ldr x18, [x4, #(12 * 8)]
> + ldr x17, [x4, #(11 * 8)]
> + ldr x16, [x4, #(10 * 8)]
> + ldr x15, [x4, #(9 * 8)]
> + ldr x14, [x4, #(8 * 8)]
> + ldr x13, [x4, #(7 * 8)]
> + ldr x12, [x4, #(6 * 8)]
> + ldr x11, [x4, #(5 * 8)]
> + ldr x10, [x4, #(4 * 8)]
> + ldr x9, [x4, #(3 * 8)]
> + ldr x8, [x4, #(2 * 8)]
> + ldr x7, [x4, #(1 * 8)]
> + ldr x6, [x4, #(0 * 8)]
> +
> + adr x22, 1f
> + add x22, x22, x5, lsl #2
> + br x22
> 1:
> - ldr x20, [x3, #(15 * 8)]
> - ldr x19, [x3, #(14 * 8)]
> - ldr x18, [x3, #(13 * 8)]
> - ldr x17, [x3, #(12 * 8)]
> - ldr x16, [x3, #(11 * 8)]
> - ldr x15, [x3, #(10 * 8)]
> - ldr x14, [x3, #(9 * 8)]
> - ldr x13, [x3, #(8 * 8)]
> - ldr x12, [x3, #(7 * 8)]
> - ldr x11, [x3, #(6 * 8)]
> - ldr x10, [x3, #(5 * 8)]
> - ldr x9, [x3, #(4 * 8)]
> - ldr x8, [x3, #(3 * 8)]
> - ldr x7, [x3, #(2 * 8)]
> - ldr x6, [x3, #(1 * 8)]
> - ldr x5, [x3, #(0 * 8)]
> -
> - adr x26, 1f
> - add x26, x26, x24, lsl #2
> - br x26
> -1:
> - msr dbgbvr15_el1, x20
> - msr dbgbvr14_el1, x19
> - msr dbgbvr13_el1, x18
> - msr dbgbvr12_el1, x17
> - msr dbgbvr11_el1, x16
> - msr dbgbvr10_el1, x15
> - msr dbgbvr9_el1, x14
> - msr dbgbvr8_el1, x13
> - msr dbgbvr7_el1, x12
> - msr dbgbvr6_el1, x11
> - msr dbgbvr5_el1, x10
> - msr dbgbvr4_el1, x9
> - msr dbgbvr3_el1, x8
> - msr dbgbvr2_el1, x7
> - msr dbgbvr1_el1, x6
> - msr dbgbvr0_el1, x5
> -
> - add x3, x2, #CPU_SYSREG_OFFSET(DBGWCR0_EL1)
> -
> - adr x26, 1f
> - add x26, x26, x25, lsl #2
> - br x26
> -1:
> - ldr x20, [x3, #(15 * 8)]
> - ldr x19, [x3, #(14 * 8)]
> - ldr x18, [x3, #(13 * 8)]
> - ldr x17, [x3, #(12 * 8)]
> - ldr x16, [x3, #(11 * 8)]
> - ldr x15, [x3, #(10 * 8)]
> - ldr x14, [x3, #(9 * 8)]
> - ldr x13, [x3, #(8 * 8)]
> - ldr x12, [x3, #(7 * 8)]
> - ldr x11, [x3, #(6 * 8)]
> - ldr x10, [x3, #(5 * 8)]
> - ldr x9, [x3, #(4 * 8)]
> - ldr x8, [x3, #(3 * 8)]
> - ldr x7, [x3, #(2 * 8)]
> - ldr x6, [x3, #(1 * 8)]
> - ldr x5, [x3, #(0 * 8)]
> -
> - adr x26, 1f
> - add x26, x26, x25, lsl #2
> - br x26
> -1:
> - msr dbgwcr15_el1, x20
> - msr dbgwcr14_el1, x19
> - msr dbgwcr13_el1, x18
> - msr dbgwcr12_el1, x17
> - msr dbgwcr11_el1, x16
> - msr dbgwcr10_el1, x15
> - msr dbgwcr9_el1, x14
> - msr dbgwcr8_el1, x13
> - msr dbgwcr7_el1, x12
> - msr dbgwcr6_el1, x11
> - msr dbgwcr5_el1, x10
> - msr dbgwcr4_el1, x9
> - msr dbgwcr3_el1, x8
> - msr dbgwcr2_el1, x7
> - msr dbgwcr1_el1, x6
> - msr dbgwcr0_el1, x5
> -
> - add x3, x2, #CPU_SYSREG_OFFSET(DBGWVR0_EL1)
> -
> - adr x26, 1f
> - add x26, x26, x25, lsl #2
> - br x26
> -1:
> - ldr x20, [x3, #(15 * 8)]
> - ldr x19, [x3, #(14 * 8)]
> - ldr x18, [x3, #(13 * 8)]
> - ldr x17, [x3, #(12 * 8)]
> - ldr x16, [x3, #(11 * 8)]
> - ldr x15, [x3, #(10 * 8)]
> - ldr x14, [x3, #(9 * 8)]
> - ldr x13, [x3, #(8 * 8)]
> - ldr x12, [x3, #(7 * 8)]
> - ldr x11, [x3, #(6 * 8)]
> - ldr x10, [x3, #(5 * 8)]
> - ldr x9, [x3, #(4 * 8)]
> - ldr x8, [x3, #(3 * 8)]
> - ldr x7, [x3, #(2 * 8)]
> - ldr x6, [x3, #(1 * 8)]
> - ldr x5, [x3, #(0 * 8)]
> -
> - adr x26, 1f
> - add x26, x26, x25, lsl #2
> - br x26
> -1:
> - msr dbgwvr15_el1, x20
> - msr dbgwvr14_el1, x19
> - msr dbgwvr13_el1, x18
> - msr dbgwvr12_el1, x17
> - msr dbgwvr11_el1, x16
> - msr dbgwvr10_el1, x15
> - msr dbgwvr9_el1, x14
> - msr dbgwvr8_el1, x13
> - msr dbgwvr7_el1, x12
> - msr dbgwvr6_el1, x11
> - msr dbgwvr5_el1, x10
> - msr dbgwvr4_el1, x9
> - msr dbgwvr3_el1, x8
> - msr dbgwvr2_el1, x7
> - msr dbgwvr1_el1, x6
> - msr dbgwvr0_el1, x5
> -
> - ldr x21, [x2, #CPU_SYSREG_OFFSET(MDCCINT_EL1)]
> - msr mdccint_el1, x21
> + msr \type\()15_el1, x21
> + msr \type\()14_el1, x20
> + msr \type\()13_el1, x19
> + msr \type\()12_el1, x18
> + msr \type\()11_el1, x17
> + msr \type\()10_el1, x16
> + msr \type\()9_el1, x15
> + msr \type\()8_el1, x14
> + msr \type\()7_el1, x13
> + msr \type\()6_el1, x12
> + msr \type\()5_el1, x11
> + msr \type\()4_el1, x10
> + msr \type\()3_el1, x9
> + msr \type\()2_el1, x8
> + msr \type\()1_el1, x7
> + msr \type\()0_el1, x6
> .endm
>
> .macro skip_32bit_state tmp, target
> @@ -887,12 +597,65 @@ __restore_sysregs:
> restore_sysregs
> ret
>
> +/* Save debug state */
> __save_debug:
> - save_debug
> + // x0: base address for vcpu context

why do we need the vcpu context here?

> + // x2: ptr to current CPU context

what does 'current' mean here?

> + // x3: ptr to debug registers
> + // x4/x5: trashed

you're also trashing everything that save_debug_registers is...

> +
> + mrs x26, id_aa64dfr0_el1
> + ubfx x24, x26, #12, #4 // Extract BRPs
> + ubfx x25, x26, #20, #4 // Extract WRPs
> + mov w26, #15
> + sub w24, w26, w24 // How many BPs to skip
> + sub w25, w26, w25 // How many WPs to skip
> +
> + mov x5, x24
> + add x4, x3, #DEBUG_BCR
> + save_debug_registers dbgbcr
> + add x4, x3, #DEBUG_BVR
> + save_debug_registers dbgbvr
> +
> + mov x5, x25
> + add x4, x3, #DEBUG_WCR
> + save_debug_registers dbgwcr
> + add x4, x3, #DEBUG_WVR
> + save_debug_registers dbgwvr
> +
> + mrs x21, mdccint_el1
> + str x21, [x2, #CPU_SYSREG_OFFSET(MDCCINT_EL1)]
> ret
>
> +/* Restore debug state */
> __restore_debug:
> - restore_debug
> + // x0: base address for cpu context

same as above (also not here you say cpu context, above you say vcpu
context, this is confusing)

> + // x2: ptr to current CPU context

same question with 'current' ?

> + // x3: ptr to debug registers
> + // x4/x5: trashed

same trash, you probably want to specify x4..x22 (note that you're
explicitly also touching x21 below).

> +
> + mrs x26, id_aa64dfr0_el1
> + ubfx x24, x26, #12, #4 // Extract BRPs
> + ubfx x25, x26, #20, #4 // Extract WRPs
> + mov w26, #15
> + sub w24, w26, w24 // How many BPs to skip
> + sub w25, w26, w25 // How many WPs to skip
> +
> + mov x5, x24
> + add x4, x3, #DEBUG_BCR
> + setup_debug_registers dbgbcr
> + add x4, x3, #DEBUG_BVR
> + setup_debug_registers dbgbvr
> +
> + mov x5, x25
> + add x4, x3, #DEBUG_WCR
> + setup_debug_registers dbgwcr
> + add x4, x3, #DEBUG_WVR
> + setup_debug_registers dbgwvr
> +
> + ldr x21, [x2, #CPU_SYSREG_OFFSET(MDCCINT_EL1)]
> + msr mdccint_el1, x21
> +
> ret
>
> __save_fpsimd:
> @@ -927,6 +690,7 @@ ENTRY(__kvm_vcpu_run)
> bl __save_sysregs
>
> compute_debug_state 1f
> + add x3, x2, #CPU_SYSREG_OFFSET(DBGBCR0_EL1)
> bl __save_debug
> 1:
> activate_traps
> @@ -942,6 +706,7 @@ ENTRY(__kvm_vcpu_run)
> bl __restore_fpsimd
>
> skip_debug_state x3, 1f
> + add x3, x2, #CPU_SYSREG_OFFSET(DBGBCR0_EL1)

why is this sysreg cpu offset the debug registers that you can apply
offsets of kvm_guest_debug_arch to?

> bl __restore_debug
> 1:
> restore_guest_32bit_state
> @@ -962,6 +727,7 @@ __kvm_vcpu_return:
> bl __save_sysregs
>
> skip_debug_state x3, 1f
> + add x3, x2, #CPU_SYSREG_OFFSET(DBGBCR0_EL1)
> bl __save_debug
> 1:
> save_guest_32bit_state
> @@ -984,6 +750,7 @@ __kvm_vcpu_return:
> // already been saved. Note that we nuke the whole 64bit word.
> // If we ever add more flags, we'll have to be more careful...
> str xzr, [x0, #VCPU_DEBUG_FLAGS]
> + add x3, x2, #CPU_SYSREG_OFFSET(DBGBCR0_EL1)
> bl __restore_debug
> 1:
> restore_host_regs
> --
> 2.3.5
>

Thanks,
-Christoffer


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